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LP Smart Side series 38 on 24″ o.c. 2×6 wall

OwnerBuilderMN | Posted in Green Building Techniques on

I came across a deal on some series 38 LP Lap siding. This is supposed to be installed 16″ oc. Even if I do end up going with 16″ oc framing I will still have saved significant money.

However I am building my house with 2×6 wall and it feels like 16″ oc is really overkill. I will be installing 3″ of foam over the OSB sheating, followed by 3/4″ plywood cut in strips for the furring strips (also to create rain screen).

I can think of two options for framing (16 vs 24) oc and would like some input…

1) Frame the walls with 2×6 16″ oc and cut the plywood strips 2-3″ wide and install normally.

2) Frame the walls with 2×6 24″ oc and cut the plywood strips 8-9″ wide. I can put a nail on each side of this plywood strip. This would allow the siding to have nails every 16″ but allow my framing to be 24″ oc.

I would prefer the framing 24″ oc mostly because of the reduced thermal transfer.

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  1. Jon_R | | #1

    What's the whole wall R value difference between 2×6 16″ + 3" foam and 2×6 24" and 3" foam? Or more importantly, the build cost and heating/cooling cost differences?

    Yet another option is 2x4s at 16" spacing on 2x6 plates with interior foam strips to make up the difference.

    Solid furring strips always create some area without venting. No idea at what point this starts to cause a problem.

    1. Expert Member
      MALCOLM TAYLOR | | #2

      "Solid furring strips always create some area without venting. No idea at what point this starts to cause a problem.'

      Our code says no more than 8% of the cavity can be furring. No idea what it was based on, or if it was just pulled out of the air.

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