Liquid Vapour Barrier System - Koster VAPlite

The Koster VAPlite system has been developed as a complete floor protection system for use in both basement areas subjected to hydrostatic pressure, and ground level or suspended floor slabs subject to short term or long term elevated relative humidity (RH) values. The Koster VAPlite system can provide a BBA approved negative side waterproofing, a quantifiable vapour barrier and a high strength self-levelling screed, all within a 10 mm build-up.  

Controlling the water vapour within the floor slab will:

• Prevent osmotic blistering or damage due to vapour drive for impermeable floor finishes such as resin or vinyl.
• Prevent re-emulsification of adhesives due to high moisture levels within the build-up.
• Protect moisture sensitive flooring such as wooden floors.
• Allow application of floor finishes in fast-track projects, where the RH value of the slab is too high for the intended flooring.

The VAPlite System includes the following steps:

Base coat:

For floor slabs subject to hydrostatic pressure: Polysil TG500 primer (impregnation) followed by 2 coats of Koster NB1 Grey, BBA approved negative side, crystallising, sealing slurry. For ground level or suspended floor slabs: Koster KB Pox IN, ultra-low viscosity epoxy impregnation to fill open pores within the concrete.

Vapour control:

All slabs: After 7 days, apply a single coat of Koster VAP I 2000.

Screed primer:

All slabs: After 24 hours apply one coat of VAP 06 Primer (for non-absorbent surfaces).

Screed:

All slabs: Koster SL Premium, high strength, self-levelling screed is applied between 8 mm and 15 mm to provide a level, hard wearing surface to receive any flooring finish and protect the waterproofing and vapour control layers below.

System build-up:

Basement:

1. Köster Polysil TG500 (impregnation).
2. Köster NB1 Grey (approximately 2 mm).
3. Köster VAP I 2000 (adds approximately 0.2 mm).
4. Köster VAP I 06 (approximately 100 microns).
5. Köster SL Premium (8–15 mm as required).
6. Floor covering/ coating (as required).

Above-ground:

1. Köster KB Pox IN (impregnation).
2. Köster VAP I 2000 (adds approximately 0.5 mm).
3. Köster VAP I 06 (approximately 100 microns).
4. Köster SL Premium (8–15 mm as required).
5. Floor covering/ coating (as required).

Features and benefits:

• Thin layer build-up, 8–15 mm, making the system suitable for new and existing areas.
• Suitable for concrete slabs with no underside DPM (damp proof membrane) or WPM (waterproof membrane).
• Permanently withstands an elevated moisture level in the concrete of up to 100% relative humidity (RH).
• Resistant to a permanently aggressive environment with pH values up to 14.
• Suitable for all flooring types, even moisture sensitive finishes, in basement areas.

Please contact the Koster Technical Team for more information on the system or assistance with specification - technical @kosteruk.com.