From Western States Roofing Contractors Association comes this technical bulletin on liquid applied membranes to concrete decks. Moisture present in concrete slabs creates numerous problems for liquid membranes. Read how and why and what to do to avoid problems-by testing moisture levels, drying concrete and prepping it properly.
To: Waterproofing Contractor Members Winter 2013
From: WSRCA Waterproofing Technical Committee
Subject: Evaluating Concrete Decks in Preparation for Waterproofing
Membrane Application
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After receiving reports from member contractors describing problems with
waterproofing membranes maintaining adhesion to concrete decks, WSRCA's
Waterproofing Committee has prepared the following Technical Bulletin to
provide basic guidelines for evaluating new and existing concrete decks, prior to
waterproofing.
Factors that can affect short-term and long-term adhesion of waterproofing
systems to concrete decks include the dryness of the deck or actual moisture
content of the concrete, surface profile or finish, and use of curing compounds,
surfacing agents and/or additives in the concrete mix. This bulletin also describes
optional methods of mechanically drying wet or damp concrete decks to facilitate
adhesion of waterproofing materials, and working with the concrete contractor to
prevent an improper surface finish or use of concrete curing compounds and/or
surfacing agents that inhibit drying or are incompatible with the waterproofing
membrane.
CLICK HERE TO READ THE REST http://www.wsrca.com/members-clubhouse-login/pdf/WSRCA_TechnicalBulletin-2013-1w.pdf
Bill Leys-The Deck Expert
NEW PAPERLESS FAX # 805-856-1528 (by Hello Fax)
805-801-2380
www.centralcoastwaterproofing.com Lic 890269
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