Insulating Rim Joists With Roxul

We packed roxul rock wool into the end of every floor joist bay filling the area against the rim joist.

Insulating rim joists with roxul. Rockwool comfortbatt rockwool comfortboard 80 rockwool comfortboard 80 assembly class. It has a clay like consistency. To prevent these problems only air impermeable insulation either rigid foam or spray polyurethane foam should be used to insulate the interior of a rim joist. I have the following question.

Insulating the rim joists rim board or header with r tech or owens xps foam board insulation along with great stuff spray foam. Rim joist spray foam. A couple of additional tips that may be helpful if you haven t finished your project. Insulation batts designed for steel studs are slightly wider than batts sized for regular dimensional lumber and as a result work perfectly for positioning at the webs rather than flanges of engineered joists.

One thing i don t like about either. Foamed plastic maximum r value. The first floor is concrete block slab on grade. 3 rim joist standard rim joist 4 foam insulation type.

Hi all i ve been researching the best way to insulate the rim joists on the first floor of my raised ranch. I thought 1 rigid foam plus the roxul would be good enough but i just read this at the link below. Materials purchased at menar. If the foam board is properly sealed additional fiberglass insulation can be added to obtain a higher r value.

Inspired by shannon s youtube videos on rim joist insulation i started the project in my unfinished basement but had some confusion. You can tear off. I decided to go with rigid foam and roxul rock wool as fire barrier. I looked at the typical two part spray foam approach as well as canned foam and foil faced rigid insulation.

For more information see insulating rim joists. How to insulate rim joists. In cold humid or mixed climates the foam board thickness needs to be 2 thick to stop the condensation in the rim joist area. If you need to insulate these rim joists it s best to hire a cellulose insulation contractor.

If you wish to position the batt flush with either the sub floor or the drywall you can easily cut a. Two story homes usually have another ring of rim joists above the first floor ceiling. Like a basement but above ground. I am putting rigid foam 2 inch r10 first with spray foam at the edges to seal it and then put roxul rock wool as fire barrier.

Now the rock wool is facing an. Roxul is dense unlike fiberglass and inhibits airflow. Insulating basement walls insulating basement floors and basement insulation options in this article i want to focus on rim joist insulation and the options that are available. Because the air infiltration has been stopped the.

Insulate rim joists with canned spray foam and roxul. 7 5 inch 5 protective covering of foam insulation certified manufacturer. 5 1 2 inch 140 mm 2 in 50 mm 3. Classification b classification b classification a minimum thickness.

Another option for your rim joist.