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Old 02-07-2010, 11:37 AM   #1
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crawl space venting and HE furnace?


I am in Vancouver BC, Canada. I just had a new HE furnace installed. The installer ran 2 pvc pipes out the side of my house. Is there a cap that could be put over the ends for looks? My crawl space already has vents, are they needed? When i first moved in, the crawls space smelled fine. I put up styrofoam sheating around the walls and after that the crawlspace became a little musty. What would be best here?

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Old 02-08-2010, 12:55 PM   #2
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crawl space venting and HE furnace?


I can't answer the furnace venting question (that might be best for the HVAC forum), but did you close off your crawlspace vents? And what does your crawlspace floor look like?

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Old 02-08-2010, 01:18 PM   #3
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crawl space venting and HE furnace?


I had left the vents open and then closed them for winter. floor is rocky with plastic over top
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Old 02-08-2010, 02:40 PM   #4
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crawl space venting and HE furnace?


It's musty because the humidity level is high and allowing mold to grow. Again, I'm not an expert, but there may be a breach in your vapor barrier (the plastic). I don't know if the new furnace has anything to do with it.

Hopefully someone has a suggestion for the vents.
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Old 03-07-2010, 11:26 PM   #5
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crawl space venting and HE furnace?


The crawlspace should be sealed and insulated. I own a specialized crawlspace improvement company called "Crawlpaces.com" in Chicago (originally I am from Vancouver). I have been creating healthy, conditioned crawlspaces for over 10 years. Your best answer to the musty air is to create mini-basement and seal off the gravel/rock/dirt with a concrete floor. Use a good vapor barrier and pump in 3-4 inches of concrete. Insulating with spray foam on the foundation is ideal for this area as well, and you will never have a problem with mold or humidity again. Put in a dehumidifier for an added precaution, but it likely wont run often. Go to the site CRAWLSPACES.COM to learn more - and send me an email - I'll be in Vancouver end of March if you would like to show me the crawlspace for further ideas.
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Old 03-07-2010, 11:34 PM   #6
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crawl space venting and HE furnace?


The HVAC unit sounds like a 90 percent efficient, so you do not need any make up air (the 2 PVC pipes are combustion air and exhaust). The odor is due to weak vapor barrier, which will likely never be sealed properly. The smell in the crawl, to be sure, is not at all related to the HVAC system. It is also correct to stop outside air venting of the crawlspace. Another good idea is to include a supply vent from your ductwork and push conditioned air into the space as well, which creates the mini - basement effect and will warm your floors in the winter.
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Old 03-09-2010, 09:31 AM   #7
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crawl space venting and HE furnace?


Where is the furnace condensate draining to?
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Old 03-09-2010, 11:10 AM   #8
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crawl space venting and HE furnace?


the furnace condensate is draining to a pump which in turn runs to the main vent stack/drain.
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Old 03-09-2010, 03:56 PM   #9
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Good. I often see the condensate spilling into the crawl space.
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Old 03-09-2010, 04:13 PM   #10
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crawl space venting and HE furnace?


Quote:
Originally Posted by Greg Mitchell View Post
The HVAC unit sounds like a 90 percent efficient, so you do not need any make up air (the 2 PVC pipes are combustion air and exhaust). The odor is due to weak vapor barrier, which will likely never be sealed properly. The smell in the crawl, to be sure, is not at all related to the HVAC system. It is also correct to stop outside air venting of the crawlspace. Another good idea is to include a supply vent from your ductwork and push conditioned air into the space as well, which creates the mini - basement effect and will warm your floors in the winter.
GM

When you say "include a supply vent from your ductwork and push conditioned air into the space as well, which creates the mini - basement effect and will warm your floors in the winter." do you mean to heat the crawl space as well?
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Old 03-09-2010, 04:33 PM   #11
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crawl space venting and HE furnace?


Quote:
Originally Posted by Greg Mitchell View Post
The HVAC unit sounds like a 90 percent efficient, so you do not need any make up air (the 2 PVC pipes are combustion air and exhaust). The odor is due to weak vapor barrier, which will likely never be sealed properly. The smell in the crawl, to be sure, is not at all related to the HVAC system. It is also correct to stop outside air venting of the crawlspace. Another good idea is to include a supply vent from your ductwork and push conditioned air into the space as well, which creates the mini - basement effect and will warm your floors in the winter.
GM

When you say "include a supply vent from your ductwork and push conditioned air into the space as well, which creates the mini - basement effect and will warm your floors in the winter." do you mean to heat the crawl space as well?

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