Attics with few obstructions or penetrations to work around.
Best material for attic hatch.
They work best for.
Several layers should be applied.
Intake vents located at the lowest part of the roof under the eaves allow cool.
Foil faced polyiso is the greenest and best performing of the rigid foam options.
I glued the foil board to the door hatch and used screws to hold it in place.
An attic access hatch made of drywall is replaced by a plywood board.
Insulation is added and the opening is weather stripped.
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A couple of hours in washington the recommended r value for attics is r 38.
Attach the two layers of foam board together and apply them to the hatch.
Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.
Attics with standard joist spacing especially those with no insulation.
Install fiberglass batt insulation on top of the foam board.
In our ongoing series on air sealing we are going to focus on the dreaded attic hatch or as allison baile s of energy vanguard so eloquently calls it a mind blowing hole in your building envelope instead of crunching the numbers as he did one just needs to walk by one in a hallway during the middle of summer to know it isn t insulated.
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Insulating the attic hatch.
Building codes call for the hatch to be insulated at the.
Cut out two pieces of rigid foam board that are 1 4 inch smaller than the hatch so homeowners can slide the attic access panel open easily.
Wash rinse and repeat until you have added at least 4 inches of foam but preferably 8 inches of foam.
Attach foil insulation board to the back of the attic hatch panel.
Baffle allows airflow and prevents insulation blocking.
I used 1 board which has an r 6 5 insulating value.
Attics with sufficient headroom for maneuvering during installation.
Caulk gun you need a caulk gun and know how to use it in order to fill air leaks with caulk.
Expandable foam spray get several cans of expandable foam spray to seal larger gaps 1 4 inch to 3 inches.
Heat resistant caulk use this type of caulk when sealing air leaks around fireplaces chimney and flues.
For high heel high r value attics.
Accuvent high energy extreme attic vents 14 5x50 box of 50 accuvent high energy extreme attic vent system fits 14 5x50 soffit framing areas.
Diyers who don t mind cutting the material to fit around obstructions.
Apply a bead of foam compatible glue to it and attach it to the plywood hatch.