Asked by: Erikas Jarnikov
asked in category: General Last Updated: 29th January, 2020

How do you support insulation in floor joists?

2) Insulate between the floor joists with rolled fiberglass. Install it tight against the subfloor. Seal all of the seams carefully to keep wind from blowing into the insulation. Also, adequately support the insulation with mechanical fasteners so that it will not fall out of the joist spaces in the years to come.

Click to see full answer.


Furthermore, should I insulate my floor joists?

If the crawl space is ventilated, which is ideal because it aids in the elimination of moisture, then fiberglass insulation can be easily installed under the subfloor between the floor joists. If your crawl space isn't ventilated, insulate the walls of the crawl space rather than the subfloor of the room above.

Likewise, are rim joists load bearing? The main job of a rim joist, also called a band joist, is to provide lateral support for the joists, to prevent the joists from leaning under the weight of the load-bearing walls resting on them. The rim joist also covers the ends of the joists to cap off the joist cavities, the open spaces between the joists.

Considering this, what type of insulation do you use for floor joists?

Foam, not fiberglass, is the right choice The best insulation material for crawl spaces is rigid foam insulation board. Instead of installing the foam insulation between floor joists in the crawl space, the foam board is installed against the crawl space foundation walls.

Is it worth insulating under floorboards?

So the simple answer is Yes - it is worth insulating under the floor boards. The problem is that, unless you have space to get under the floor boards, it means taking the floor boards up. The illustration above is a typically method of insulating.

20 Related Question Answers Found

Does insulating rim joist help?

What is the best way to insulate under a wooden floor?

Will insulating floor make warmer?


Does floor insulation make a difference?

How much heat is lost through the floor?


Can you over insulate a house?

Does underfloor insulation cause damp?

How do I make my cold floor warmer?


Can I spray foam insulation myself?

How do you insulate an old house floor?

What is the minimum thickness for floor insulation?


What is the best floor insulation?