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Old 10-04-2010, 07:36 PM   #31
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Insulating an Overhang


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Originally Posted by steveel View Post
I don't see why not. Registers are frequently placed in front of exterior windows. If a window is left open to admit rain, that's a problem, cantilever or no.

I'll admit guilt there! Water and wooden houses don't get along very well do they?

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Old 10-04-2010, 10:12 PM   #32
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"“Oh, you mean I don’t have to put in a suspended ceiling here? You mean I don’t actually have to take the duct to the outside wall?” Well, of course you don’t. If you insulate your walls sufficiently and provide good windows, you don’t have to provide a duct to the outside wall; you can provide the heat at the inside wall and simply blow the air over there. If you have a piece of junk wall and a piece of junk window, yeah, not only do you have to put the vent right below the window, you’re still going to be uncomfortable. But the duct savings are significant; it’s just that they’re not usually reaped." From: http://www.greenbuildingadvisor.com/...cience-podcast

Gary
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Old 10-04-2010, 10:34 PM   #33
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Insulating an Overhang


That was a very useful and timely clipping for my situation too Gary.
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Old 10-11-2010, 12:13 AM   #34
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Insulating an Overhang


Slowly I advance...
This weekend was absolutely beautiful and I used it to work on this project. I cut all of the top foam boards and caulked them in.






I found the backer rod and so I installed that and ran a line of caulk above the bricks. I was surprised how much caulk I needed...8 tubes!



Here is a bonus picture. My burning bush is beginning to change color.




Tomorrow I am off work. I am going to try to finish it off. I will install the batting and then the sill sealer and the plywood. One question about the sill sealer. Should I just cover the joists with it (staple it up) or cover the up side of the plywood with it?

Last edited by Hurriken; 10-11-2010 at 12:16 AM.
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Old 10-11-2010, 12:21 AM   #35
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Insulating an Overhang


Good job! Just the joists to make a thermal break at the plywood soffit to house.

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Old 10-11-2010, 06:15 PM   #36
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Insulating an Overhang


Placed all the batting and sill seal.



Cut the plywood and rolled a coat of stain on it.


Screwed most of it in place...I forgot to recharge the cordless driver.



I'll put the last piece in soon and then mount some trim against the bricks.
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Old 10-30-2010, 04:50 PM   #37
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Insulating an Overhang


Nice job! This thread has been really useful to read.

I have almost the exact same overhang detail in my house...I was thinking of insulating in a slightly different way:
1) Remove plywood from underside of overhang.
2) Cut 2" XPS to fit between joists, and attach directly to rim joist, seal with great stuff foam.
3) Attach continous 2" XPS foam slab to underside of overhang. Caulk to seal all contacts between rim and floor joists
4) Attach plywood to underside of XPS using 3" screws into joists, trim around the edges of XPS slab.

Are there reasons to attach to XPS to the floor sheathing rather than to the underside of the overhang space?
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Old 10-30-2010, 05:06 PM   #38
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Interesting question. You would have to ask the experts though.
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Old 11-01-2010, 12:55 PM   #39
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Insulating an Overhang


this thread is awesome. I'm in the same situation with my raised ranch that I purchased july of 09. The first winter in the house my living room was incredibly cold. The room had a large bow window that was very very drafty. This summer I replaced the bow window with 3 anderson 400 series double hung windows and made sure to insulate around the window. Well now that the weather is getting cold I'm noticing that room is still colder than other areas of the house, especially when sitting on the couch in front of the new widows.....this is right above the overhang.

I can tell that the window is not drafty so I've been wondering how well the overhang is insulated.

I think I'm going to do some investigating in the house to find out. I can't really get into this project right now, so I'll do it with no demo.

I would be curious as to how much it would cost to have it all spray foamed if the structure was already opened up.
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Old 11-26-2010, 10:54 PM   #40
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Hurriken,

Now that it's gotten a little cooler, have you noticed any difference in the room??
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Old 11-27-2010, 01:21 AM   #41
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It seems like the floor temperature is more even. throughout the room now.

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