Reducing Thermal Bridging
Last Post 23 Dec 2021 10:24 PM by Dilettante. 3 Replies.
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RedsaUser is Offline
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22 Nov 2021 03:53 PM
In the planning stage of building a small summer camp. The walls will be constructed of 2 2x6 (sideways) sandwiched between 2 3/8" Plywood.

We are thinking of grooving the 2x6's as way to reduce Thermal Bridging.

Would the grooves make 'any' deference even if we were unable to insert some spry-foam?

Thanks.

P.S. unable to post image.
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06 Dec 2021 02:49 PM
Posted By Redsa on 22 Nov 2021 03:53 PM
In the planning stage of building a small summer camp. The walls will be constructed of 2 2x6 (sideways) sandwiched between 2 3/8" Plywood.

We are thinking of grooving the 2x6's as way to reduce Thermal Bridging.

Would the grooves make 'any' deference even if we were unable to insert some spry-foam?

Thanks.

P.S. unable to post image.



if this is a summer camp what is the great effort to reduce thermal bridging for?
Location?
Chris Kavala<br>[email protected]<br>1-877-321-SIPS<br />
AltonUser is Offline
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06 Dec 2021 06:23 PM
Why walls with two 2x6's sideways?
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DilettanteUser is Offline
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23 Dec 2021 10:24 PM
Sandwiching 2x6's between plywood DOES NOT reduce thermal bridging.
You still have the thermal bridge. It's just THICKER. But it's still a solid wood connection.

Figure 1 or 1.25 (some say 1.41, I prefer pessimism) per inch.

2x6's are 1.5" x 5.5"
Sndwiching 2 together gives you 3".
2 sheets of 3/8" plywood will give you 3/4"
So you're looking at R3.75 or R4.6.
Even using crappy insulation, the heat will just bleed right through the "studs" AND the plywood.

If you're serious about reducing/eliminating thermal bridging, go for continuous insulation around the outside of the structure, underneath whatever sheathing you're going to use on the building.
You COULD do double-wall construction with offset studs. But that's probably more expensive than just wrapping the building in insulation.
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