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

Free Lance Masonry
(714) 373-2272
15432 Hanover Ln
Huntington Beach, CA
 
Evans & Son Masonry
(925) 778-3887
904 Barmouth Ct
Antioch, CA
 
Elk Grove Granite
(916) 714-7887
9914 Kent St
Elk Grove, CA
 
Carlton Construction
(661) 947-9618
40209 12th St W
Palmdale, CA
 
Carranza Masonry Construction
(909) 626-8898
1932 Russell Pl
Pomona, CA
 
Screen Guys
(707) 399-7692
2101 Mecca Ct
Fairfield, CA
 
Advanced Constructors Corp
(714) 848-3204
16892 Gothard St Ste D
Huntington Beach, CA
 
Chimney Sweep Bill
(818) 248-2035
2806 Paraiso Way
Glendale, CA
 
Bulls Eye Pressure Washing
(818) 780-8605
14739 1/2 Oxnard St
Van Nuys, CA
 
A California Exteriors Co
(909) 883-5398
3260 N E St
San Bernardino, 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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