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Old 01-06-2013, 03:13 PM   #16
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pantyhose calcium chloride and Ice Dams


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What your trying to do is create a channel for the melt water to run to the gutter, so do two of them about a third of the way in from the ends of the roof,be a good idea to run a heat cable in the gutter and downspout also.
Those that did are glad they gave the water an exit and those that didn't wish they had .

A structure can be insulated to the hilt and save on heating bills and that's a good thing . And then comes the vent recommendation and that's fine by me if that toots your horn .

Well, at some point the outdoor ambient temp. is going to go above 32F - 0C . It always has and I hope it continues until the next ice age . So now let's look at what will surely happen if 36F , or possibly higher , degree air is admitted to the attic, channeled or not, and there is several inches of insulating snow on the roof .

Let's step it up a notch with the very possibility of a layer of freezing rain that preceded the snow . Ever see water trapped under a thin layer of ice that covers the full roof slope? It isn't a good feeling when the head pressure forces it to exit at the lowest available point which is often at the building line, but not always .

If you want to be certain it doesn't happen, heat trace.

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Old 01-07-2013, 08:33 AM   #17
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pantyhose calcium chloride and Ice Dams


ahaha you guys are pervs! although...no panties...I'm into that too LOL

Seriously though, I am going to insulate from everyone's recommendation. I am located in Toronto FYI.

I am planning on doing the blow in but not sure if I should remove the old batt insulation...I've put potlights in on two occasions and it was horrible. Dusty, ITCHY pink and yellow crap.

Can I just blow over it?
House was built in '69.
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Old 01-07-2013, 12:44 PM   #18
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Yes, I would feel comfortable blowing insulation over the existing batts unless they are in unusual condition. Be sure to check that there is a vapor barrier on the lower side of the batts. The winters are cold in Toronto and you don't want moisture issues since the attic appears to be an unheaqted space. By the way, as you probably know, you could also add another row of fiberglass batts either dirrectly on top or perpindicular to the existing batts depending upon the thickness of the existing batts. I suggest that you place a few sheets of 1/2 plywood in the attic (as wide as can fit) so you are less likely to fall through the ceiling below.
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Old 01-07-2013, 01:38 PM   #19
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thanks. Will do.
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Old 01-07-2013, 02:42 PM   #20
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Just to clarify. If you do add additional batts, they will be the ones w/o any vapor barrier. A double vapor barrier is never a good idea.
Good luck with your project.
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Old 01-07-2013, 03:18 PM   #21
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lol

Yes that would be bad. "Let's lock that vapor in!" haha
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Old 01-07-2013, 03:20 PM   #22
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You can seal and insulate your attic right now. I just did my mom's attics and it was freezing up there, but wear gloves and warm clothes and you'll be fine.
Am I out of line in suggesting the sealing is as important as the insulating?
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Old 01-07-2013, 03:34 PM   #23
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What do you mean by sealing? Sealing what? Like around the pot lights and everything?
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Old 01-07-2013, 03:56 PM   #24
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Note that I am not an expert.

Ideally you want to stop as much air infiltration from your heated space up through your insulation and into your attic. Extra insulation will reduce the flow of air, but only sealing it (vapour barrier) will stop the air flow so the insulation can do it's job.

So yes, ensure all protrusions through the ceiling are sealed to your vapour barrier. And this will include the top plates of all interior walls.

I have only had to seal a few small holes and even that was a royal pain.

So I'm sure the experts will chime back in and correct any erroneous advice I have given and make sure you are heading in the right direction.
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Old 01-07-2013, 04:52 PM   #25
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Sealing holes such as where electrical wires enter the attic is a very good idea. I would suggest firestop material (fiber-like) or firestop expanding foam (regardless if required by code or not) depending upon which you feel will be easier to apply. What you want to do is prevent air infiltration from the heated portion of your home to the unheated attic.
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Old 01-08-2013, 10:13 PM   #26
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This is a first I have heard of it.

I wonder what the wife says when she goes to her underwear drawer???
Jeez! Awhile ago we had a criminal breaking into homes and stealing women's apparel. It was thought that he was a weirdo.
Maybe he just had a problem with ice dams.
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Old 01-08-2013, 11:25 PM   #27
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Necessity is the mother of all invention!!

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