attach board and batten directly to foam insulation?

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Old 08-03-17, 10:17 AM
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attach board and batten directly to foam insulation?

I am insulating the outside of a cabin with 1.5 inch foam board - no insulation on the inside - and I am wondering if there is a problem attaching the exterior boards directly on top of the insulation and nailing through into the sheathing below (same one inch pine boards) - see the attached image. Does there need to be a gap for...air circulation? Is it more typical to attach nailing strips for these outside boards?
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Old 08-03-17, 11:55 AM
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If you are wanting to do a rainscreen installation, yes, there would be furring strips over the foam and into the studs. Rainscreen is typically done in very wet areas where the siding may become saturated with moisture. If the siding will ve painted, the boards are also frequently backprimed prior to installation as this helps limit the ability of the wood to readily absorb moisture, either liquid or vapor.

But if you are not in a wet area or are not worried about paint holding onto the siding, it would likely be fine to nail it directly to the foam. One caution would be that the foam compresses when nailed so you need to exercise care when nailing or else you can unintentionally create waves and dimples.

And your nails should be long enough to go into 1" of solid wood. You can generally find hot dipped galvanized siding nails that are longer than normal, but have a narrow "splitless" shank and a small head. No one likes to see giant 8d or 10d sized nail heads on their siding.
 
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