Timeline for Vented vs unvented crawl space
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
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| Nov 24, 2012 at 23:00 | comment | added | bcworkz | The radon system vents under the poly, but we're talking whether to vent the crawl space or not. The radon system does not vent the crawl space. If you have floor and duct insulation, I would opt for smaller conditioned volume. Without it, you are sort of conditioning the crawl space anyway, so you may as do it effectively and seal it as a condition space. If still a toss up, I would ventilate the crawl space simply as a backup to the radon system. Despite evidence to the contrary, I don't fully trust radon systems in the long run. --just realized this is out dated, oh well. | |
| Apr 29, 2011 at 14:49 | comment | added | Peter Q | Regarding construction cost, I'd actually have more work to isolate the crawl from the basement than if the crawl was to be vented. I'm adding the poly plastic on the dirt regardless. I'm thinking wouldn't the radon exhaust act as a vent since it's sucking air via the perforated drainage pipe which would be under the plastic? Then the space above the plastic can be connected to basement part. Note that my basement would be finished, so there's going to be drywall between the crawl and the living areas. | |
| Apr 29, 2011 at 11:15 | comment | added | shirlock homes | I read the article, I can understand the theory. The main point is obviously that the crawl has to be air and moisture tight for including it in the HVAC system. The real advantage seems to be lowering the humidity in the crawl and treating it like a full basement. Actually, not many full unfinished basements are heated and cooled. I can see some advantages, but not sure how they weigh against the cost of construction and added energy costs. Still a toss up in my mind. Not convinced yet. | |
| Apr 29, 2011 at 3:06 | comment | added | Peter Q | Putting registers in the crawl space doesn't make sense to me either. Maybe a return? Hmm, the negative pressure will pull cold air as well which, again, would be a waste. I'm still confused about this because of all those articles like the one I cite above. This is exactly why I post the question here. I highly appreciate your answer and I'd be very curious to see other answers with the oposite opinion coming from experienced people like you. If I don't hear anything I'll probably ignore that theory. | |
| Apr 29, 2011 at 2:53 | vote | accept | Peter Q | ||
| Apr 29, 2011 at 2:53 | |||||
| Apr 28, 2011 at 21:43 | history | answered | shirlock homes | CC BY-SA 3.0 |