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Phil Kabza
Senior Member
Username: phil_kabza

Post Number: 176
Registered: 12-2002
Posted on Sunday, May 28, 2006 - 10:44 pm:   Edit PostDelete PostPrint Post

Mr. Metzger's comments are to the point. The wall/roof/parapet interface is a notorious thermal and moisture bridge, because it is hard to properly extend vapor barriers and insulation through this juncture. Applying SPF on the back of a parapet wall cuts off the best path for moisture to breathe out of the wall system at that point. Instead, it will find its way out somewhere else - like through your brick, bringing efflouresence with it, or by condensing and finding its way back into the building.

Try and find a solution that allows the back of the parapet wall to vent moisture to the exterior. Rainscreen metal panels are frequently used with success. SPF is often too good a vapor barrier for such a location.
Mario J. Ibanez, CSI, CDT
Intermediate Member
Username: mariojibanez

Post Number: 4
Registered: 06-2005
Posted on Wednesday, May 31, 2006 - 06:46 pm:   Edit PostDelete PostPrint Post

Yes, most PUF coating are a high solids acrylic which is an "elastomeric waterproof coating" and compatible with typical wall paint, some PUF roofs are also covered with silicone and urethane coatings.

Coating manufacturers that I know off that sell their products for walls are;
Thermo Mfg.
Topcoat by GAF
Ronald L. Geren, RA, CSI, CCS, CCCA, MAI
Senior Member
Username: specman

Post Number: 270
Registered: 03-2003
Posted on Wednesday, May 31, 2006 - 07:03 pm:   Edit PostDelete PostPrint Post

However, for foam roofs, the acrylic coating is not for waterproofing, but for protecting the urethane foam from UV degredation. The urethane foam is actually the waterproof membrane AND the thermal insulation.

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