Footing Drain Question

chrisk

I'm doing a garage addition on a slightly sloping small city lot in Seattle. The garage floor slab will be at finish grade and the footing is 18" below the top of this slab. Must a footing drain be installed along the footing or can it be installed at or below the basement slab along the foundation wall? If it is installed at the footing I can not drain to daylight, but if it is installed along the wall just below the elevation of the slab i can drain to daylight.

Thanks for your help,
Chris

tgeb

I'd say you will be fine installing it as you are talking about, (just below the level of the slab), I would back fill and compact the soil to the level you want the drain so that you don't have water hanging out in the stone that would be below the level of the day-lighted pipe.

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Tom

www.gebcon.com

Vinny

I'm not sure I understand here. You dont need a footing drain for a slab and foundation to footings since there is no basement.

If you are refering to the adjacent house basement you are attaching to then yea, I geuss it would be ok to put the pipe just below the slab as the max water hieght will be captured by the pipe prior to entering the basement but just as a reminder, the lower the better.

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Forry

Don't know the regs. in Seattle, but in Eugene, Or. we also get tons of rain, and the city won't let us drain the perimeter to daylight, we have to drain to the city storm sewer, ie. the street. if it's not possible to drain to the street, we have to have a drywell engineered. I'd check with the city about code requirements.

chrisk

the slab is at grade at the entrance but the other end will be 36" below grade... so the garage cuts into the slope.

tgeb

So are you saying that you have foundation below grade, but above the slab in the rear and side but not the front?

I would make sure those walls are waterproofed and proceed as outlined previously, as long as all of your drain is below slab height, and be sure to comply with local code.

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Tom

www.gebcon.com