||Do It Right the First Time with ASTM D 6622
Beneath the decks of parking garages or city plazas are expansive
waterproofing membranes. When improperly installed, extensive
excavation for repairs incurs a heavy toll on building owners.
Sound guidance for the application of hot-applied waterproofing
systems is provided in ASTM D 6622, Standard Guide for Application of Fully Adhered Hot-Applied
Reinforced Waterproofing Systems. New in March, it includes material
basics and installation techniques for:
Built-up coal tar pitch and asphalt;
SBS plies (Styrene-butadiene-styrene modified asphalt); and
Polymer-modified (rubberized) asphalt.
It is a single resource for a wide range of products, said James
C. Strong, Wiss Janney Elstner Associates, Inc., Emeryville, Calif.,
who chaired the ASTM group that developed the guide. Generally,
there is an unacceptable rate of failure in waterproofing systems,
said Strong, a senior construction specialist with 20 years experience
in roofing and waterproofing technology. The price of failure
is very high. Once topping slabs or landscaping is installed,
its very difficult to locate a leak, so you end up tearing out
large areas that are quite expensive to remove and replace.
Hot-applied waterproofing beneath low-slope (plaza deck) surfaces
are typically finished with stone pavers, concrete slabs, planters,
and trees. Beneath the finished surface, the waterproofing membrane
protects interior spaces below and structural materials from water
When it does fail, its very problematic because its so expensive
for owners to fix, noted Strong. Because theyre buried, essentially
there is no way to maintain them. What gets installed needs to
work and keep working for a very long time.
Strong drafted the standard in 1977 with a small resource group
in Subcommittee D08.22 on Waterproofing and Dampproofing Systems.
Subsequent drafts were reviewed by members of ASTM Committee D08 on Roofing, Waterproofing, and Bituminous Materials, who represent
a cross-section of consultants, manufacturers, contractors, trade
institutions and government agencies. Canadian standards for rubberized
asphalt were incorporated into D 6622 at the suggestion of D08
members who work in Canada.
A 1985 companion document on the design of built-up waterproofing,
ASTM C 981, Standard Guide for Design of Built-Up Bituminous Membrane Waterproofing
Systems for Building Decks is being revised by Subcommittee C24.80
on Building Deck Waterproofing Systems, part of Committee C24 on Building Seals and Sealants.
For further technical information, contact James C. Strong, Wiss Janney Elstner Associates, Inc., Emeryville, Calif. (phone:
510/428-2907). Committee D08 meets Dec. 2-5 in Dallas, Texas.
For meeting or membership details, contact Staff Manager Pat Picariello, ASTM (phone: 610/ 832-9720). //
Copyright 2001, ASTM