Interior drainage system – different approaches

Interior · Wet Basements and Crawlspaces · printed page 372 (PDF page 373)

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Different Approaches

Text in the illustration

Interior drainage system – different approaches waterproof coating or membrane on interior wall a hole is drilled at the bottom of every block core slab is removed along edge of wall, and a drainage channel is added in the bottom part pipe from drainage channel to sump pit waterproof coating or membrane on interior wall drainage channel along edge of wall, fastened to floor drainage channel connects to sump pit sump pit interior drainage pipe dimpled plastic sheeting forms drainage plane concrete removed and replaced at perimeter pipe carries water from perimeter drain to sump pit sump pit
waterproof coating or membrane on interior wall
a hole is drilled at the bottom of every block core
slab is removed along edge of wall, and a drainage channel is added in the bottom part
pipe from drainage channel to sump pit
drainage channel along edge of wall, fastened to floor
drainage channel connects to sump pit
sump pit
interior drainage pipe
dimpled plastic sheeting forms drainage plane
concrete removed and replaced at perimeter
pipe carries water from perimeter drain to sump pit

Generated explanation

Three cross-sectional details illustrate different interior basement drainage arrangements that direct water to sump pits. The upper detail shows holes drilled at the bottom of concrete block cores, an interior waterproof coating or membrane, and a drainage channel installed in a removed strip of slab beside the wall. The lower-left detail shows an interior wall coating or membrane and a drainage channel fastened to the floor along the wall, with a connection to a sump pit. The right-hand detail shows dimpled plastic sheeting forming a drainage plane against a block wall, leading to an interior drainage pipe below the slab perimeter. Concrete is removed and replaced above this perimeter drain, and a connecting pipe carries water to the sump pit; blue arrows indicate water movement.

Components

foundation walls concrete block cores foundation footings basement floor slab interior waterproof coating or membrane block-core drainage holes interior drainage channels interior perimeter drainage pipe dimpled drainage sheeting sump connecting pipes sump pits

Materials

concrete concrete masonry blocks waterproof coating or membrane dimpled plastic sheeting drainage aggregate

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