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.
Coat to bring attic insulation up from 11 to r49.
We have about 3 of old insulation in our attic.
Use a zippered insulated tent to keep the enclosure draft free attic tent at 7 attic cover insulator 120.
Existing 3 4 inches of insulation.
Affix rigid foam insulation to the attic side of the hatch or door.
When the temperature is 30 degrees i have frost on my roof.
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.
Les oct 24 12 at 14 10.
For loose fill cellulose this translates to a total depth ranging from 8 inches.
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.
Looking across your attic if the insulation is level with or below the attic floor joists you probably need to add more insulation.
In temperate coastal areas such as zone 3 attic insulation of at least r30 up to a maximum of r60 is recommended.
The attic is already air sealed as.
If you don t have enough it may be an indication that your home is under insulated and may not be properly sealed.
The easiest place to get a gauge on your home s current insulation condition is in the attic.
Wall insulation whenever exterior siding is removed on an.
I have about 6 inches of blown in insulation in my attic.
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.
Add insulation to attic.
You need up to 19 inches or r 49 for efficiency.
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.
We want to bring it up to r49 but i have read that some suggest taking it to r60 to get more energy efficiency.
Since the experts think i should have at least twice this amount of insulation what am i missing.
Where the irc 2009 recommendations for cold climate attic roof insulation have been adopted r49 is the minimum.
These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.
As noted above there are lots of higher r value per inch alternatives to fiberglass.
I m also assuming that you won t have recessed lighting up there something to avoid in a heating climate.
Pull down stair or ladder.
That tells me my insulation is adequate.
