Re: exterior wall insulation
Steve --- kudos for having the IR camera work.
Originally Posted by genesisguitars
If you want to proceed with your plan it can work out nicely --- no destruction from interior.
What you describe regarding the foam is one reason I'm not a fan of a *pour in* method for foam.
Anyway, you might consider ,once removing the exterior siding/sheathing, leave the existing foam in place. As long as it's sound have a company come out and fill the voids with a spray in foam. Otherwise it will bear a bear and messy trying to remove the old foam.
Re-apply sheathing add the house wrap and the layer of rigid foam. The rigid foam on the exterior needs to be an appropriate thickness for your region to be effective.
Once you have everything in place you'll benefit from the thermal break the exterior foam will provide --- increasing the performance of the wall anywhere from 25-65% ( depending on thickness of exterior rigid foam. )
"" an ounce of perception -- a pound of obscure "