Pole building wall insulation
I’m having an 800 square foot shop built using post frame construction in Bellingham, WA (Climate Zone 4 Marine). It’ll be sort of an evenings-and-weekends space, so it’s potentially a bit less of an energy hog than the same building would be as a residence.
The walls are mostly horizontal 2×6 girts on 24″ centers (“bookshelf” style). Plan A (before I really did enough research) was T1-11 on the outside, housewrap, fiberglass batts between the girts and then interior drywall.
A couple of the walls are fire-rated, an so there’s a layer of 5/8″ GWB between the girts and the housewrap, the girts are on 12″ centers, and every other one is a so-called L-girt, where a 2×6 under the outside edge (vertical cross section), helps support the girt (picture attached).
Furring out the framing another 2″ would actually make for a smoother interior finish, as it would match up with the corner building posts and overhead door frames.
I’m open to suggestions, but in terms of specific questions:
1. Is there a commercial furring product that provides a thermal break that would work well for this application?
2. If I go with batts in the wall, should I worry about the depth variation from the L-girts? Should I maybe cut-and-cobble some 1.5″ foam in the “low spots” to even it out before installing the batts?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part