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More Information

Snow curls around and hangs down from a standing seam metal roof that has no snow guards - Poughkeepsie (C) 2013 Daniel Friedman Snow Retention Systems: Snow Guards for Metal, Slate & Tile Roofs
     

  • Photographs of installation of snow guards on slate roofs, on metal roofs, on rubber roofs
  • Guide to all types of snow retention systems: snow guards, snow guard shoes, snow loops, snow brakes, snow rails, snow fences used on various roofs & roof slopes
  • Installation specifications for snow brakes & snow guards on roofs
  • How to attach snow retention systems, snow guards, bars, brakes, to the roof
  • Sources to buy snow guards, snow brakes, snow guard clamps, adhesives, mounts
  • SLATE ROOF SOURCES & TOOLS - separate article
  • Questions & Answers about the need for snow guards & snow brakes on roofs, how snow guards are installed, & snow guard spacing intervals on roofs
  • References

Click to Show or Hide Related Topics

  • ROOFING INSPECTION & REPAIR - roofing home page
  • SLATE ROOF INSPECTION & REPAIR - home
  • SLATE ROOF COLORS & SLATE ROOF COLORS & SLATE CHEMISTRY
  • SLATE ROOF DEFECTS
    • SLATE ROOF CONDITION, OTHER FACTORS
    • SLATE ROOF INSTALLATION QUALITY
    • SLATE ROOF LEAKS
  • SLATE ROOF INSPECTION COURSE
  • SLATE ROOF LIFE EXPECTANCY
  • SLATE ROOF PATTERNS
  • SLATE ROOF PHOTO LIBRARY
  • SLATE ROOF REPAIRS
    • SLATE ROOF LEAKS, TEMPORARY REPAIR
    • SLATE ROOF REPAIR, WORN OUT
    • SLATE ROOF REPAIRS, HISTORY OF
    • SLATE ROOF REPAIR REFERENCES
    • SLATE ROOF SOURCES & TOOLS
  • SLATE ROOFS, STEEP SLOPE
  • SLATE ROOF TYPES
    • SLATE ROOF TYPES, RIBBON SLATES
    • SLATE ROOF PHOTO LIBRARY
  • SNOW GUARDS & SNOW BRAKES
InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.

Snow retention systems guide to roof snow guards & snow fences & their installation methods.This article illustrates types of snow guards or snow brakes or other snow retention devices used on metal, rubber, asphalt, and slate roofs and we explain and illustrate in photographs just how and where these devices are attached to building roofs. We give the reasons for snow & ice retainer use and their history. We also describe the hazards and damage risks to roofs, gutters, and items on the ground (shrubs, people, vehicles) below roof eaves in snow country where snow guards are omitted. We list product sources: where to buy snow guards and snow & ice retention systems & components.

Green links show where you are. © Copyright 2013 InspectAPedia.com, All Rights Reserved. Author Daniel Friedman.

A Guide to Snow Retention Systems: Snow Brakes and Snow & Ice Guards on Roofs - selection, mounting, maintenance, product sources

What is a snow retention device? What are "Snow Guards" - do they also hold ice?

Copper snow guards Vassar Campus (C) Daniel FriedmanSnow retention systems is a generic term used for a wide range of devices placed on roofs to prevent snow and ice from sliding down and falling off the roof - an event that is dangerous to people below and that can damage buildings and building components.

The types of snow retention systems can be described by the snow retainer physical shape or design (one manufacturer provides an abrasive roof coating), but keep in mind that there is also a variety of methods of attaching the snow retainer device itself to the roof surface. In this article we describe all of the different types of snow retention devices, their attachment methods, and their advantages and risks.

Snow Brakes or Snow Guards on Metal Roofs

Metal roof snow brakes - Bard College (C) Daniel FriedmanSnow brakes, or snow guards are used on metal roofs covering buildings in snow-prone areas. Our photo (left) shows snow guards on a modern computing center building on the Bard College campus, Annandale, NY.

  • Snow guards are installed as a safety measure to avoid clobbering someone entering or exiting the building at a bad moment. At a New York property we watched as a huge curl of snow and ice fell off of a metal roof onto a vehicle parked close to the building, smashing the car's hood.
  • Snow guards are installed to avoid knocking gutters off of the structure. Properly placing gutters so that the outermost gutter edge is at or below the extended roof slope plane can help prevent ice or snow from knocking gutters off, though in heavy snow areas we often see that homeowners have given up on the idea of keeping gutters on a metal-roofed home, using other means to direct roof runoff away from the building.
  • Snow guards are installed to avoid piles of snow on entrance steps and platforms
  • Snow guards are installed to avoid damage to lower roofs. For example, heavy loads of snow and ice suddenly falling from an upper roof slope on to a lower standing seam metal roof may bend or damage the standing seams, and snow or ice falling from an upper to a lower slate or tile roof could break slates or tiles on the lower surface.
  • Snow guards are also installed to avoid damage to shrubs or other landscaping or to protect mechanical systems such as air conditioning compressor/condenser equipment located beneath the building eaves

Snow sliding off of a metal roof (C) 2013 Daniel FriedmanOur photo at left illustrates how snow creeps outwards from the roof edge in a shelf formation when no snow retention system is installed on a building. Eventually the snow extending out from this roof falls onto a lower roof at this building (see photo at page top), with a resounding whoomph that shakes the walls. Snow guards are needed here.

Snow guards and a bit of their history are discussed in NPS "From Asbestos to Zinc" from which we quote:

Snow guards or snow brakes, as they are sometimes called, began appearing on slate and metal roofs of New England in the late 1800s.

The tremendous quantities of snow and ice that accumulated on these roofs made the wood or metal diverter, typically attached above the front entry, an ineffective tool in preventing the snow from sliding down the roof.

With snow guards in place, the snow would eventually blow away or remain until it melted. Not only was the risk of damage to objects and persons below avoided, but the banking of snow and ice at the eaves was prevented, thus eliminating the chances of backwater and consequent leaks, as well as a straining of the gutter structure.

Copper snow guards Vassar Campus (C) Daniel Friedman

 

This photo of snow brakes on a standing seam metal roof demonstrates that snow guards or snow hooks were widely used on metal roofs for more than 100 years.

At SLATE ROOF HARDWARE we show more snow brakes and guards used on slate roofs. Also see SLATE ROOF INSPECTION & REPAIR and see our metal roofing home page, METAL ROOFING.

 

Photographs of Slate Roof Snow Guards & Snow Brakes or Snow Hooks

Below we include our own photographs of snow brakes, snow guards, snow hooks, and other on-roof devices to control against snow damage and hazards, including snow guard examples and similar roof snow brakes & materials from the 1800's up to 2012.

Snow guards

While in general snow retention systems use the terms "snow guard" and "snow brake" or even "snow bracket" and "snow hook" interchangeably, for clarity we call the long horizontal device shown on a slate roof at left a "snow brake" or "snow fence" or "snow bar" while we refer to individual, non-linear devices attached to the roof surface as snow guards.

Snow Brake or "Snow Bar" shown at left on a slate roof

 


Snow guard on a slate roof

 

Snow Guard Hooks, and heat tapes - suspect ice dam leaks or ice falling at building entry

 


Snow guards or hooks on slate roof

Wire Loop snow "hooks" are snow retainers that are made using a heavy gauge wire instead of flat metal or plastic protrusions show in other photos in this article.

Snow Hooks, the wire loops shown in our photo at left were installed during the slate roof installation by nailing the wire loop's supporting base to the roof deck between the side butt joints of slates.

 

 


Copper snow guards Vassar Campus (C) Daniel Friedman

 

Here are new copper snow guards being installed on a slate roof that was also being replaced/repaired on the Wimpfheimer Nursery building on the Vassar College Campus, Poughkeepsie, NY - March 2010.


Traditional metal snow guards on slate roof (C) Daniel Friedman
  • Traditional structurally-secured slate roof snow guards include a nailed bracket that is covered by upper or succeeding courses of slates (photo at left), and are installed during roof installation.

    To retrofit snow guards to a slate roof it may be necessary to remove and reinstall some slates to avoid drilling through slates or trying to glue a snow guard to an older, weathered surface.

Metal Roof Snow Retention Systems

Snow guards on metal roof (C) Daniel Friedman
  • Metal roof snow guards are often installed by gluing the snow guard to the metal roof surface in the center of pans between the standing seams. [2]

    Our photo (left) illustrates a plethora of snow guards fastened to a metal roof on the Vassar College Campus. It appears that the maintenance department has tried a variety of products on this roof, with mixed success.

Our second photo (below left) shows the same building roof in January 2013, with partial snow cover. You can see these snow guards at work as they prevent snow and ice on the upper roof slope from sliding down and falling off at the roof eaves.


Snow guards at work on a metal roof, Vassar College (C) 2013 Daniel FriedmanHow to Install Snow Guards on a Metal Roof

Because of the problem of poor adhesion of the snow guard to the roof that later come loose or creep down the metal roof, manufacturers offer tips for a successful installation including:

  • Clean the metal roof surface in the area where the snow guard is to be glued. We use isopropyl alcohol which has not, in our experience, ever harmed the roof's finish surface. Some other solvents such as acetone are not recommended as they will dissolve paint or other coloration on the roof, while other recommended solvents such as xylene may work well but can be highly toxic and thus more dangerous to handle.
  • Read the instructions from the manufacturer regarding how the snow guard adhesive should be applied - how much, at what temperatures, with how much runout at the edges of the snow guard. (Leaving no run-out may look better but it asks for snow and ice push that ultimately loosens the snow guard.
  • Snow guard adhesive often needs up to four weeks to cure, longer if temperatures are below 50 degF. During the curing process the snow guards may creep down a hot roof. Use string or other support clamped across the roof to hold the snow guards in place until the adhesive is fully cured.

Snow guards on a metal roof (C) Daniel Friedman

Here are metal snow guards clamped to the steams of a standing seam metal roof. These snow guards are not installed following the recommendations of some manufacturers who suggest their guards be glued to the pans centered between the standing seams.

We like this implementation: snow guards are clamped directly to the standing seam on the roof - no holes are made in the metal roof surface, and we avoid the problem of snow guard creep: glued snow-guards that creep down or fail to adhere to the roof surface. These snow guards look like and probably are the painted cast aluminum RT SNow Guards produced by Berger Building Products[1].

We spoke with the occupants of this building in Poughkeepsie, New York about their experience with this installation. The staff confirmed that in eight years of winter snow collecting on the roof, this snow retention system had functioned without fail - important because customers park their cars quite close to the eaves of this building.


Snow guards

  • Metal roofs using long horizontal snow bars or snow brakes (photo at left) have these snow retention systems installed using clamps on individual standing seams.

    The metal roof shown at left sports both a metal roof snow fence and clear plastic individual snow guards installed four in each metal roof pan - clearly the maintenance crew were having trouble retaining the snow on this roof. Snow retention on this roof was extra important to protect a bevy of HVAC equipment located just under the roof eaves.
  • Corrugated metal roofs also accept snow guards, typically made of bronze or galvanized iron and referred to as a Snow Guard Shoe.[1]
  • Slate roofs (photo shown earlier in this article) using long horizontal snow brakes mount the brake or fence on brackets nailed to the roof, with the nailed portion of the mounting bracket extending up under succeeding courses of slates to avoid risk of leaks around mounting bolts.

Snow Retention Device Installation Specifications for Spacing

Snow Guard Spacing Distances

Snow hooks or guards Justin Morrill Smith House (C) Daniel FriedmanExperts point out that for the placement of individual snow guards (as opposed to long horizontal snow fences or snow brakes) depends on the pitch of the roof. According to Precision Snow-Guards[2]

  • For roofs sloped 0 (flat) to 2 inches in 12 of rise (2/12 Slope), snow guards are placed in one staggered set across the lower roof edge staggered two feet on center. [Why you would need snow retention guards on a flat or 0-slope roof escapes us - Ed.]
  • For roofs sloped more than 2/12 and up to 6/12, install two rows or sets of staggered guards, two feet on center
  • For roofs sloped at 6/12 and steeper, install two rows or sets of snow guards in straight lines (not staggered) across the roof eaves
  • For metal loop wire type snow hooks or snow guards (photo at left) you can see that to work at all, since these devices have much less surface area than a flat or bar type snow guard, they have to be installed in many staggered rows over half or more of the roof surface. The snow hooks shown here are installed on a slate roof at the Justin Morrill Smith historic home in Vermont. Metal loop snow guards for shingle,slate, and cedar shake roofs are typically made of copper wire. See Berger Building Products for a source.[1]
  • Snow brakes, snow fences, snow rails, or similarly-called continuous bars or fences to retain snow on a building roof are usually installed as a single continuous system across the roof eaves, typically 1 to 3 feet above the eaves.

5 Snow Retention System or Snow Guard Installation Mounting Methods

Snow rail or fence on a tile roof in Norway (C) Daniel FriedmanIndividual snow guard mounting methods vary depending on the roof covering material. All snow retention systems use one of these methods to provide snow and ice retention for building roofs.

Our photo (left) illustrates structurally-mounted snow brakes or rails on a tile roof covering the Oslo Folk Museum. As Norway experiences heavy snow fall, you will observe that the snow brakes are installed in two tiers and a close examination shows that the rail brackets are secured to the roof structure below.

  1. Structurally-connected snow retainer mounts: A snow retention device or its mounting bracket is fastened through the roof surface to the underlying roof sheathing or framing structure. For steel roofs the retainer mount may be welded to the roof surface.

    For slate, tile, or shingle roofs, the leak risk of this approach can be minimal as the fasteners can be covered by subsequent courses of roofing material. For metal roofs we prefer not to puncture the metal roof surface. Structurally-connected snow & ice guard system mounts should be used where the loads (weight) of snow and ice are very great such as on large roofs or in deep-snow areas, or where the snow rail is itself large and heavy.

    Watch out: depending on the total loads imposed by snow and ice on a roof, failures are still possible with structurally connected snow retainer systems if the screws, bolts, or their connection points are not adequately designed & installed on the roof.
  2. Clamp-on snow retainer mounts: for standing seam metal roofs, various patented clamps secure to the raised rib portion of the standing seam and in turn provide a base for mounting snow shoes, snow guards, or snow rails or fences.

    The clamp mounting method for mounting snow guards & fences is also quite strong and has the advantage of avoiding penetrations of the roof surface. Of course clamps mount on standing seams of metal roofs, not other roof surface shapes. However the weight of snow and ice trying to slide down the roof - the load - is carried by the roof covering, and is transferred to the roof structure only by the metal roof mounting clamps beneath the roof surface.

    Watch out: metal roof manufacturers warn that because snow guards mounted on the standing seam of a metal roof transfer load to the metal roof covering, good roof installation will be sure during roof installation to locate metal roof mounting clamps at a location and spacing to be sure that the metal roof is well-secured to the roof deck below areas where a snow retention system may be mounted. Otherwise loads on the roof can bend or damage the metal roofing.

  3. Adhesive bonded snow guards on glass roof Rhinebeck NY (C) Daniel Friedman
  4. Adhesive-bonded snow retainer mounts: a snow guard or supporting mount for a more extensive snow retainer system is glued to the surface of a metal, glass, or plastic roof surface. [See photo at left showing glued-on snow guards on a glass roof at a bank drive-through structure in Rhinebeck, NY]

    Watch out: Most snow retention system failures occur with glued-on snow guards that were not properly bonded to the roof surface.

    Depending on the care of installation and other factors, some contractors report having difficulty keeping glued mounts in place, observing them sliding down the roof before the glue has cured or dislodging from the roof surface entirely later-on.[5] Note that most snow retention system product manufacturers warrant their system if it is installed according to their specifications.

  5. Clip-on snow retainers: Atas and others offer clips that mount to the horizontal rail of a snow or ice retaining fence or rail, providing an additional degree of snow and ice retention on roofs. On a metal roof one or at most two clips are mounted in the space between the standing seams. [5][6]
  6. Snow-retention coating: for metal roofs, SnowGrip[10] offers a patented abrasive-based snow-retention coating for metal roofing. The entire roof surface is coated with an abrasive material.

Is there a Snow Retention System Building Code?

Short answer: no.

A snow and ice retention system that mounts to a standing seam metal roof by connecting to the roof covering has to resist the forces of snow and ice pressure by transmitting those forces from the snow fence or snow guard to the roof surface and through that roof to the roof mounting clips. There are building codes for building roof system wind-uplift resistance on metal roofs but there are not building codes that describe the "shear strength" resistance for the fasteners used to secure metal roof panels to the roof deck.

Failures in the mounting system for snow retention devices can occur if the snow retention system is not adequately secured to the building structure itself. Damage to the roof or roof covering can also occur if the total snow and ice load bends or breaks the roof covering (such as a standing seam metal roof).

If the total load causes the roof mounting clips beneath the metal roof to shear. In our OPINION given the total number of clips used to secure the length of a standing seam metal roof panel to the roof deck below, the chances of shearing of all of these roof mounting clip screws, properly screwed to a sound plywood or even OSB roof deck should be minimal. However it is plausible that high snow and ice loading near the roof edge, imposed against snow guards or a snow fence in that location, could provide a bending force that pulls fasteners out of the roof deck, bending or damaging the roof, and sending snow guards and snow and ice to the ground below.

Adhesive failures are reported by Galow, Anderson, and others as a common snow retention system failure for glued-on snow guards on metal roofs, as we discussed above. [15][20]

Where to Buy Snow & Ice Retention Systems: Snow Brakes, Snow Guards, Snow Hooks, Snow & Ice Fences

  • [1] Berger Snow Retention Systems, Berger Building Products, 805 Pennsylvania Blvd. Feasterville, PA 19053 Toll-free: 800-523-8852805, Email: info@bergerbuildingproducts.com, Website: BergerBuildingProducts.com
    See: http://www.bergerbuildingproducts.com/pdfs/catalog_snowguards.pdf
  • [2] Precision Snow-Guards, AceClamp®, Standing Seam Metal Roof Supplies, Precision Snow-guards™ - c/o PMC Industries, Inc. 87 Spring Lane, Plainville, CT 06062 Tel: (860) 229-SNOW (7669) provides clear or colored plastic snow guards for metal and rubber roofs, available in "King" and "Queen" sizes. Tel: (860) 229-SNOW (7669). Website: http://www.snow-guards.com/snowguards.php
  • [3] S-5!® Snow Retention Systems, S-5! Attachment Solutions, Metal Roof Innovations, LTD. 8655 Table Butte Road Colorado Springs, CO 80908 (888) 825-3432, Email: info@s-5.com, Website: http://www.s-5.com/snow/

    The company's products include milled solid block aluminum snow rail mounting clamps of varying shapes & designs. We are evaluating the S-5! clamps provided by this company. These clamps attach to the standing seams on a metal roof and in turn are used to attach a snow rail or snow fence. The company also provides solar panel hold-downs for metal roofs.- Ed.
  • [4] SnoBar™, Tel: 800-711-9724, Website: http://www.snobar.com/index.html The company's products include a patented one-piece roof clamp bracket & other brackets for attaching bars used as snow rails or snow fences. No street address was provided.
  • [5] Alpine SnowGuards® 289 Harrel Street Morrisville, VT 05661 Tel: 888-766-9994, Email: info@alpinesnowguards.com Website: http://www.alpinesnowguards.com/ [No direct retail sales]
  • [6] ATAS Snow Retention Products, ATAS Headquarters Allentown, Pennsylvania 18106 Phone: 800-468-1441 FAX: 610-395-9342 Email: info@atas.com, Website: http://www.atas.com/Company/Contact.aspx
  • [7] Pacific Sheet Metal, Aspen Office & Shop, 401 Aspen Airport Business Center Aspen, Colorado 81611, Email: sales@pacificsheetmetal.net, Tel: 970.925.2454. The company provides a line of very sturdy snow rails or fences that mount to the seams of a metal roof.
  • [8] Gough Snow Guards, Brookfield IL, Tel: 708-485-6272, Website: http://www.snoguard.com/ The company's products include copper snow guards installed on slate roofs and tile roofs, as well as standing seam metal roof snow retention systems.
  • [9] AMSI Supply 4333 Lynwood Ct, Douglasville, GA 30134, metal roofing components, Tel: 800-943-9771
  • [10] SnowGrip, 126 Woodward Ave., Iron Mountain, MI  49801, Tel: 06-396-7000, Email: mark@snowgripit.com Website: http://www.snowgripit.com/
  • [11] BRB Metal Roofing & Manufacturing, 1726 North Green Ave., Suite 900 Purcell, OK 73080 P.O. Box 506 Purcell, OK 73080, Tel: 877-272-7663, distributes the SnowBoss™ mechanically attached snow retention system for metal roofs

Metal Roofing Sources & Products

  • Classic Products www.classicroof.com Modular metal shingle panels and standing seam panels
  • Decra Roofing Systems www.decra.com Modular metal shingle, tile, and shake panels
  • Dura-Lok Roofing Systems www.duraloc.com Modular metal roofing shingles with granular coating
  • Fabral www.fabral.com Exposed fastener and concealed clip metal roofing panels
  • Gerard Roofing Technologies www.gerardusa.com Modular metal shake and tile panels with granular coating
  • Met-Tile www.met-tile.com Modular metal roof-tile panels
  • Atas International www.atas.com Modular metal shingle, tile, and standing-seam panels
  • Custom-Bilt Metals www.custombiltmetals.com Modular metal shakes and standing seam panels
  • Zappone Manufacturing, website www.zappone.com/
    Zappone Manufacturing, 2928 North Pittsburg St. Spokane, WA 99207 1-800-285-2677, Washington State Copper Roofing Supplier of Copper scallop shingles, copper shingles, copper bay windows, vertical walls, aluminum roof shingles

Roof Venting Underlayments

Benjamin Obdyke www.benjaminobdyke.com Cedar Breather, a 3/8 -in.-thick matrix-type underlayment designed to provide ventilation and drainage space under wood roofing

More Information about Roofing Materials, Methods, Standards

Asphalt Roofing Manufacturers Association (ARMA) www.asphaltroofing.org

Cedar Shake and Shingle Bureau www.cedarbureau.org

Metal Roofing Alliance www.metalroofing.com

Tile Roofing Institute www.tileroofing.org


Frequently Asked Questions (FAQs)

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Questions & answers or comments about the need for snow guards & snow brakes on roofs, how snow guards are installed, & snow guard spacing intervals on roofs.

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Technical Reviewers & References

Related Topics, found near the top of this page suggest articles closely related to this one.

  • [1] Berger Snow Retention Systems, Berger Building Products, 805 Pennsylvania Blvd. Feasterville, PA 19053 Toll-free: 800-523-8852805, Email: info@bergerbuildingproducts.com, Website: BergerBuildingProducts.com
    See: http://www.bergerbuildingproducts.com/pdfs/catalog_snowguards.pdf
  • [2] Precision Snow-Guards, AceClamp®, Standing Seam Metal Roof Supplies, Precision Snow-guards™ - c/o PMC Industries, Inc. 87 Spring Lane, Plainville, CT 06062 Tel: (860) 229-SNOW (7669) provides clear or colored plastic snow guards for metal and rubber roofs, available in "King" and "Queen" sizes. Tel: (860) 229-SNOW (7669). Website: http://www.snow-guards.com/snowguards.php
  • [3] S-5!® Snow Retention Systems, S-5! Attachment Solutions, Metal Roof Innovations, LTD. 8655 Table Butte Road Colorado Springs, CO 80908 (888) 825-3432, Email: info@s-5.com, Website: http://www.s-5.com/snow/

    The company's products include milled solid block aluminum snow rail mounting clamps of varying shapes & designs. We are evaluating the S-5! clamps provided by this company. These clamps attach to the standing seams on a metal roof and in turn are used to attach a snow rail or snow fence. The company also provides solar panel hold-downs for metal roofs.- Ed.
  • [4] SnoBar™, Tel: 800-711-9724, Website: http://www.snobar.com/index.html The company's products include a patented one-piece roof clamp bracket & other brackets for attaching bars used as snow rails or snow fences. No street address was provided.
  • [5] Alpine SnowGuards® 289 Harrel Street Morrisville, VT 05661 Tel: 888-766-9994, Email: info@alpinesnowguards.com Website: http://www.alpinesnowguards.com/ [No direct retail sales]
  • [6] ATAS Snow Retention Products, ATAS Headquarters Allentown, Pennsylvania 18106 Phone: 800-468-1441 FAX: 610-395-9342 Email: info@atas.com, Website: http://www.atas.com/Company/Contact.aspx
  • [7] Pacific Sheet Metal, Aspen Office & Shop, 401 Aspen Airport Business Center Aspen, Colorado 81611, Email: sales@pacificsheetmetal.net, Tel: 970.925.2454. The company provides a line of very sturdy snow rails or fences that mount to the seams of a metal roof.
  • [8] Gough Snow Guards, Brookfield IL, Tel: 708-485-6272, Website: http://www.snoguard.com/ The company's products include copper snow guards installed on slate roofs and tile roofs, as well as standing seam metal roof snow retention systems.
  • [9] AMSI Supply 4333 Lynwood Ct, Douglasville, GA 30134, metal roofing components, Tel: 800-943-9771
  • [10] SnowGrip, 126 Woodward Ave., Iron Mountain, MI  49801, Tel: 06-396-7000, Email: mark@snowgripit.com Website: http://www.snowgripit.com/
  • [11] ARMA - Asphalt Roofing Manufacturer's Association - http://www.asphaltroofing.org/
    750 National Press Building, 529 14th Street, NW, Washington, DC 20045, Tel: 202 / 207-0917
  • ASTM - ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA, 19428-2959 USA The ASTM standards listed below can be purchased in fulltext directly from http://www.astm.org/
  • [12] Cedar Shake & Shingle Bureau, CSSB, U.S.: Sumas, WA 98295-1178, Tel: 604-820-7700, In Canada: Cedar Shake and Shingle Bureau #2 - 7101 Horne Street, Mission, BC V2V 7A2 Tel: (604) 820-7700, E-mail: info@cedarbureau.com , website: http://www.cedarbureau.org/
  • [13] Forest Products Laboratory, US FPL, One Gifford Pinchot Drive, Madison, WI 53726, Tel: (608) 231-9200, Email: mailroom_forest_products_laboratory@fs.fed.us608-231-9200, website: http://www.fpl.fs.fed.us/
  • [14] NRCA - National Roofing Contractors Association - http://www.nrca.net/, 10255 W. Higgins Road, Suite 600, Rosemont, IL 60018-5607, Tel: (847) 299-9070
  • [15] Eric Galow, Galow Homes, Lagrangeville, NY. Mr. Galow can be reached by email: ericgalow@gmail.com or by telephone: 914-474-6613. Mr. Galow specializes in residential construction including both new homes and repairs, renovations, and additions.
  • [16] UL - Underwriters Laboratories - http://www.ul.com/
    2600 N.W. Lake Rd.
    Camas, WA 98607-8542
    Tel: 1.877.854.3577 / Fax: 1.360.817.6278 E-mail: cec.us@us.ul.com
  • [17] "From Asbestos to Zinc, Gutters", Technical Preservation Services, National Park Service, U.S. Department of the Interior, web search 9./29.10, original source: http://www.nps.gov/history/hps/tps/roofingexhibit/gutters.htm
  • [18] Best Practices Guide to Residential Construction, by Steven Bliss. John Wiley & Sons, 2006. ISBN-10: 0471648361, ISBN-13: 978-0471648369, Hardcover: 320 pages, available from Amazon.com and also Wiley.com. See our book review of this publication
  • [19] Asphalt Roofing Residential Manual,
  • [20] Terry Anderson, "Snow Retention - the Invisible Code", web search 7/13/12, original source: http://snow.tra-mage.com/news-articles/snow-retention-the-invisible-code.html [copy on file as: Anderson Dec 2011 Interface.pdf ]
  • Building Pathology, Deterioration, Diagnostics, and Intervention, Samuel Y. Harris, P.E., AIA, Esq., ISBN 0-471-33172-4, John Wiley & Sons, 2001 [General building science-DF] ISBN-10: 0471331724 ISBN-13: 978-0471331728
  • Building Pathology: Principles and Practice, David Watt, Wiley-Blackwell; 2 edition (March 7, 2008) ISBN-10: 1405161035 ISBN-13: 978-1405161039
  • Built-Up Roof Systems, Manual, C.W. Griffin, Mcgraw-Hill (Tx); 2nd edition (July 1982), ISBN-10: 0070247838, ISBN-13: 978-0070247833
  • Concrete Folded Plate Roofs, C. Wilby PhD BSc CEng FICE FIStructE (Author), Butterworth-Heinemann, 1998, ISBN-10: 0340662662, ISBN-13: 978-0340662663
  • Concrete Shell Roofs, C. Wilby PhD BSc CEng FICE FIStructE (Author),
  • Concrete Dome Roofs (Longman Concrete Design and Construction Series),
  • Concrete Roofing Tile, History of the, Batsford, 1959, AISN B000HLLOUC (available used)
  • Copper Roofing, by CDA
  • Copper Roofing, Master specifications for copper roofing and sheet metal work in building construction: Institutional, commercial, industrial, I.E. Anderson, 1961 (hard to find)
  • Corrugated Iron, Building on the Frontier, Simon Holloway
  • Green Roof Plants: A Resource and Planting Guide, Edmund C. Snodgrass, Lucie L. Snodgrass, Timber Press, Incorporated, 2006, ISBN-10: 0881927872, ISBN-13: 978-0881927870. The text covers moisture needs, heat tolerance, hardiness, bloom color, foliage characteristics, and height of 350 species and cultivars.
  • Green Roof Construction and Maintenance, Kelley Luckett, McGraw-Hill Professional, 2009, ISBN-10: 007160880X, ISBN-13: 978-0071608800, quoting: Key questions to ask at each stage of the green building process Tested tips and techniques for successful structural design Construction methods for new and existing buildings Information on insulation, drainage, detailing, irrigation, and plant selection Details on optimal soil formulation Illustrations featuring various stages of construction Best practices for green roof maintenance A survey of environmental benefits, including evapo-transpiration, storm-water management, habitat restoration, and improvement of air quality Tips on the LEED design and certification process Considerations for assessing return on investment Color photographs of successfully installed green roofs Useful checklists, tables, and charts
  • Handbook of Building Crafts in Conservation, Jack Bower, Ed., Van Nostrand Reinhold Company, NY 1981 ISBN 0-442-2135-3 Library of Congress Catalog Card Nr. 81-50643.
  • Historic Preservation Technology: A Primer, Robert A. Young, Wiley (March 21, 2008) ISBN-10: 0471788368 ISBN-13: 978-0471788362
  • Historic Slate Roofs : With How-to Info and Specifications, Tina Skinner (Ed), Schiffer Publishing, 2008, ISBN-10: 0764330012 , ISBN-13: 978-0764330018
  • Low Slope Roofing, Manual of, 4th Ed., C.W. Griffin, Richard Fricklas, McGraw-Hill Professional; 4 edition, 2006, ISBN-10: 007145828X, ISBN-13: 978-0071458283
    • Roof failure causes in depth (and specific methods for avoiding them)
    • Roof design fundamentals and flourishes, based on voluminous industry research and experience
    • New technologies and materials -- using them safely and correctly
    • Comprehensive coverage of all major roofing systems pecifications, inspection, and maintenance tools for roofing work
  • Metal Roofing, an Illustrated Guide, R.A. Knowlton , [metal shingle roofs],
  • Patio Roofs, how to build, Sunset Books
  • Problems in Roofing Design, B. Harrison McCampbell, Butterworth Heineman, 1991 ISBN 0-7506-9162-X (available used)
  • Roofing The Right Way, Steven Bolt, McGraw-Hill Professional; 3rd Ed (1996), ISBN-10: 0070066507, ISBN-13: 978-0070066502
  • Slate Roofs, National Slate Association, 1926, reprinted 1977 by Vermont Structural Slate Co., Inc., Fair Haven, VT 05743, 802-265-4933/34. (We recommend this book if you can find it. It has gone in and out of print on occasion.)
  • Roof Tiling & Slating, a Practical Guide, Kevin Taylor, Crowood Press (2008), ISBN 978-1847970237,
    If you have never fixed a roof tile or slate before but have wondered how to go about repairing or replacing them, then this is the book for you. Many of the technical books about roof tiling and slating are rather vague and conveniently ignore some of the trickier problems and how they can be resolved. In Roof Tiling and Slating, the author rejects this cautious approach. Kevin Taylor uses both his extensive knowledge of the trade and his ability to explain the subject in easily understandable terms, to demonstrate how to carry out the work safely to a high standard, using tried and tested methods. 
    This clay roof tile guide considers the various types of tiles, slates, and roofing materials on the market as well as their uses, how to estimate the required quantities, and where to buy them. It also discusses how to check and assess a roof and how to identify and rectify problems; describes how to efficiently "set out" roofs from small, simple jobs to larger and more complicated projects, thus making the work quicker, simpler, and neater; examines the correct and the incorrect ways of installing background materials such as underlay, battens, and valley liners; explains how to install interlocking tiles, plain tiles, and artificial and natural slates; covers both modern and traditional methods and skills, including cutting materials by hand without the assistance of power tools; and provides invaluable guidance on repairs and maintenance issues, and highlights common mistakes and how they can be avoided. The author, Kevin Taylor, works for the National Federation of Roofing Contractors as a technical manager presenting technical advice and providing education and training for young roofers.
  • The Slate Roof Bible, Joseph Jenkins, www.jenkinsslate.com, 143 Forest Lane, PO Box 607, Grove City, PA 16127 - 866-641-7141 (We recommend this book).
  • Slate Roofing in Canada (Studi4es in archaeology, architecture, and history),
  • Smart Guide: Roofing: Step-by-Step Projects, Creative Homeowner (Ed), 2004, ISBN-10: 1580111491, ISBN-13: 978-1580111492
  • Solar heating, radiative cooling and thermal movement: Their effects on built-up roofing (United States. National Bureau of Standards. Technical note), William C Cullen, Superintendent of Documents, U.S. Govt. Print. Off (1963), ASIN: B0007FTV2Q
  • Tile Roofs of Alfred: A Clay Tradition in Alfred NY
  • "Weather-Resistive Barriers [copy on file as /interiors/Weather_Resistant_Barriers_DOE.pdf ] - ", how to select and install housewrap and other types of weather resistive barriers, U.S. DOE
  • Wood Shingle Roofs, Care and Maintenance of wood shingle and shake roofs (EC), Stanley S. Niemiec (out of print)

Books & Articles on Building & Environmental Inspection, Testing, Diagnosis, & Repair

  • Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the InspectAPedia Bookstore. Also see our Book Reviews - InspectAPedia.
  • Home Reference Book - Carson DunlopThe Home Reference Book - the Encyclopedia of Homes, Carson Dunlop & Associates, Toronto, Ontario, 25th Ed., 2012, is a bound volume of more than 450 illustrated pages that assist home inspectors and home owners in the inspection and detection of problems on buildings. The text is intended as a reference guide to help building owners operate and maintain their home effectively. Field inspection worksheets are included at the back of the volume. Special Offer: For a 10% discount on any number of copies of the Home Reference Book purchased as a single order. Enter INSPECTAHRB in the order payment page "Promo/Redemption" space. InspectAPedia.com editor Daniel Friedman is a contributing author.

    Or choose the The Home Reference eBook for PCs, Macs, Kindle, iPad, iPhone, or Android Smart Phones. Special Offer: For a 5% discount on any number of copies of the Home Reference eBook purchased as a single order. Enter INSPECTAEHRB in the order payment page "Promo/Redemption" space.
  • Architectural elements: the technological revolution: Galvanized iron roof plates and corrugated sheets; cast iron facades, columns, door and window caps, ... (American historical catalog collection), Diana S Waite, available used out of Amazon.
  • ...

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