I have seen many pictorials depicting the use of rigid foam over exterior sheathing to reduce thermal bridging. However, none of the diagrams show the use of rigid foam with brick or stone venner applications. We plan to build next spring and would like ti incorporate rigid foam with a stone/brick exterior. Any help?
JD
Framing the floor inside a crawlspace foundation keeps a gable-end addition close to grade.
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Replies
I've never done it, but it just seems that you would need longer screws on your Hardibacker / cement board.
The James Hardie website says:
" For floors and walls:
Minimum 1-1/4" long corrosion-resistant roofing nails.
Minimum 1-1/4" long No. 8 x 0.375" HD self-drilling corrosion-resistant ribbed waferhead screws.
If compliance with ANSI A108.11 is not required, minimum 1" long No. 8 x 0.323" HD self-drilling corrosion-resistant ribbed buglehead screws may be used for floors.
If applying HardieBacker® 500 cement board over gypsum, use minimum 1-3/4" long corrosion-resistant roofing nails."
So I would just use 1 3/4 min., but it depends how thick the foam is.