Rigid Insulation Between Floor Joists
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If the floor assembly penetrates the air barrier between a house and an attached garage rectangles of rigid foam should be installed between each joist to prevent air leaks.
Rigid insulation between floor joists. Fill the ends of joist bays with rectangles cut from rigid board insulation. A semi rigid material is generally best as it can be cut very slightly oversized and squeezed in between the floor joists thereby ensuring no draught causing gaps. Use caulk or foam sealant to seal the joint between the top. Cut the strips to fit between floor joists using a box cutter.
Use foam sealant such as great stuff to seal the joints. This can be achieved through the use of truss joists scissor truss framing or sufficiently large rafters. The insulation should be pushed tight to the underside of the floorboards. For example cathedral ceilings built with 2x12 rafters have space for standard 10 inch batts r 30 and ventilation.
Cut the strips to size cut rigid foam insulation into strips with a table saw or a circular saw. Instead of installing the foam insulation between floor joists in the crawl space the foam board is installed against the crawl space foundation walls. Cathedral ceilings must provide space between the roof deck and home s ceiling for adequate insulation and ventilation. If you have an unvented crawlspace or basement you must insulate the walls instead of the floor joists.
What the code says. As for insulating below the joists an insulating laminate insulation bonded to plasterboard such as celotex pl4000 or a separate rigid pir insulation board finished with a separate sheet of plasterboard can be securely fixed to the joists to provide an internal finish to the roof. Each rectangle needs to be sealed at the perimeter with caulk or canned spray foam.
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