How To Extend Roof Rafters For Insulation

The first issue is with regard to how to insulate the sloped portion of the roof.

How to extend roof rafters for insulation.

By installing high density 8 inch fiberglass batt insulation the rafters will then meet an r 30 roof insulation standard. There are some unfinished crawl space areas in the corners on the upper floor. Under a slate roof. So we need to do two things.

1 improve the structure of the roof and 2 allow more space for insulation. I have a 1925 bungalow in michigan climate zone 5. Modern u value targets mean installing insulation between rafters only is rarely a viable option. They are directly below the roof sheathing and are were insulated with fiberglass batts stapled between the 2x4 rafters.

How to extend rafters. Ceiling joists are the horizontal boards that span the width of the house resting on the outer wall plates and possibly on. The current status is that we have 2x6 roof rafters actual 2x6 s the house was built in 1915 that are 20 o c. 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.

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. For instance if the roof has 2 by 6 rafters and you want r 30 insulation which is standard in many communities you can add a 2 by 4 which will give you an 9 inch rafter space. The outer ends of a roof s rafters the sloped members that give the roof its pitch provide shade divert rain and create soffit space for attic ventilation. How to increase the interior ceiling joist for r38 insulation.

How to insulate 2x4 rafters.