How To Extend Roof Rafters For Insulation

The current status is that we have 2x6 roof rafters actual 2x6 s the house was built in 1915 that are 20 o c.

How to extend roof rafters for insulation.

How to increase the interior ceiling joist for r38 insulation. By installing high density 8 inch fiberglass batt insulation the rafters will then meet an r 30 roof insulation standard. How to insulate 2x4 rafters. Air circulates from the lower part of the roof overhang through the rafters and out the ridge vent of your roof.

How to extend rafters. 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 baffles will allow circulation to continue even though insulation has been installed directly in the path of the rafter air movement. 2d extend insulation into joist space to reduce air flows.

I have a 1925 bungalow in michigan climate zone 5. 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. Ceiling joists are the horizontal boards that span the width of the house resting on the outer wall plates and possibly on. So we need to do two things.

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. Under a slate roof. There are some unfinished crawl space areas in the corners on the upper floor. Modern u value targets mean installing insulation between rafters only is rarely a viable option.

1 improve the structure of the roof and 2 allow more space for insulation.