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