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Foundation drain for Thickened Slab Building?

Foundation drain for Thickened Slab Building?

Foundation drain for Thickened Slab Building?

(OP)
I'm doing some work for a non-profit's new 900 square foot building.  The foundation is a thickened slab.  In our typical commercial work, I would always call out for a foundation drain around the perimeter of the thickened floor edge.  However, is it really necessary for such a small structure?  The building is up "high" and the ground is fairly permeable, so ground water should pass right through...

Any thoughts please... trying to save this non-profit some $$$.

RE: Foundation drain for Thickened Slab Building?

What is the purpose of the foundation drain in the first place?  I'm not sure you need such a thing.  Usually foundation drains are used to minimize lateral earth pressure on basement walls.

 

RE: Foundation drain for Thickened Slab Building?

It minimises water for heaving conditions and helps with the PEVB beneath the slab.  If it's located on a high spot and depending on the soil, it may be a simple matter of venting the perimeter drain to the side of the hill and adding some stone to reduce erosion if water's a problem.

Dik

RE: Foundation drain for Thickened Slab Building?

A perimeter drain is not normal practice in my experience. Therefore, based on that experience, I would say it is not necessary, unless there are particular, site specific, reasons for it.

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