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-   -   Attic insulation (http://www.diychatroom.com/f2/attic-insulation-62277/)

johndeer 01-19-2010 11:18 AM

Attic insulation
 
Hey guys new to the site hope i'm posting in the right spot.i want to spray exrta insulation in the attic rent the machine from home depo and do my self my problem is that my roof overhangs my deck and there is no insulation in that spot there really ain"t no need for any insulation there i was wondering if i should build a wall out of riggit insulation in the attic to close that off before i spray any ideas would be great i live in cambridge ontario and it gets cold here.

Ron6519 01-19-2010 12:08 PM

The overhangs need to be left open to allow cool air in as the hot air is expelled through the attic vents at the ridge. You want to install baffles in all the rafter bays so you don't seal the openings.
Ron

johndeer 01-19-2010 02:44 PM

Quote:

Originally Posted by Ron6519 (Post 385647)
The overhangs need to be left open to allow cool air in as the hot air is expelled through the attic vents at the ridge. You want to install baffles in all the rafter bays so you don't seal the openings.
Ron

I understand that the overhangs have to be left open but the over hang that i"m talking about is @the gable end of the house the overhang is about 8x 12 it's quite a large opening without any insulation just thought that i would be losing to much heat out that way.

ferris13 01-19-2010 03:17 PM

I just tackled this project myself this past weekend.

I have a wall of the family room that seperates my attached garage. The ceiling of the FR is accessed via the garage. The garage is unconditioned and could equate to an outdoor space. What I did was made sure I blew in about R60 over the FR ceiling. Then I overlapped 12 inches into the garage attic area. I stapled some left over material I had to create a wall to keep the loose fill insulation in place so it just wasn't spilling into the garage attic. This way I felt I was overlapping where the interior ceiling and garage attic meet. The previous insulation stopped exactly where the top plate of the wall would be.

I took about 2 hours the day before to added all my baffles, box out other fixtures I needed too and added the "insulation measuring guide" all around the attic. I had some cathedral ceilings and man it was a pain to get some baffles in. It was well worth the prep the day before though.

HD rents the Attic Cat unit here in Michigan for the whole day if you buy 10 bags of insulation. I simply bought the product and took the machine home the night before so I was ready first thing in the morning. Took me less than 3 hours to add and additional R30 to about 1300 sq.ft. I would also buy several extra bags in case you need them. You can always return.

Have fun.. oh I also picked up a painters suit (8 bucks). 1 piece, light paper suit you can just take off and toss out when your done.

Ron6519 01-19-2010 03:36 PM

Quote:

Originally Posted by johndeer (Post 385711)
I understand that the overhangs have to be left open but the over hang that i"m talking about is @the gable end of the house the overhang is about 8x 12 it's quite a large opening without any insulation just thought that i would be losing to much heat out that way.

The baffle gets stapled to the roof sheathing, you can build the wall you mentioned up to the bottom of the baffles. This will allow you to insulate over the top plates while still allowing ventilation.
Ron

Shamus 01-19-2010 04:55 PM

http://i367.photobucket.com/albums/o...ic/baffles.jpg
http://i367.photobucket.com/albums/o...ic/blownin.jpg
http://i367.photobucket.com/albums/o...insulation.jpg

To the OP, and as others have mentioned, yes, put up your insulation panels to block off the overhang over the deck.

Just make sure you allow for insulation to cover the top plate of the wall below. See the "pink" in the last photo. And as that picture shows, you should end up with air flow through the soffit and and up the baffels (or as its labeled in the pic, "Air Chute") and out the ridge vent.

Wildie 01-21-2010 08:59 PM

Quote:

Originally Posted by johndeer (Post 385624)
Hey guys new to the site hope i'm posting in the right spot.i want to spray exrta insulation in the attic rent the machine from home depo and do my self my problem is that my roof overhangs my deck and there is no insulation in that spot there really ain"t no need for any insulation there i was wondering if i should build a wall out of riggit insulation in the attic to close that off before i spray any ideas would be great i live in cambridge ontario and it gets cold here.

All you need is crib of some sort to keep the cellulose contained inside the house!
There is no need to crib it up with rigid foam insulation. This stuff is expensive!
You could make a crib from a sheet of mahogony panelling, for instance! Cut a 4X8 sheet into 2, 2X8 sheets!


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