Attic Insulation 2x4 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.

Attic insulation 2x4 rafters.

Water is insulation s enemy. It creates a breeding ground for mold and mildew and ruins the air trapping pockets that block heat flow. Box out light fixtures. It makes adding insulation to your attic a breeze.

For roofs that won t experience heavy snow loads a gable roof can span up to 22 with 2 4 rafters. For roofs that will experience heavy snow or wind and will span the same distance use 2 6 rafters. Ceiling joists are the horizontal boards that span the width of the house resting on the outer wall plates and possibly on. 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.

You get a free blown in machine rental with your insulation purchase. They are directly below the roof sheathing and are were insulated with fiberglass batts stapled between the 2x4 rafters. By installing high density 8 inch fiberglass batt insulation the rafters will then meet an r 30 roof insulation standard. Blown in insulation is installed using blowing machines.

I would really like to get more than r 13 and the current installation is probably providing r 1 with all the missing pieces. 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. 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. We love our diyers so take up our incentive to improve your attic insulation situation yourself.

How to increase the interior ceiling joist for r38 insulation. Get a free 24 hour blown in machine.