How Do I Detail Heat-Sheet Correctly in Order to Eliminate the Layer of Poly?

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How Do I Detail Heat-Sheet Correctly in Order to Eliminate the Layer of Poly?

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A popular feature of Heat-Sheet is that it can eliminate the need for a layer of poly/vapor barrier.

However, some builders are hesitant to skip this step. How should a Heat-Sheet installation be detailed to properly eliminate the poly?

First, if you need to protect against radon, you will still need the layer of poly/vapor barrier.

Otherwise, to eliminate the layer of poly under Heat-sheet:

  • Your layer of Heat-Sheet needs to be R10 or thicker and needs to meet or exceed a compressive strength of 25 psi (is Type 3 and Type IX EPS), and
  • You will need to seal the perimeter of Heat-Sheet layer to footing or the wall and apply vapor barrier tape over any cracks or broken lap joints.
Insulated Concrete Forms and Heat-Sheet Vapor Barrier Detail
Insulated Concrete Forms and Heat-Sheet Vapor Barrier Detail