Duradek (Duradek U.S. Inc.) is a
sheet vinyl membrane similar to Hypalon but with a nonskid
wear surface. It was developed over 25 years ago for
waterproofing decks, balconies, and outdoor living spaces.
For use over a living space, the manufacturer recommends
its 60-mil Ultra series, which is warranted against leakage
for 10 years.
Duradek is made of reinforced PVC sheet with heat
stabilizers and additives for resistance to fire, UV degradation,
and mildew. The wear surface is textured for slip
resistance and available in a variety of colors.
Installation Tips for Walk-On Roofs
Installation is similar to other single plies
and must be done by factory-certified contractors. The
membrane glues to almost any clean substrate with either
a proprietary contact cement or a special water-based
adhesive applied with a notched trowel.
Seams are heat
welded with a heat gun, the most critical step. Like other
single-ply membranes, the material is self-flashing at abutting
walls and penetrations.
Pros and Cons of Duradek Walkable Roofing Membranes
Duradek creates an attractive and
durable no-skid deck surface that can withstand
normal wear and tear, direct sun exposure, high winds, and
freeze-thaw cycles. However, because the membrane is
also the wear surface, it can be damaged by cigarette
burns, punctures, and heavy abrasion.
Other Examples of Walk-on Roof Surfaces Using Pavers, Boards, Plank Walkways
At above left is an example of an awkward roof hatch access onto a walk-on low-slope roofing.
Access is necessary for HVAC system maintenance, roof drain maintenance, etc. Notice also the black roofing mastic patching around the rooftop HVAC ductwork - I expect there have been leaks into the duct system and possible mold contamination therein.
At above right is an on-roof service stair on a low slope roof at the Castle Point New York Veterans Administration health facility. Notice that raised curbs have been placed at mechanicals and at the stair bottom. See the photo at below left for details.
Below is an older walk-on roof surface: painted canvas nailed on a walk-out balcony roof in Newburgh, New York. Well, ok, it used to be a walk-on roof surface. At this inspection the canvas was worn, missing in some areas, and the roof was of course leaking.
Shown below is the painted-canvas surface of a pre-1900 walk-on roof-balcony surface on the same building as illustrated above.
Below is a walk-on roof balcony from another 19th century New York building that was covered in interlocking copper shingles soldered together.
How about a "drive-on" roof surface. Below we illustrate the roof of a home along the Hudson River in New York.
And below is a New York City rooftop deck constructed over a flat membrane roof surface.
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(Feb 3, 2014) joe mama said:
thanks for the help.
Question: walk-on roof be surfaced with recycled plastic boards
(June 27, 2014) Metje Butler said:
Could a walk-on roof be surfaced with recycled plastic boards and be water-tight ?
You'd need a waterproof membrane below the boards
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Mark Cramer Inspection Services Mark Cramer, Tampa Florida, Mr. Cramer is a past president of ASHI, the American Society of Home Inspectors and is a Florida home inspector and home inspection educator. Mr. Cramer serves on the ASHI Home Inspection Standards. Contact Mark Cramer at: 727-595-4211 mark@BestTampaInspector.com
John Cranor is an ASHI member and a home inspector (The House Whisperer) is located in Glen Allen, VA 23060. He is also a contributor to InspectApedia.com in several technical areas such as plumbing and appliances (dryer vents). Contact Mr. Cranor at 804-747-7747 or by Email: firstname.lastname@example.org
"Choosing Roofing," Jefferson Kolle, January 1995, No. 92, Fine Homebuilding, Taunton Press, 63 S. Main St., PO Box 5506, Newton CT 06470 - 800-888-8286 - see http://www.taunton.com/FineHomebuilding/ for the magazine's website and for subscription information.
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
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.)
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).
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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