Question: Contractor cemented roof downspout into new concrete patio (drains under patio). Kitchen hardwood floor soaked after rain. Patio washing also suspect. Cause?
Water likely backs up downspout, overflows at house wall, leaks into kitchen and/or pools under patio.
Remove downspout from patio; install new one connected to pipe draining safely away (surface or under patio). Patio underside is not a disposal point.
To run under slab: bore horizontal hole (chisel-point PVC, dig trench, push/twist, or rent horizontal boring machine). Use burial-rated pipe (rigid or rated corrugated).
Patio washing water may contribute. Never drain roof water immediately at foundation or under patio.
—Mark Harshman | mahdrafting.com
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