Insulating Basement Rim Joists With Roxul
If you have an unfinished basement you can properly insulate the rim joists in two or three hours.
Insulating basement rim joists with roxul. Keep in mind that year it was very very cold like 25 so it was an unusual year. Insulating the rim joists rim board or header with r tech or owens xps foam board insulation along with great stuff spray foam. Of rigid foam or spray foam.
The inflow of outside dry air more than offsets the outward diffusion of interior relatively more humid air outward toward the cold rim. This will also block tiny passages where spiders and. This area is notorious for gaps and cracks.
The roxul had stuck to the wood in the rim joist and caused mold in a few. Another option for your rim joist. In cold humid or mixed climates the foam board thickness needs to be 2 thick to stop the condensation in the rim joist area.
It should be noted that using a porous insulation to insulate the rim joist area is less likely to cause a problem with moisture accumulation at the rim board in winter in cases where the rim area leaks air badly. We packed roxul rock wool into the end of every floor joist bay filling the area against the rim joist. Roxul is also fireproof so the packed area extended to the top of.
In just a couple of hours you can seal and insulate your rim joists which are major sources of heat loss in many homes. Because the air infiltration has been stopped the. Took it all out cleaned the mold and had it open ever since.
If the foam board is properly sealed additional fiberglass insulation can be added to obtain a higher r value. Properly insulating and air sealing rim joists band joists takes patience so most builders simply stuff in some fiberglass and walk away. If you re using canned spray foam you ll find that wide cracks are easier to seal than narrow ones so it s a good idea to cut the rectangles.
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