How to install insulation between floor joists.
How to install insulation in ceiling joists.
The standard width for joists is 24 inches.
Run the unfaced strips perpendicular to the.
Measure the depth of the existing insulation between the ceiling joists in the attic.
The insulation should fit snugly against the subfloor and between the joists.
Set up a stepladder tall enough to work comfortably.
If you want to install standard r 38 insulation.
Press the cut insulation board to fit between the rafters or joists.
Joist bays the open spaces between floor joists are prime hosts for insulation under specific circumstances.
First you ll have to maneuver batts of insulation around the clutter of wires pipes and cross bracing in a typical basement ceiling.
Leave an air gap between the roof sheathing and the board.
Make sure each run contacts the insulation you installed at the header band joists.
If there is already insulation between the joists increase the r value by installing unfaced roll insulation right on top.
Align the front of the board with the face of the rafter or joist.
Purchase rolls or packages of insulation that will fit in the spaces between the ceiling joists.
Hold the batts in place by stapling their paper faced vapor retarders to the lower edges of the joists.
Multiply the depth in inches by 3 14 to determine the r value of the existing insulation.
If using faced insulation keep the paper vapor retarder facing up and against the subfloor.
The ceiling joist system is typically constructed from substantial two by tens or larger dimension boards but some older homes have smaller joists.