01992 523 523MENU

Internal Waterproofing

DELTA offer a range of internal waterproofing products and systems, to not only stop water from entering your basement/property but also to manage and control it.

The DELTA internal ‘Type C’ waterproofing system consists of two main components, the cavity drain membranes, and the specialist drainage, such as sump pump stations, perimeter drainage channels, or our 129 drainage detail. (Technical details at bottom of this page)

internal basement waterproofingThe cavity drain membranes act as the internal barrier that is wrapped around the walls, laid across the floor and sealed using the Delta systems range of adhesive products. The studded profile on these membranes create a cavity that allows water/water vapour to collect and drain to a drainage system i.e. sump pumps.

There are two main types of specialist drainage systems, the perimeter channel system, and our 129 drainage detail, which is designed into the new slab using 110mm drainage pipe, with upstands, one inlet for every 12m² of floor area, (See technical drawings below). The water is drained to one of our sump-pump stations that pumps the water out of the basement externally.

As well as waterproofing existing basements, DELTA products can also be used in new construction. Properties undergoing refurbishment frequently have basements that will need upgrading so they can become drier and then converted into there desired room. These basements may be used for storage, offices, bedrooms, games rooms, toilets, etc. which all require different levels of dryness. Buildings/structures aren’t always dry, water and water vapour will always exist.

basement conversionTo make your basement fit for refurbishment you must have control of the moisture and water that’s in the actual building structure and also the humidity and temperature, each of these will prove vital to rid your basement of any dampness and maintain a dry building. To achieve this you need to apply a waterproof coating inside the walls and floors, this needs to be done before insulation or decorating. Once the room is waterproofed/damp-proofed the air needs conditioning to maintain the right levels of humidity through sufficient ventilation or air conditioning. If this specification is not met then any moisture in the home will cause the humidity levels to rise.

Areas below ground level are prone to condensation, occurring on the coolest surface so steps must be taken to prevent condensation causing problems. DELTA have the right products for all your needs.

Typical detail of our internal ‘Type C’ waterproofing system

DELTA®-MS500 on the walls fixed with Qwik-Seal PlugsDELTA®-MS20 on the floor, both sealed with Tape and Corner strip at the joints. DELTA Drainage Channel is installed around the perimeter of the room collecting the ground water draining away to a Dual V3 Sump Pump. (Click image below to view technical detail)

Internal basement waterproofing


Maintenance of Type C systems and most important pump maintenance is essential and regular servicing is required to ensure pumps do not fail and the cavity membrane does not block. Potential build up of free lime could occur especially where new concrete is present in the basement construction, this can be treated with an anti lime primer as part of a Type A system. Built into the drainage design flushing ports and access panels are to be incorporated at the required points, ask a member of our technical team for specific detailing. Click here to view our flushing port/access panel detail.

DELTA floor drain design 129 using 110mm soil pipe – drainage points across slab (click image below to view full technical detail)

modular drainage

For any queries on cellar drainage equipment, basement waterproofing solutions or structural waterproofing systems please contact us.

Get in touch