Coat To Bring Attic Insulation Up From 11 To R49

Attic hatch or door.

Coat to bring attic insulation up from 11 to r49.

For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. Use a zippered insulated tent to keep the enclosure draft free attic tent at 7 attic cover insulator 120. Pull down stair or ladder. That tells me my insulation is adequate.

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Les oct 24 12 at 14 10. Thus more insulation would have a very long payback time. Where the irc 2009 recommendations for cold climate attic roof insulation have been adopted r49 is the minimum.

In temperate coastal areas such as zone 3 attic insulation of at least r30 up to a maximum of r60 is recommended. The easiest place to get a gauge on your home s current insulation condition is in the attic. I m also assuming that you won t have recessed lighting up there something to avoid in a heating climate. The attic is already air sealed as.

Since the experts think i should have at least twice this amount of insulation what am i missing. Add insulation to attic. We have about 3 of old insulation in our attic. Affix rigid foam insulation to the attic side of the hatch or door.

Existing 3 4 inches of insulation. For loose fill cellulose this translates to a total depth ranging from 8 inches. Wall insulation whenever exterior siding is removed on an. You need up to 19 inches or r 49 for efficiency.

We want to bring it up to r49 but i have read that some suggest taking it to r60 to get more energy efficiency. To insulate to r49 you need 7 8 inches of closed cell foam insulation depending on type perhaps 12 13 inches of open cell foam or dense packed fibrous material cellulose or fiberglass fibers. As noted above there are lots of higher r value per inch alternatives to fiberglass. If you don t have enough it may be an indication that your home is under insulated and may not be properly sealed.

If there s still not enough room you can always add a layer of foam board or closed cell spray foam to the top of the roof topped by sheathing or. This may not be a question that can be answered without seeing the attic but would the extra few hundred dollar be worth the energy saving benefits. When the temperature is 30 degrees i have frost on my roof. Add weatherstripping around the perimeter and a sweep to the door of a walk up attic.