2x6 Roof Rafters Insulation

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.

2x6 roof rafters insulation. There are some unfinished crawl space areas in the corners on the upper floor. It creates a breeding ground for mold and mildew and ruins the air trapping pockets that block heat flow. By installing high density 8 inch fiberglass batt insulation the rafters will then meet an r 30 roof insulation standard. Here s how to use 3 layers of 2 inch polyiso foam board to meet code and keep your ne.

I have a 1925 bungalow in michigan climate zone 5. Box out light fixtures. Most of the lath and plaster covering the underside of the roof will go. Currently a living space with what looks like 50 year old mineral wool insulation.

They are directly below the roof sheathing and are were insulated with fiberglass batts stapled between the 2x4 rafters. Planning on upgrading the insulation of the top floor under sloped roof. When renovating an older home whose roof rafters are only 2x6 really 5 1 2 x 1 5 in dimension the available space for insulation and ventilation is limited therefore limiting the options for a combination of good under roof ventilation and high insulation r values in the cathedral ceiling. Although there are many different circumstances that may call for insulating roof rafters the means to determine the necessity for insulating rafters remains the same.

How to insulate 2x4 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. Water is insulation s enemy.