Clay Soil In Crawl Space - Landscaping & Lawn Care - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Landscaping & Lawn Care


Thread Tools Display Modes
Old 07-20-2012, 03:52 PM   #1
Join Date: Jul 2012
Posts: 1
Rewards Points: 10

clay soil in crawl space

We have clay soil in the crawl space under the house. One section is damp and probably caused from the sprinklers outside the house. We are going to move the sprinklers but how can we improve the soil in the crawl space to soak up the moisture and prevent future water from pooling?


shannonsull is offline   Reply With Quote
Old 07-21-2012, 05:18 AM   #2
WickedWarrior88's Avatar
Join Date: Jul 2012
Posts: 3
Rewards Points: 10

Add sand to the clay. Sand will soak up water. But make sure you mix it into the clay and deep enough to handle heavy rain.


WickedWarrior88 is offline   Reply With Quote
Old 07-21-2012, 06:18 AM   #3
Join Date: Nov 2007
Location: Nashua, NH, USA
Posts: 7,822
Rewards Points: 3,750

You need to regrade the land so water flows away from the house.

Mixing clay surface soil with sand is more suited to preparing the soil for planting as opposed to controlling flooding. Once soaked into the soil the water still has to go somewhere.

Excavating the first 12 to 18 inches in from the perimeter all the way down to the footing bottoms (or down to more porous subsoil if you get there first) and backfilling with pure sand or gravel is superior to taking up a layer of clay soil over the entire area of the crawl space and mixing with sand.

Do not excavate all around a column footing such as used for deck support posts or houses on stilts. I am guessing that it is safe to excavate up to a column footing no more than on two opposite sides not getting within 18 inches.
States can help recovery from hurricanes and tornadoes by not requiring due digence or prompt and timely correction of substandard conditions, and by providing continued liability insurance where companies drop homeowners.

Last edited by AllanJ; 07-21-2012 at 08:34 AM.
AllanJ is offline   Reply With Quote
Old 07-26-2012, 04:06 PM   #4
Wire Chewer
Red Squirrel's Avatar
Join Date: Jun 2009
Location: Ontario, Canada
Posts: 3,286
Rewards Points: 2,150

May have to redo the weeping tiles and foundation seal.... I just went through that, not cheap! You could also try regrading and that alone may help. is it only when you use the sprinkler or when it rains too? But redoing weeping tiles is best bet. At some time you'll get all that clay out of there as there is probably clay right up against the house, it does not absorb water as well.
Red Squirrel is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Bad smell in crawl space. John_W General DIY Discussions 34 06-03-2014 12:57 PM
Air Barrier in crawl space biglurr54 Insulation 6 01-15-2012 08:50 AM
mushroom in crawl space!??!! cbzdel General DIY Discussions 2 09-24-2010 05:01 AM
Cement crawl space ventilation sheslostcontrol HVAC 9 05-22-2010 08:32 AM
Insulating crawl space jenoble99 Building & Construction 10 06-18-2009 12:09 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1