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Old 11-11-2009, 12:27 PM   #1
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crawlspace insulation under porch


Hi

I have just finished insulating the concrete walls of my 5 ft high crawlspace with rigid foamboard. The crawlspace is heated by a small electric baseboard heater to prevent pipe freezing. One front corner of the crawlspace is below a 6' x 15' covered porch. The porch flooring is 1x4 tongue & groove.

What is the best way to insulate the crawlspace ceiling below the porch?

I have enough leftover foamboard insulation to cover the area.
Should I use it? If so, what is the best way to attach it?

Do I need vapour barrier?

The house is on an island off the coast of BC, Canada.

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Old 11-11-2009, 04:05 PM   #2
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I wouldn't insulate under the porch. If cold air is coming in, I would block the opening and insulate that.
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Old 11-11-2009, 04:19 PM   #3
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crawlspace insulation under porch


All openings, nooks and crannies where cold air can get in have been sealed and covered. So you're saying that there would be insignificant heat loss up through the 1" thick porch flooring without any insulation?
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Old 11-11-2009, 05:42 PM   #4
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is the porch a conditioned space, protected from the weather?
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Old 11-11-2009, 09:04 PM   #5
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crawlspace insulation under porch


The porch is covered by the roof but is open to the elements. See photo:

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Old 11-11-2009, 09:08 PM   #6
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Quote:
Originally Posted by shtoink View Post
All openings, nooks and crannies where cold air can get in have been sealed and covered. So you're saying that there would be insignificant heat loss up through the 1" thick porch flooring without any insulation?
What I'm saying is that depending on the layout, you might be able to close off the porch section instead of insulating the porch joists. If you post a picture, I could get an understanding of the setup.
You should look into the device that wraps the pipes and produces heat. Having an electic heater running all the time will be costly.
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Old 11-11-2009, 10:33 PM   #7
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crawlspace insulation under porch


I have no photo showing inside the crawlspace. I could probably close off that section of the crawlspace with some framing tied into one of the pony walls, but I simply don't have time to do that before winter.

I do plan to use heat tape on the water lines too.
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Old 11-12-2009, 05:20 AM   #8
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remember the rules: if it is insulated it ought to have a vapor barrier, but I agree whole heartedly with the fellow who recomended wrapping the pipes, after all an exterior porch is non- living space. Remember insulation will hold moisture, if it's getting wet from above or below get rid of it, you don't need an ice blanket around yer pipes
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Old 11-12-2009, 07:50 AM   #9
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whatever you put under porch decking will get wet

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