Terry Ruth wrote:
Code min walls are R-20. Looks like 2x4 walls so you can get R-15 with Roxul, ThermaFiber, or JM mineral wool batts plus some rigid IS R5 boards. The 2x6 roof needs R-38 min, R-23 + R 15 (stacked & staggered) Roxul Comfortboard IS outsulation. That means remove the roof felt/shingles add the IS board on top of the sheathing, then add 1x4 furring strips as ventilation gaps, then add sheathing, then deck the roof with new shingles and a ridge vent. Add the same rain plane/ventilation gaps to the walls if $ allows. Add out riggers to create 24" overhangs, ventilated silicone sealed soffits/facias, gutters. Create a skirt around a sealed crawl space insulated with R-12 IS boards in the same plane as the walls. Add R-23 to floor joist, keep the R-3 reflective foam or move it to the roof to reflect heat in the summer and use IS board in it's place. If there are no National Fenestration Ratings(NFRC) on window labels and no values and they feel cold, add low E glass storm insulated windows, U-value < .30, SHGC > .45 and seal the windows up. South facing windows use a high SHGC as possible.
Rob Bouchard wrote:Excellent... I might just do this! How thick on the outside scratch coat?