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Old 01-24-2014, 08:20 PM   #1
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Crawlspace


My crawl is approx. 14x14, and is vented. There's HVAC ducting in there as well. Cinder block walls. House is a Duplex.

There currently isn't any insulation in the joists, but I see that a vapor barrier has been put on the ground.

I'm looking to insulate the floor joists over my part of the duplex (with owner's permission) as the room above (bedroom) is very cold.

Should I continue with the vented or should I block the vents? What are the pros and cons of each?

I'm thinking simply a new vapor barrier, and insulation, and close off the vents, but I wanted to seek advice.

What are my options?
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Old 01-24-2014, 09:43 PM   #2
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Insulate the floor and leave the vents open.
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Old 01-24-2014, 10:44 PM   #3
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No way do you want those vents open this time of year.
They should have been closed months ago in your area.
Before insulating you need to seal up any holes in the bottom plates where wiring or plumbing was run with expanding foam.
Add 2, foam to the rim joist and seal any gaps with foam.
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Old 01-24-2014, 11:30 PM   #4
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joe,

I'm with you on sealing any holes.

I have seen, in the past, and it may have been corrected since by a plumber, the crawl with standing water. Not sure if it comes from any holes in the cinderblock, or if it was a plumbing leak, but do I need to concern myself with rain water getting in before insulating? I mean it's really cold, and I need to correct that quickly, but if there's any waterproofing required, that might be a financial hold up for me. Is there any DIY ways to seal any holes that may be coming through the cinder block?
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Old 01-24-2014, 11:40 PM   #5
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Outside regrading so it runs away from the foundation.
Getting rid of any mulch piled up against the foundation.
Making sure you have working gutters with down spouts leading away from the house.
Not having any landscape timbers forming pond.
Will go a long way to keep the crawl space dryer.
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Old 01-24-2014, 11:47 PM   #6
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Quote:
Originally Posted by joecaption View Post
Outside regrading so it runs away from the foundation.
Getting rid of any mulch piled up against the foundation.
Making sure you have working gutters with down spouts leading away from the house.
Not having any landscape timbers forming pond.
Will go a long way to keep the crawl space dryer.
If re-grading needs to be done, then I don't see it happening. The entire house is bounded by a paved driveway, and parking lot.

Thanks for the help, Joe, I might just have to deal w/ the moisture
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Old 01-24-2014, 11:49 PM   #7
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I wonder if I should permanently seal the vents, or just open/summer and close winter?
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Old 01-26-2014, 11:17 PM   #8
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Quote:
Originally Posted by sirsparksalot
I wonder if I should permanently seal the vents, or just open/summer and close winter?
I used to open my two crawl space vents in late spring and then close them in the fall. The crawl space was either damp from summer humidity or freezing cold during winter. I've since closed them for good and sealed them with rigid foam while doing the rim joists. The crawl space now stays around 63 degrees all year round.
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