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deflig 09-05-2011 05:03 PM

foundation coating
 
I am about to install a french drain on the one side of my house. since I am going to be digging for the drain and will have the foundation exposed should I apply a membrane or other type of coating to the exposed below ground level foundation

concretemasonry 09-05-2011 05:12 PM

Make sure the drain tile is below the bottom of the footing. That is more important than the type od coating since it reduces the amount of water and pressure.

Why just one side? Are you assuming the water is actually coming from where you may see it show up on the inside. Water has a habit of flowing horizontally. There are many different coatings with different claims and applications.

Dick

stadry 09-06-2011 06:13 AM

all french drains must include either gravity OR mechanical discharge otherwise you're building a retention pond next to your very fine home :laughing: for the $$$, roofing cement is the best foundation coating w/miradrain protection on top.

Knucklez 09-12-2011 08:04 PM

4 Attachment(s)
Quote:

Make sure the drain tile is below the bottom of the footing.
are you sure it is wise to dig BELOW the foundation footing?

concretemasonry 09-12-2011 08:43 PM

Perforated PVC drain tile should have the invert (bottom) below the footing. This is not difficult since the intent is for the PVC pipe to be below the footing bottom AND outside the bearing area of the footing that extends downward and out from the bottom of the footing. - In other words, if the center of the PVC pipe is 6" away from the face of the footing, it can be 6" below the bottom of the footing.

Remember it is always to good to have properly graded aggregate (not just clean rock, but some clean sand blended in) for 4" below the bottom of the perforated PVC pipe. The pipe can be level since water will find its discharge if the pipe is level with no dips. This satisfied the requirement for a gravity discharge. Corrugated pipe is easy to be sloppily installed with dips the collect clay and silt deposits at the low points or between corrugations, so it may not be a true gravity discharge.

Dick


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