Foundation drain

[bannerd]

Hey all, work for my full basement is going well. Excavator dump some large stone for the concrete guys to pour on top of. In a U-shape they went around with 100ft of black corrugated perforated pipe. I know this is for drainage but I don't think this should be there now. I measured the basement and it would be right on top of the pipe, should the drain pipe be around the basement walls? Full basement at 8ft walls and solid floor. Also, the stone is golf ball size, I was thinking more crusher run but he said the bigger the stone the better the drainage will be and less erosion. I think he's right on that.

 

[p_mori7]

Yes it needs to be there, and it will be connected somehow...to a ditch or sewer or sump. It is there to prevent water from accumulating under & next to your foundation walls so no leaks or damage from freezing.

 

[bannerd]

Thanks!

 

[larry4406]

This is the standard detail the company I work for uses in homes in VA and MD.

The footing has pipes thru it (weep holes) every 6-8'. Hot tar waterproofing on outside of wall with draintile, stone, and filter fabric. Underslab the draintile runs perimeter and connects to sump crock. Inside filled with stone, vapor barrier, then slab.

sorry for the sideways image

 

[Doozer75]

The previously attached image (be it a bit small to see)
is correct. I run 4" perforated drains both on the inside
AND the outside of the footer. Connect them to the
sump pump pit.

---Doozer

 

[Chaznsc]

I don't normally see them under the slab. I guess it's a geographic variable.