Best Way To Insulate Floor Joists

Trim pieces of fiberglass insulation using a utility knife so the pieces fit into joist bays along the rim joist.

Best way to insulate floor joists. How to install insulation between floor joists 1. Aluminum sheeting can also be used to insulate between joists but this may not be the most efficient method for floors. According to the 2012 irc the minimum r value for floor assemblies is r 13 in zones 1 and 2 r 19 in zones 3 and 4 r 30 in zones 5 and 6 and r 38 in zones 7 and 9.

Blown in insulation is also an option though this can be messy and somewhat inefficient. Batt insulation can be used but it will need to be secured in place properly. 1a attic access door 2.

Cut rigid foam insulation into strips with a table saw or a circular saw. Two story homes usually have another ring of rim joists above the first floor ceiling. Fiberglass insulation batts or rolls are the most economical and easiest diy choice for insulating between the floor joist in a crawl space.

In unfinished attic spaces insulate between and over the floor joists to seal off living spaces below. Cut the strips to size. View of second story floor joists from below.

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. Don a dust mask safety goggles and gloves. If you need to insulate these rim joists it s best to hire a cellulose insulation contractor.

Wear a long sleeved shirt when handling fiberglass insulation. If the air distribution is in the attic space then consider insulating the rafters to move the distribution into the conditioned space. Push the insulation.