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Application of foam panels

K4qQQJiwf3 | Posted in Green Products and Materials on

My company is about to start a retro-fit project…My main concern is, How to keep the panels of foam with 5/8 osb, with strapping and Hardy plank siding from, “sliding straight down” from all of the weight of the whole “system”…It seems that, with a 6” headlock screw, the weight of the system would pull it down or at least sag…The specs for the foam board only covers roofing applications. NOT WALLS….Any Ideas???

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  1. Foamer | | #1


    The engineers at Building Science Corp have done testing on this. The friction is tremendous and everything will stay in place just fine. (I assume you are installing foam outside of OSB with furring strips). I remember Joe Lstiburek commenting that you could hang a pick-up truck off the furring strip and nothing would move.

    If you want documentation, you can search the BSC website.

  2. GBA Editor
    Martin Holladay | | #2

    Better yet, you can search the GBA website -- or just click this link, where all your questions will be answered: Fastening Furring Strips to a Foam-Sheathed Wall.

    Engineers have already made these calculations, so you don't have to re-invent the wheel. Just read the screw spacing from the table.

  3. davidmeiland | | #3

    Jay, are you talking about installing nailbase panels w/ pre-attached OSB on them? OSB to the outside? Then, furring strips/strapping for a rainscreen? You could just use plain foamboard instead, and skip the OSB. Those panels only come with instructions for roofing because they're designed for nailing shingles or attaching membrane to them.

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