Cantilever Floor Insulation Detail

Of course you need to protect the rigid foam from abuse with a layer of plywood osb or soffit material.

Cantilever floor insulation detail.

Install insulation without misalignments compressions gaps or voids to fill the cantilever floor cavity making full contact with the top bottom and sides of a cantilevered floor cavity cover the bottom of the insulated cantilever floor cavities with a rigid weather resistant solid blocking material such as plywood or house siding. You should only put in fiberglass insulation if you can access the cantilevered floor joist from a basement or crawl space. In addition to floors other cantilevered architectural features may require insulation. Any suggestions would be greatly appreciated.

Usually only the cantilevered portion of the floor needs to be insulated. If the floor is over a garage and has not already been insulated however it is recommended that each joist bay be filled with insulation. When it comes to floor assemblies the stack effect works in your favor lowering rather than increasing the risk of moisture accumulation. 2 cut pieces of 1 inch nonstructural sheathing board or 1 inch rigid foam sheathing to fit inside the.

I am working on a project where the main floor is cantilevered over the concrete foundation wall. You can use rigid foam of any thickness on the underside of a cantilevered floor in your climate zone. Measure the size of the opening between the floor joists underneath the cantilevered overhang. Cellulose insulation can be installed in the cantilever floor joists two ways through access from the crawl space or by drilling holes through the bottom of the overhang.

Cellulose cantilevered floor insulation. Installing cellulose via the crawl space is fairly simple as it is just blowing the material into the floor joists. The details i do have show a cantilever over a wood frame wall not a concrete foundation wall.