11:05AM | 09/22/10
Member Since: 09/21/10
2 lifetime posts
Hey guys!

I have a question about crawlspace humidity.

I live in an old house (c. 1914) with a huge crawlspace. It's approximately 75ft by 25ft, staring at 10 ft ceilings at one end and going to 4ft at the other. It has an earth floor covered with a vapor barrier. The space is not sealed, but there are no gaping holes to the outside either.

The humdity in this space in the summer is constantly between 70% and 80%. I have talked to several people about this and have received 2 different pieces of advice. Half the people say I should seal it up and get a whole house de-humidifier down there, and the other half say I should put in air vents or an exhaust vent to get outside air circulating. I am very confused by this as they seem to be opposites!

Any advice you could offer will be much appreciated.

Many thanks!



10:08AM | 10/05/10
Member Since: 11/18/98
187 lifetime posts
Since you did not post your location.

It is harder to respond if your floors are insulated it would not matter where you lived i would go for ventilation. For a few reasons.

It may eleminate Radon gas. And it is passive. No system to break down, no pipes to clog, no electricity.

However if you live in a cold climate with a huge variance between temperature. Those vents would need to be shut in the winter. And do you know the humidity level in the winter. You did not say.




10:11AM | 10/05/10
Member Since: 09/21/10
2 lifetime posts
Thanks for your response. I live in Atlanta Georgia. Average summer temp is about 90 and average winter temp is about 35. I do not know what the humidity is in the winter.

Would you mind explaining why the vents would need to be shut in Winter please?

Many thanks again for your response.



11:12AM | 10/05/10
Member Since: 11/18/98
187 lifetime posts
If you have pipes running through there you may risk them freezing.

I am guessing below grade. no vents that risk is practically nil.




11:06PM | 07/20/11
Member Since: 06/22/11
27 lifetime posts
i would suggest the vents for circulation. it makes more sense than having a de-humidifier.


06:11PM | 09/19/11
Member Since: 07/22/11
28 lifetime posts
No dehumidifier is needed. That would be an unnecessary hassle


Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.


type the code from the image


Post_new_button or Login_button

All bookworms need a good bookmark that inspires them to keep reading. To make this colorful bookmark, cut a rectangular p... It turns out that many bath and kitchen cleansers contain chemicals that are dangerous to the skin and eyes, and often pro... So often we paint tiny nooks white to make them appear larger, but opting for a dark, dramatic wall color like this one—Be... Chocolate-colored walls and large window frames allow the exposed wood beams to take center stage in this small screened p... If you're not crazy about the idea of commingling plants and pool, this modern variation may be more to your liking. The s... Yes, a freestanding garage can become its own tiny house. Artist Michelle de la Vega has all the comforts of a modern resi... There’s nothing like a new set of cabinet hardware to refresh a room. The possibilities are endless: Go modern, rustic, or... Pursue what's known as the stack effect. To achieve it, open the windows on both the upper and lower floors, and as warm a... Like no other floor type, a checkerboard design works wonders to underscore the retro kitchen theme. Vinyl flooring, ceram... Twine lanterns add pops of crafty—but sophisticated—flair to any outdoor setting. Wrap glue-soaked twine around a balloon ... When securely fastened to a tree or the ceiling of a porch, a pallet and some cushioning make the ideal place to lounge. V... Incorporate nature into your lighting scheme by securing a dead tree in a concrete mold and draping your pendant lamp from... For the cost of a can of exterior paint , you can totally transform your porch. Paint the floor a hue that complements yo... In this urban apartment, a standard-issue patio became a serene and green perch by replacing the typical concrete with gro... If you put the washing machine in the mudroom, you can stop the kids from walking through the house in dirty, grass-staine...
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon