Best Insulation Between Ceiling Joists

Stops heat loss into your attic.

Best insulation between ceiling joists.

Gaps between the insulation and the floor can. 10mm wider then necessary to ensure a friction fit when installed between the joists. The insulation should press right up against the floor between joists. Glass fibers in puffy strips with or without a paper or aluminum face.

This is a floor where the timber floorboards are attached to floor joists and the insulation suspended on timber battens between the joists. Stops heat loss into your attic. You can insulate second floor rim joists following the same steps shown here if you happen to tear out a ceiling during remodeling. Fiberglass insulation is usually the best option though handling fiberglass can be dangerous and it is not the most eco friendly option in some cases.

Set up a stepladder tall enough to work comfortably. Wall insulation keeps out cold. Best for long unobstructed spaces like over attic joists. We chose 2 in thick r 10 extruded polystyrene don t use expanded polystyrene which is a less effective air and moisture barrier.

In finished attic rooms with or without dormer insulate 2a between the studs of knee walls 2b between the studs and rafters of exterior walls and roof 2c and ceilings with cold spaces above. 2d extend insulation into joist space to reduce air flows. Must be measured and cut to fit walls or flat surfaces. Next install insulation material in between the sets of joists.

During new construction batt insulation thick strips of spun fiberglass or a paper based product is cut to fit between wall studs and ceiling joists before wallboard is put up to increase. Rigid foam is the best insulation for rim joists. Attics walls and between crawlspace joists. The procedure is to install a new joist between each pair of existing ceiling joist.

Remember not to compress or pack the insulating material as this will also be negative for the newly fixed joist. Hold the batts in place by stapling their paper faced vapor retarders to the lower edges of the joists. Extend the new joists 2inches below the original joists. Fiberglass rolls can be placed between joists but the fiberglass itself will need to be cut to fit properly between joists.

Purchase rolls or packages of insulation that will fit in the spaces between the ceiling joists. Either a rigid pir board from celotex can be cut to an exact fit and installed between the joists or a more flexible glass mineral wool gmw roll or slab from isover can be cut slightly oversize i e.