Crack repair – epoxy and polyurethane injection

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

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Epoxy and Polyurethane

Text in the illustration

polyurethane is flexible and is not a structural repair, however, it can prevent leakage it starts out with low viscosity, then expands and hardens in the crack do-it-yourself crack repair kits usually feature polyurethane foam epoxy is as strong as concrete and forms a structural seal however, it hardens slowly, and if there is space at the back of the crack, it may leak out Crack repair – epoxy and polyurethane injection epoxy or polyurethane may be injected into the wall through ports the ports are inserted into the crack, and the front of the crack is sealed then, the repair material is injected through the ports mastic basement slab this method can only be used with poured concrete, not concrete block foundation wall note:
foundation wall
polyurethane is flexible and is not a structural repair, however, it can prevent leakage
it starts out with low viscosity, then expands and hardens in the crack
do-it-yourself crack repair kits usually feature polyurethane foam
epoxy is as strong as concrete and forms a structural seal
however, it hardens slowly, and if there is space at the back of the crack, it may leak out
epoxy or polyurethane may be injected into the wall through ports
the ports are inserted into the crack, and the front of the crack is sealed
then, the repair material is injected through the ports
mastic
basement slab
note:
this method can only be used with poured concrete, not concrete block

Generated explanation

The illustration shows a poured-concrete foundation wall with a jagged vertical crack above a basement slab. Injection ports are inserted along the crack, and mastic seals its exposed face before epoxy or polyurethane is injected through the ports. The annotations explain that polyurethane expands and hardens to prevent leakage but remains flexible and is not a structural repair. Epoxy forms a structural seal but hardens slowly and may escape if there is space behind the crack. A note limits this repair method to poured concrete rather than concrete block.