Vapor-Retarding Membranes for Back-Up Walls Syracuse NY

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 Syracuse.

Heritage Masonry Restoration
(315) 423-9889
421 Burnet Ave
Syracuse, NY
 
La Face Tile & Mason Co Inc
(315) 371-6964
414 Butternut St
Syracuse, NY
 
Viau Constr Corp
(315) 472-0171
785 Erie Blvd W
Syracuse, NY
 
D P Building Co
(315) 395-8608
3650 James St Ste 211
Syracuse, NY
 
Schneid Construction
(315) 479-9004
210 6th St
Syracuse, NY
 
Hopkins & Reilly Mason Contractors Inc
(315) 474-0161
419 Hiawatha Blvd E
Syracuse, NY
 
Pls Construction Co
(315) 876-0978
213 Grand Ave #1
Syracuse, NY
 
Tersal Construction
(315) 476-6762
109 Factory Ave
Syracuse, NY
 
Lari Construction Limited
(315) 701-0444
2572 Erie Blvd E Ste 2
Syracuse, NY
 
Expert Chimney
(315) 469-5004
4800 Mcdonald Rd Ste 1
Syracuse, NY
 

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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