Author |
Message |
Phil Kabza Senior Member Username: phil_kabza
Post Number: 176 Registered: 12-2002
| Posted on Sunday, May 28, 2006 - 10:44 pm: | |
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: | |
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: | |
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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