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Vapor-Retarding Membranes for Back-Up Walls Chico 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 Chico.

Vinci Masonry
(925) 755-8780
3200 Stroer Ln
Antioch, CA
 
Guenther Masonry
(714) 539-8691
10142 Brookside Dr
Garden Grove, CA
 
Dahl'S Painting
(310) 375-3469
115 Nevada Street
Torrance, CA
 
Caple Bros Construction Co
(626) 791-1303
52 E Orange Grove Blvd
Pasadena, CA
 
Earl K Powers Construction
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678 Enterprise St
Escondido, CA
 
Ajb Construction
(909) 262-3232
15455 Crimson St
Fontana, CA
 
Mike Rogers Masonry
(530) 644-5026
2120 Oak Leaf Ct
Stockton, CA
 
Paradigm Concrete And Masonry Inc
(925) 755-4940
PO Box 482
Antioch, CA
 
Bill Harris Quality Stucco
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1700 Space Park Dr
Santa Clara, CA
 
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18838 Vista Del Canon Unit G
Newhall, CA
 

Vapor-Retarding Membranes for Back-Up Walls

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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.

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