Structures that are earth retaining can be damaged by moisture penetration from the outside or by the water under hydrostatic pressure. To combat this, Delta Membrane Systems offers DELTA GEO-DRAIN Quattro.

Offering high levels of reliability with thick viscoplastic coatings, DELTA GEO-DRAIN Quattro features a micro-perforated slip film which – together with the additional filter cloth – acts as a backup drainage layer behind the dimpled sheet. This ensures any water is safely drained off.

The slip film has the added benefit of preventing the transmission of movement to the waterproof coating.

Installation is simple and straightforward. Supplied in roll-form, DELTA GEO-DRAIN Quattro is applied to the waterproofed surface without any need for special grade backfill.

An integrated self-sealing edge ensures precise installation, and a specially design drainage/holding clip is also available to speed up the installation process and promote effective drainage.

It has the added benefit of effectively draining off methane and radon gases.
Standard roll size for the Quattro is 12.5m x 2m, and it offers a compressive strength of some 400kN/m2. Drainage capacity is 3.1 l/s/m.

It can also be used in a wide range of other domestic, commercial, industrial and retail applications, and is finding increasing popularity in the education and healthcare sectors where refurbishment of older properties necessitates effective damp proofing.

The product is also widely specified for new-build work where dampness could be a problem owing to the adjoining land or climate conditions.

Durability is a key feature of DELTA GEO-DRAIN Quattro. It will work effectively for at least 25 years in natural soil having a pH value between 4 and 9, and a soil temperature of up to 25OC.