Vapor-Retarding Membranes for Back-Up Walls Visalia CA

Applying a rubberized asphalt membrane over the surface of the concrete masonry would make a more effective vapor-retarding membrane than would an application of an asphaltic paint in Visalia.

Sing R Masonry
(559) 635-9040
3020 W Packwood Ct
Visalia, CA
 
Elite Surfaces
(559) 733-1107
602 S Bridge St
Visalia, CA
 
Professional Chimney Service & Stove Sales
(559) 732-6200
4345 W Whitendale Ave
Visalia, CA
 
Newlin E
(559) 635-1553
317 N Cottonwood St
Visalia, CA
 
Ds Masonry
(559) 739-8080
2723 W Clinton Ct
Visalia, CA
 
Johns Country Chimney Sweep
(559) 627-9855
4309 W Hemlock Ct
Visalia, CA
 
First Class Masonry & Concrete Pumping
(559) 781-8820
304 N Leggett St
Visalia, CA
 
Colwell Richard Masonry
(559) 733-4154
1626 W Linden Ave
Visalia, CA
 
Kucala Ron Masonry
(559) 732-7446
648 W Princeton Ct
Visalia, CA
 
Royce Nalls Masonry
(559) 733-8559
29715 Road 158
Visalia, CA
 

Vapor-Retarding Membranes for Back-Up Walls

Provided By:

Source: MASONRY CONSTRUCTION MAGAZINE
Publication date: November 1, 1999

I have heard people recommending asphalt coatings for the exterior face of the concrete masonry back-up wall in cavity wall construction to act as a vapor-retarding membrane. This is particularly true with an exterior wythe of glazed brick. If the intent is to create a vapor-retarding membrane on the surface of the block, wouldn't it be better to use an impervious sheet membrane, such as rubberized asphalt? The surface of the concrete masonry is typically very rough, and an asphalt coating would typically contain pinholes.

Applying a rubberized asphalt membrane over the surface of the concrete masonry would make a more effective vapor-retarding membrane than would an application of an asphaltic paint. However, before applying any coating, you must ask yourself whether this is the proper place for a vapor-retarding membrane. A vapor-retarding membrane should be on the warm side of the insulation. Therefore, over a large portion of the United States, the heating season dictates that the vapor barrier be on the interior side of the insulation. For insulated cavity walls, this would be the exterior surface of the concrete masonry backup wythe. However, when insulation is not placed in the cavity, it would typically be either within the cells of the masonry backup or on the interior surface of the concrete masonry.

Click here to read full article from Masonry Construction