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The disadvantage is that it would be very very hard to reach the desired r value from r 49 to r 60 depending on climate for attic insulation.
Sealing wall in attic. Install drywall then seal the seam from the attic side with caulk foam or drywall adhesive but not other construction adhesives. Before installing drywall install caulk or other sealant or a foam gasket to the face of the top plate then install the. Air sealing the wall plate around the perimeter of your attic blocks air from escaping around the outer edges of your home. Heat is vertically polarized so insulation in the attic should be at least twice as much as in the walls.
It s usually the hardest place to air seal because the cramped space underneath the eaves where the roof rafters rest on the outer wall makes it hard to move your hands and head. So it is important to seal the window frame to the. Not the r factor of the walls and celling. But the biggest killer for heat loss is infiltration rate.
When you re done sealing your attic bypasses push the insulation back into place with an old broom handle or stick as you back out of the attic. And having thermo pane windows are worthless if air is leaking around the sill. Then finish up by sealing the access hatch with self sticking foam weatherstrip photos 10 and 11. If your hatch rests directly on the moldings like ours did add 2 1 2 in wide stops around the.
To properly seal your attic hatch also known as an attic door or scuttle hole at a minimum you should apply weather stripping and ensure the attic side of the attic door is insulated. Insulating and air sealing knee walls unvented version. Energy star states that the most significant air leaks are often hidden in the attic below the insulation. The advantage here is that your knee wall is probably already insulated this way so it s just a matter of buying some foam so cheap.
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