Water penetration due to subgrade soil conditions

Exterior · Lot Grading · printed page 339 (PDF page 340)

Book index entries

Soil Conditions – Causing Water Leakage Water Leakage – due to Soil Conditions Exterior – Grading Grading – Exterior Lot Grading

Text in the illustration

even though the grading around the house appears appropriate, the downspout discharge percolates down to the clay layer and collects next to the foundation where it may find its way into the building
wall framing
downspout
floor framing
foundation wall
porous soil (e.g. sand)
water flow
impervious soil (e.g. clay )
perimeter drainage tile
basement

Generated explanation

The cross-section shows a basement foundation wall, footing, floor slab, perimeter drainage tile, and wood wall and floor framing above. A downspout discharges onto porous soil at a surface that slopes away from the house. Beneath the porous soil, an impervious clay layer slopes toward the foundation. A heavy arrow shows discharge water percolating downward, following this buried layer toward the wall, and penetrating into the basement despite apparently appropriate surface grading.

Related illustrations

1892

Water penetration due to subgrade soil conditions

· p. 341

The illustration shows a section through a house foundation, basement, and adjacent soil, with a downspout discharging onto ground that slopes away from the building. A porous soil layer overlies an impervious layer that