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Old 08-30-2009, 09:52 PM   #1
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proper location of outside drain tile

guy building basement says put the drain tile on TOP of the footing outside the block.

My way of thinking is tile should be down level with BOTTOM of footing plus sloped 1 inches per 10 foot or so toward sump hole,,,but that would require considerable digging yet.

what happens if its layed on outside footing??good or bad things??
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Old 08-30-2009, 09:59 PM   #2
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As long as the drain tile is at least a foot lower than the basement floor, it can go on top of the footing. The important thing is that the tile be correctly installed, i.e. in a trench filled with crushed stone, pipe surrounded by filter fabric, holes facing down, pipes gently pitched (1 percent is fine) toward the sump. In New England where I live, the top of the footer is not always lower than the basement floor, in that case you need to put the pipe in deeper.
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Old 08-30-2009, 10:02 PM   #3
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Old 08-30-2009, 10:16 PM   #4
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The holes should be on the bottom of the perforated tile (4:00 and 8:00).

If you just are draining it into the sump level is fine since water will flow to the sump without a slope. Sloping a perforated pipe surrounded by sand and rock is really not needed. If it is perimeter drain, the pipe should have the bottom (invert) at the level of the bottom of the footing with some permeable sand and rock mixture under and around it. If you are lucky enough to be doing an interior installation, try to run a continuous loop and clean-outs for flushing if it happens to silt up.

If you are trying to get the water away, the pipe should be sloped and solid (without holes). If it is for distribution into another are, run sloped solid pipe to the area and then switch to perforated and surrounded by sand/gravel to distribute water.

Beware - If the area is subjected to high water levels, there is the possibility of the flow being reversed depending on the exterior water level and the duration.

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