Where do I find R49 insulation for my roof/ceilingI also need R 18 for walls and R25 floorsCan I purchase insulation for the exact R value I needI see a lot of insulation that say R19, R30 and the likeHow do you get up the the R value that is required.Thank you
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It's doubtful if you can find fiberglass insulation in the exact values you have specifiedSix inch thick fiberglass equals R 19Three and one half inch thick fiberglass equals R 11To achieve an R 49 in the roof using fiberglass you would need two layers of R 19 and one layer of R 11If your walls are built with 2X6 studs you can get an R 19 with one six inch layer of fiberglassIf the walls are built with 2X4 the best you can do with fiberglass is R 11Compressing fiberglass reduces its' R valueTherefore, if you put a six inch piece of fiberglass (R 19) into a 2X4 wall, the R value would be reduced to R 11 due to the compressionFloor blankets are usually only R 19To get the R 25 you would need to use one layer of R 19 and split another layer of R 19 in halfI have installed thousands and thousands of square feet of fiberglass insulation in roofs, walls and floorsDon't forget to install your vapor barrier in walls and ceilingsThe vapor barrier goes on the warm, or heated, side of the living area.
