R-Guard Installation Detail

Pipe or Mechanical Penetrations

metal studs with gypsum sheathing/OSB sheathing/plywood

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Mechanically secure loose penetrations at the interior of the wall before detailing. Install non-gassing polyethylene foam backer rod backed by spray foam around electrical fixtures, conduit or plumbing to form a back dam.


Apply FastFlash or Joint & Seam Filler around the wall penetration at a minimum thickness of 12 mils (FastFlash) or 20 mils (Joint & seam Filler). Use a dry trowel or spatula to tool and seal the joint. Create a joint profile that directs bulk water away from the opening.



Provide a minimum 1" overlap of FastFlash or Joint & Seam Filler with the selected PROSOCO primary air and water resistive barrier.

Ted Barnekoff - Air & Water Barriers, PROSOCO

Ted Barnekoff
Product Support - Air & Water Barriers


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