Is this estimate reasonable to remove water under house?

davenMay 27, 2008

We have developed standing water under our crawl space. Our house is in NC in a humid area. We have a pair of dehumidifiers under the house to reduce the moisture level.

When we had the situation evaluated, the company stated that we did not need fans venting the crawl space outward and that because the vents had not been well sealed we were running the dehumidifiers too hard.

They proposed:

250 linear feet of french drain along inside footers

3/4 hp sump pump

6 mil vapor barrier

150 ft. drainage pipe to outside drainage ditch

24 new foundation vents and sealing of vents

The work is expected to take 2 days to complete. The initial estimate was $6780. When he saw our jaws drop, the estimate was reduced to $6,200.

Is this in the ballpark for this type of job? Should it solve the problem?

Thank you for reporting this comment. Undo

What I don't get is, why are they putting vents in and then sealing them?

    Bookmark   May 28, 2008 at 1:00PM
Thank you for reporting this comment. Undo

They have to remove the existing vents to get the rock under the house.I assume that they will be ruined by removal and need replacement.

I've checked in the yellow pages and I can't find a category for companies that do this kind of work. I'd like to get another estimate or some guidance.

    Bookmark   May 28, 2008 at 9:37PM
Thank you for reporting this comment. Undo

If I may ask:

where is the water coming from, up from the ground or the humid air?

what kind of floor does the crawl space have, concrete, dirt,...?

    Bookmark   May 29, 2008 at 10:12AM
Thank you for reporting this comment. Undo

I believe that the ground is the predominant source. We have sandy/clay soil covered by a 4 mil vapor barrier.

    Bookmark   May 29, 2008 at 12:40PM
Thank you for reporting this comment. Undo

If it is ground water the first four items on your list should take care of it. On the last item, the vents, I hesitate because if you run dehumidifiers you should seal the area. If you have vents you should insulate the floor and not run dehumidifiers.

Doesn.t do any good to run air conditioning if the door is wide open and basically thats what a dehumidifier does.

    Bookmark   May 29, 2008 at 6:04PM
Thank you for reporting this comment. Undo

Vented crawlspaces are on leading building scientist Dr. Joe Lstiburek's Top Ten Dumb Things to do in the South

Here is a link that might be useful: Designing Closed Crawlspaces

    Bookmark   June 15, 2008 at 10:48AM
Thank you for reporting this comment. Undo

What if you have a slab and you think there is a creek or pockets of water which shift as the ground shifts?

    Bookmark   July 10, 2011 at 4:09PM
Sign Up to comment
More Discussions
Ceiling insulation in basement
We are finishing our basement and I am getting to the...
making the crawl space more useful?
My house has a (vented) crawl space between 2 and 3'...
want to finish basement but very humid...
Have an unfinished basement. House built 2012. During...
Easier way to burst up concrete?
Since it seem I have to do some concrete busting work...
Basement tile grout sweating
Hi Experts, We have a new house (1 year old, Hamilton,...
Joe Regular
Sponsored Products
Barcelona Satin Nickel Outdoor Downlight
$100.95 | Bellacor
Eagle One Products 47 x 17.5 in. Deck Box Cushion - C395B418
$201.99 | Hayneedle
Under-Shelf Basket
$7.99 | zulily
Mediterranean Tilework Square Blue Outdoor Pillow
$99.00 | FRONTGATE
Florence Knoll Style Loveseat-Oatmeal Tweed
IFN Modern
Hopson Leather Ottoman - Brighton Ciment Gray
Joybird Furniture
Esprit-V Adjustable Coffee Table by Domitalia
$1,401.12 | Lumens
House of Troy Oxford 16" Wide Nickel Picture Light
Lamps Plus
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™