Attic Insulation 2x4 Rafters

It makes adding insulation to your attic a breeze.

Attic insulation 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. This over rafter insulation method also reduces thermal bridging giving an airtight continuous layer of high performance insulation and results in a well insulated attic space. Box out light fixtures. I would really like to get more than r 13 and the current installation is probably providing r 1 with all the missing pieces.

You can use either 2 6 or 2 4 rafters for roofs with a 3 12 pitch or greater but it depends on the overall size of your shed. Blown in insulation is installed using blowing machines. By installing high density 8 inch fiberglass batt insulation the rafters will then meet an r 30 roof insulation standard. Whether there is a real hazard or not depends primarily on your local climate climate zone as well as your shingle color type and shading factors.

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. Get a free 24 hour blown in machine. We love our diyers so take up our incentive to improve your attic insulation situation yourself. For roofs that won t experience heavy snow loads a gable roof can span up to 22 with 2 4 rafters.

Insulating the roof above the rafters is known as warm roof insulation as the rafters are brought into the insulated envelope of the building. They are directly below the roof sheathing and are were insulated with fiberglass batts stapled between the 2x4 rafters. It creates a breeding ground for mold and mildew and ruins the air trapping pockets that block heat flow. You get a free blown in machine rental with your insulation purchase.

Water is insulation s enemy. Ceiling joists are the horizontal boards that span the width of the house resting on the outer wall plates and possibly on.