Radon gas barriers applied in liquid form offer many advantages over barriers based on prefabricated sheets: total continuity (absence of joints), very low permeability to this gas and an easy and quick application.

Krypton Chemical, S.L. proposes two coatings for this type of application:

1. Pure polyurea for hot application, Rayston Spray D50 is specially designed to be applied in the foundations of new constructions. It can be applied adhered, or also in a floating form (no need of previous support preparation) together with the special Geomax Spray 200 geotextile (NMDC system, unique in the market).

1. Impermax 2K M is a cold applied, solvent-free, elastomeric polyurethane specially designed for small repairs and sealing in existing constructions where it is necessary to reduce the inflow of radon gas.

Both coatings perfectly meet the requirements of the Spanish standar CTE, DB H S6. So, if applied at a thickness larger than 2 mm. as they have got a diffusion coefficient lower than 10¯¹¹ m2/second, they are suitable as barriers to radon gas.

Case study: Refurbishment of a terrace with decorative colored quartz finish (Portugal)

We present a case study where two construction needs have been optimally solved in a single intervention.

1. On the one hand, infiltration problems were solved with the help of an elastomeric and continuous membrane applied in liquid form, using Impermax SF (solvent-free).

2. In addition, a new highly resistant and decorative finish was created for the terrace, thanks to the colored quartz, sealed with a transparent Colodur resin.