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Old 10-19-2010, 11:31 AM   #1
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french drain waterproofing basement


We are replacing our french drain. The slab is approximately 10 feet down. I have read so many different things about waterproofing I am not sure what to do. There is foam insulation about 4 inches thick on the foundation wall currently. Should we get a strong pond liner or plastic and lay that over the foam? How would we make a french drain if we do that? Will a french drain work if it is that deep? Do we gravel all the way to the top of the soil? We have tried to get a contractor but we live in the middle of nowhere arkansas and haven't been able to get one. Thanks for any answers
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Old 10-19-2010, 12:03 PM   #2
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1st, inside or outside ? for best results, the drain pipe should be placed alongside the footer for both,,, IF your drain cannot run to daylight ', you'll need a pump & sump for both, too,,, we use miradrain to cover/protect the exterior troweled-on waterproof coating ( typically sonneborn ' sonolastic ' altho asphalt-based roofing cement will work, too.

our ' gravel ' is clean/washed crushed #57 stone - you're welcome

Last edited by stadry; 10-19-2010 at 12:28 PM.
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Old 10-19-2010, 01:04 PM   #3
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Gravel the full height of the excavation except for a few inches for top soil at the top. This will collect the moisture from the soil so you get rid of it and reduce the pressure on the wall.

The less water, the less pressure to force water through any weak point the less structural load on the wall.

If it was not for the lateral soil pressure, you could build a basement wall out of 6" concrete block.

Dick
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Old 10-19-2010, 01:12 PM   #4
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Thank you for taking the time to answer.
Its outside. The existing foam has a black covering on it but has been damaged in many places. Could we put trowel on waterproof on the foam?

We paid someone to dig the trench but they were unable to dig deep enough.
Now we have to dig it again and of course it is going to be quite wide. Should we just fill the whole 6 foot trench with rock?
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Old 10-19-2010, 01:24 PM   #5
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we can expect that coating to be the code-required asphalt-based emulsion ( water/asphalt mix ),,, clean it well & trowel on your wtrproof coating then protect w/( miradarin - deltadrain ),,, dick's absolutely right on the backfill of stone.

EXTREMELY IMPORTANT - WORKING IN A TRENCH CAN BE DEADLY BECAUSE OF COLLAPSING EARTH - WORK IN NOTHING MORE THAN 4' DEEP - SHORE THE SOIL & SLOPE TO 1:1 GRADE - FOR EVERY FOOT DEEP, THE EXCAVATION MUST BE 1' WIDE - eg, 5'deep less the 4' = 1' wide, 6'deep, 2'wide - width is measured from top of trench,,, pro work calls for a ' competent person per OSHA regs,,, homeowners can commit suicide at their discretion BUT not at the danger to any OTHER person !
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Old 10-20-2010, 08:54 PM   #6
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Quote:
Originally Posted by itsreallyconc View Post
we can expect that coating to be the code-required asphalt-based emulsion ( water/asphalt mix ),,, clean it well & trowel on your wtrproof coating then protect w/( miradarin - deltadrain ),,, dick's absolutely right on the backfill of stone.

Quick question for you IRC: Would you suggest removing the foam, damproofing directly on the foundation, and then using the foam to protect the damproofing. I do like the fundamentals behind the Miradrain, but it just seems overkill in complete stone bakfill.

EXTREMELY IMPORTANT - WORKING IN A TRENCH CAN BE DEADLY BECAUSE OF COLLAPSING EARTH - WORK IN NOTHING MORE THAN 4' DEEP - SHORE THE SOIL & SLOPE TO 1:1 GRADE - FOR EVERY FOOT DEEP, THE EXCAVATION MUST BE 1' WIDE - eg, 5'deep less the 4' = 1' wide, 6'deep, 2'wide - width is measured from top of trench,,, pro work calls for a ' competent person per OSHA regs,,, homeowners can commit suicide at their discretion BUT not at the danger to any OTHER person !

Excellent warning.
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Old 10-21-2010, 05:33 AM   #7
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thought about that, jo, & you're right, of course - it would be best to place the trowelable membrane directly on the foundation wall,,, however, i suspect the original jabonies uses something to ' hold ' the insulation in place while they backfilled,,, even they wouldn't have stood there while the machine pushed dirt back in,,, trying to remove it would probably destroy it.

jo, here's 1 for you - insulation doesn't warm or cool - it slows the ' run ' of heat to cold,,, place a 6pack of store temp brew in your ' go to church ' cooler ' & it won't get any colder, right ? therefore, why insulate below the frost line ? isn't ambient earth temp 65f ?

ps - think they filled in compacted lifts ? ? ? { me, neither ! }


you guys who can write in colors are my heroes
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