For loose fill cellulose this translates to a total depth ranging from 8 inches.
Coat to bring attic insulation up from 11 to r49.
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.
Thus more insulation would have a very long payback time.
Since the experts think i should have at least twice this amount of insulation what am i missing.
Wall insulation whenever exterior siding is removed on an.
I m also assuming that you won t have recessed lighting up there something to avoid in a heating climate.
Where the irc 2009 recommendations for cold climate attic roof insulation have been adopted r49 is the minimum.
We have about 3 of old insulation in our attic.
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.
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.
If you don t have enough it may be an indication that your home is under insulated and may not be properly sealed.
Looking across your attic if the insulation is level with or below the attic floor joists you probably need to add more insulation.
We want to bring it up to r49 but i have read that some suggest taking it to r60 to get more energy efficiency.
Use a zippered insulated tent to keep the enclosure draft free attic tent at 7 attic cover insulator 120.
Attic hatch or door.
Add weatherstripping around the perimeter and a sweep to the door of a walk up attic.
You need up to 19 inches or r 49 for efficiency.
The attic is already air sealed as.
When the temperature is 30 degrees i have frost on my roof.
The easiest place to get a gauge on your home s current insulation condition is in the attic.
These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.
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.
That tells me my insulation is adequate.
If you cannot see any of the floor joists because the insulation is well above them you probably have enough and adding more insulation may not be cost effective.
As noted above there are lots of higher r value per inch alternatives to fiberglass.
Affix rigid foam insulation to the attic side of the hatch or door.
Pull down stair or ladder.
I have about 6 inches of blown in insulation in my attic.
Add insulation to attic.
