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Site-built SIPs with furring strips.

jeremyhale | Posted in General Questions on

I doing a DIY renovation of a post and beam home in Japan. As the home never had any sheathing, I decided to make what you referred to in another post as “site built” SIPs. I figured it would add some shear strength while adding insulation. 

The site built SIPs are 45 mm (~2”) XPS foam board glued to 12 mm (1/2”) plywood and fastens to the posts with 90 mm (~3-1/2”) screws spaced every 150 mm (6”). The major posts are spaced 3 feet apart with minor posts every 1 foot so I have rows of screws every foot. 

My question is about making a rainscreen with furrings on these SIPs. Should I attach the furrings to the plywood part of the SIP with a narrowly-spaced short screws or use long screws that go through the SIP into the posts but spaced every foot?

Thanks for your time. 

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  1. mark_be | | #1

    If you haven’t already installed your “sips”, use one screw to go through the furring strips and sips into the posts.

  2. Expert Member


    With 1/2" backing you can either use short screws, or a siding nailer that shoots ring-shank nails.

  3. jeremyhale | | #3

    Thanks for the help. Much appreciated.

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