How To Insulate 2x6 Roof Rafters

Remember you ll need at least 1 air space above the insulation for attic ventilation.

How to insulate 2x6 roof rafters.

Box out light fixtures. It creates a breeding ground for mold and mildew and ruins the air trapping pockets that block heat flow. For example if the space beneath the rafters is going to be used for a living area then you will need to insulate the roof rafters. R 19 is made for 6 inch framing and if you installed the vent trays properly there should have been enough air movement in the cavities to prevent condensation on the back of your roof sheathing without nailing extensions to the rafters.

Water is insulation s enemy. If your attic rafters are 2 by 6 inch framing members i assume you used an r 19 batt insulation. I have a 1925 bungalow in michigan climate zone 5. For rolled insulation place it between roof rafters.

There are some unfinished crawl space areas in the corners on the upper floor. Look for water stains on the roof sheathing or damp or moldy spots on attic joists and existing insulation as a clue to where leaks might be. So your choices are 3 1 2 thick batt insulation for an r value of about r 11 9 or rigid insulation board for a r 20 to r 30 depending on the type of board. How to insulate 2x4 rafters.

They are directly below the roof sheathing and are were insulated with fiberglass batts stapled between the 2x4 rafters. Replace the floorboards and then spray more insulation on top of it.