How to seal basement service penetrations.

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How to repair or replace a damp proof course.

How to seal basement service penetrations.

It’s one thing to design a waterproof basement but have you considered how services are going to enter the structure?

It’s not unusual for services such as gas mains, drainage pipes or event electrical wires to be designed to enter the basement through the slab, the retaining walls or even in through buried soffitts.

The first question should be, can these services be moved so that they enter the building above ground?

Unfortunately this isn’t always possible especially in refurbishment projects or basement conversions where services are already in place.

Sealing within the structure.

Drainage pipes and service sleeves can be sealed within a new concrete wall or slab using a puddle flange. This is a rubber ring that fits around the round pipe to stop water running along the service penetration.

We often need to seal within the service penetration, around electrical cables in a service sleeve.

Koster KB Flex can be injected into the sleeve to stop water ingress quickly and permanently. This is an permanently plastic waterproof putty that will seal any space in the sleeve to stop water dead in its track.

Occasionally the concrete around the penetration is in poor condition. Voids in the concrete can be filled using Koster Repair Mortar Plus. This is an expanding waterproof mortar designed to repair below ground structures and seal the basement wall against water ingress.