Snow Guards for Glass, Plastic or Metal Roofs
How to install snow guards on smooth-surfaced roofs
SNOW GUARDS on METAL ROOFS - CONTENTS: about how to install snow guards on glass, smooth plastic, or metal roofs using a glue-on or clamp-on method. Choices of snow brake systems for smooth-surfaced roofs & how to install them.
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This article describes snow retention systems for smooth-surfaced roofs such as glass roofs, plastic roofs and metal roofs. We describe both glue-on snow guards and the types of clamp-on snow fences for these roof systems. Details include the glue-on snow guard installation steps, advice about using special adhesives, adhesive curing time & adhesive runout & tooling.
This article series 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.
Metal or other smooth-surfaced roof snow guards are often installed by gluing the snow guard to the metal, glass or plastic roof surface in the center of pans between the standing seams. Berger and also SureBond both note that there it may be possible to install successful adhesive applications on other roof surfaces as well. 
[Click to enlarge any image]
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.
Glue-Down Snow Guards for Glass, Plastic or Metal Roofs
Excerpts are below. We agree with opinions encountered among roofers that it's better to glue snow guards to a metal roof (or use device that clamp to the standing seam) for two reasons:
Leaks: Even though some snow guards are sold with pre-drilled holes for mechanical fastening of the retaining device to the roof surface, every nail or screw is another hole in the roof, and another potential leak.
Thermal damage: Mechanically bonding a flat-bottomed snow guard to a metal roof may result in roof damage, tearing, leaks, connector hole elongation during wide temperature swings on the roof.
Thermal expansion differences between the snow guard itself and the metal roof surface may be substantial. Superbond's SB-190, in contrast, can tolerate significant thermal change without damage.
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
buying the proper quantity of snow guards,
using the proper adhesive,
cleaning the roof surface, and
making sure that weather conditions are right before trying to glue these snow brake devices onto the roof surface.
Step by step details for installing clamp-on -type snow brakes or guards on metal, glass, or smooth plastic roofs that include standing seams or similar ridges that serve as a mounting point are at SNOW GUARD CLAMP ON INSTALLATION.
Excerpts are below.
Two types of clamp-on snow brakes & guards are widely used on standing seam metal roofs: individual snow guards that clamp to the roof seam (below left) or horizontal snow brakes that use multiple clamps across the roof surface (below right). Some of these systems can also be adapted for plastic, glass or other smooth surfaced roofs if there are suitable mounting points in the roof structure.
At above left 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, but this is a quick and easy installation approach.
Metal roofs using long horizontal snow bars or snow brakes (photo at above right) have these snow retention systems installed using clamps on individual standing seams.
Can these snow guard methods be used on other types of roofs? Yes.
Corrugated metal roofs also accept snow guards, typically made of bronze or galvanized iron and referred to as a Snow Guard Shoe.
Slate roofs (photos shown earlier in this article series) 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.
Watch out: What happens if you defer installing snow guards on a roof where they're needed? Take a look at SNOW GUARD FAILURES and at PLUMBING VENT REPAIR and you can see both damage and how that damage was later repaired.
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 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
 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: email@example.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.
 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.
 Alpine SnowGuards®
289 Harrel Street
Morrisville, VT 05661 Tel: 888-766-9994, Email: firstname.lastname@example.org Website: http://www.alpinesnowguards.com/ [No direct retail sales]
 ATAS Snow Retention Products, ATAS Headquarters
Allentown, Pennsylvania 18106
Email: email@example.com, Website: http://www.atas.com/Company/Contact.aspx
 Pacific Sheet Metal,
Aspen Office & Shop,
401 Aspen Airport Business Center Aspen, Colorado 81611, Email: firstname.lastname@example.org, 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.
 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.
 AMSI Supply 4333 Lynwood Ct, Douglasville, GA 30134, metal roofing components, Tel: 800-943-9771
 SnowGrip, 126 Woodward Ave.,
Iron Mountain, MI 49801, Tel: 06-396-7000, Email: email@example.com Website: http://www.snowgripit.com/
 Eric Galow, Galow Homes, Lagrangeville, NY. Mr. Galow can be reached by email: firstname.lastname@example.org or by telephone: 914-474-6613. Mr. Galow specializes in residential construction including both new homes and repairs, renovations, and additions.
 "From Asbestos to Zinc, Gutters", Technical Preservation Services, National Park Service, U.S. Department of the Interior, web search 9./29.10, original source:
 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 ]
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.)
Carson, Dunlop & Associates Ltd., 120 Carlton Street Suite 407, Toronto ON M5A 4K2. Tel: (416) 964-9415 1-800-268-7070 Email: email@example.com. The firm provides professional home inspection services & home inspection education & publications. Alan Carson is a past president of ASHI, the American Society of Home Inspectors. Thanks to Alan Carson and Bob Dunlop, for permission for InspectAPedia to use text excerpts from The Home Reference Book & illustrations from The Illustrated Home. Carson Dunlop Associates' provides extensive home inspection education and report writing material.
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