How To Extend Roof Rafters For Insulation

How to extend rafters.

How to extend roof rafters for insulation.

How to insulate 2x4 rafters. The current status is that we have 2x6 roof rafters actual 2x6 s the house was built in 1915 that are 20 o c. The first issue is with regard to how to insulate the sloped portion of the roof. By installing high density 8 inch fiberglass batt insulation the rafters will then meet an r 30 roof insulation standard.

1 improve the structure of the roof and 2 allow more space for insulation. Ceiling joists are the horizontal boards that span the width of the house resting on the outer wall plates and possibly on. Modern u value targets mean installing insulation between rafters only is rarely a viable option. The baffles will allow circulation to continue even though insulation has been installed directly in the path of the rafter air movement.

Air circulates from the lower part of the roof overhang through the rafters and out the ridge vent of your roof. Under a slate roof. I have a 1925 bungalow in michigan climate zone 5. There are some unfinished crawl space areas in the corners on the upper floor.

It allows insulation to be installed in a watertight roof either after the roof covering has been fixed on a new build or without disturbing an otherwise sound existing roof covering as part of a renovation. So we need to do two things. How to increase the interior ceiling joist for r38 insulation. They are directly below the roof sheathing and are were insulated with fiberglass batts stapled between the 2x4 rafters.

2d extend insulation into joist space to reduce air flows.