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

Pengilly Masonry Inc
(209) 467-7722
747 Wilshire Ave
Stockton, CA
 
Advanced Engineering Service
(209) 952-7926
10774 Savoy Cir
Stockton, CA
 
Copperfield Chimney Supply
(209) 941-2900
1505 Tillie Lewis Dr
Stockton, CA
 
Copperfield Chimney
(209) 941-2929
1953 Madrid Dr
Stockton, CA
 
Greer Stucco
(209) 286-1433
8349 Lafayette St
Stockton, CA
 
Old World Chimney Sweep
(209) 951-2832
8441 Edgefield Way
Stockton, CA
 
Saiers Masonry
(209) 320-1080
7500 West Ln
Stockton, CA
 
E & J Plastering
(209) 465-4027
3992 Howard Rd
Stockton, CA
 
Design Masonry Group
(209) 466-6646
4500 E Fremont St
Stockton, CA
 
Mike Rogers Masonry
(530) 644-5026
2120 Oak Leaf Ct
Stockton, 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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