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Community and Q&A

Bonfiglioli strapping size

PJ Clem | Posted in Energy Efficiency and Durability on

Does anyone know why Bonfiglioli uses 1×3 straping instead of instead of 1×2?

In addition to additional cost, it requires 2 different assemblies: 1 centered for wall studs and 1 offset for plates and corners. The only functional benefit seems to be having additional nailing surface, which might be necessary given need to accommodate 4 mechanical fasteners: insulation to strap, then assembled furring to studs, then drywall to furring, and then trim/cabinetry/pictures on drywall.

Any concern with ripping down Zip-R to strips versus site-assembled?

The only differences I can come up with are assembly is fully adhered, OSB instead of lumber strap, strap has to be same width as insulation, and Polyiso not EPS

If Zip-R, with need for 1 less mechanical fastener, what size to rip strips?

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Replies

  1. Steve Knapp CZ 3A Georgia | | #1

    I have read that Zip-R is a practical option when using this method. (I believe Dana made this suggestion.)

  2. GBA Editor
    Martin Holladay | | #2

    P.J.,
    The main reasons why Bonfiglioli uses 1x3s, I suspect, is:

    1. Most lumberyards don't sell 1x2s, and he didn't want to waste time ripping wide boards down to 2 inches on his tablesaw, and

    2. If you use 1x2s, the boards are more likely to split when you install a fastener.

    But if you have a ready source of 1x2s, and you can solve the splitting problem, 1x2s might work.

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