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RE: Repair Detail of Moisture Retarder

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The most qualified people for moisture retarder repair are roofers. If it is a true moisture retarder, you will have to seal the laps. Generally you would lap the 2 membranes and seal them with something similar to 2 beads of a urethane sealant or adhesive tape. You should try to determine the manufacturer of the moisture retarder so that the new material and the adhesive will be compatible.

Re: ASTM E-1643

Here are some excerpts from specs. for vapor retarder:

3. Place underslab vapor retarder with longest dimension parallel with direction of pour, lapping seams 6 inches and sealing with manufacturer?s recommended adhesive or pressure sensitive tape. 4. Seal around penetrations through vapor retarder, such as utilities, to create a monolithic membrane between the surface of the slab and the subgrade. Repair damaged vapor retarder prior to placement of concrete. 5. Where vapor retarder is interrupted at interior or edge footings, lap vapor retarder 6 inches minimum over footing. Where embedment cannot be achieved, lap 2 inches minimum and seal vapor retarder to footing with a continuous bead of manufacturer's recommended adhesive. 6. Repair vapor retarder damaged during placement of reinforcement or concrete with patch of vapor retarder material. Lap beyond edges of damaged area a minimum of 6-inches and seal edges as prescribed for seams.

A. Vapor Retarder: Place, protect, and repair vapor-retarder sheets according to ASTM E 1643 and manufacturer's written instructions.

For details see the following:

If this is not enough, let me know. I have a lot more stuff on moisture retarders.

Harold Sprague

From: "Bill Allen" <T.W.Allen(--nospam--at)>
Reply-To: <seaint(--nospam--at)>
To: <seaint(--nospam--at)>
Subject: Repair Detail of Moisture Retarder
Date: Sat, 26 Aug 2006 09:53:29 -0700

I'm designing a structure which requires a new pad footing located within an
existing slab.

How should I instruct repair of the vapor retarder?

Turn down the edge of the existing membrane and tuck the new membrane up
behind it (on the vertical face of the cut) for some specified distance?

Seal the two membranes? If so, how and with what material?

A detail would be cool, but that would be beyond my expectations.


T. William (Bill) Allen, S.E.


Consulting Structural Engineers
 V (949) 248-8588 . F(949) 209-2509

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