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Sealing of Masonry

Post-construction damp-proof course (dpc) against capillary rising moisture and construction sealant

Sealing of masonry with dpc and other measures

Masonry with ground contact is exposed to varying moisture stresses. Moisture penetration is prevented by means of sealing measures during the construction phase. However, building defects, changing conditions and aging of the material used may lead to moisture penetration into the masonry at a later point of time. 

This temporary or permanent moisture damage can be repaired by post-construction sealing measures on the masonry. To do so, reaction resin is introduced into the porous construction material. It then forms a barrier over the entire cross section upon conclusion of the curing process. The water in the capillary and porous structure of the building material is displaced and permanently replaced by the sealing material by means of pressure injection. This includes the installation of a post-construction damp-proof course against capillary rising moisture. 

Masonry sealant by means of dpc

In case of moisture-related problems in masonry, a damp-proof course is important to permanently protect building structures from damage. It prevents the capillary rise of soil moisture in the masonry. Thanks to the targeted use of PU injection resins in combination with PU injection foam resins an efficient damp-proof course can also be obtained in water-saturated masonry, masonry full of cavities and masonry exposed to salt-related stress.

An efficient masonry sealant is also necessary for the successful drying of building structures.

WEBAC products for sealing masonry

WEBAC offers a wide range of special products for sealing masonry:

PU injection foam resins
Quick-foaming polyurethane injection foam resins (PU foam) are specially designed to fill the essential parts of masonry full of gaps and cavities. Upon contact with water, the resins form a foam of fine cellular structure during a very fast reaction which fills all free volumes and also displaces the water from the building structure. Thanks to the intensive mixing process, a barrier forms very quickly, especially with pressing water.

PU injection resins
Permanently sealing capillary obstruction is achieved by pressure injection of low viscosity, 2C PU injection resin. This material is suitable for almost any type of masonry and can also be used for water-saturated structural elements. PU injection resin spreads in gaps, cavities, cracks and pores. It fills these completely and adheres very well to the mineral building materials. PU injection resin can also be used as damp-proof course against capillary rising moisture.

PU casting foam resin
To improve thermal insulation and watertightness, PU casting resin can be used for filling cavities. This applies to two-shell masonry, wooden structures as well as to wall breakthroughs and similar sealing tasks. Cast resin is also suitable as abutment for a post-construction damp-proof course against capillary rising moisture.

Surface sealing
Our special bitumen-acrylate dispersion is used for sealing surfaces in undergrade or freely accessible building structures. This bituminous coating reliably seals structures against water pressure of up to 6 bar at a film thickness of only 1 mm.
Polymer-modified high-build bituminous coatings are suitable for sealing surfaces against non-banked-up seepage water, non-pressing water and banked-up seepage water for vertical and horizontal surfaces.

Curtain injection
The post-construction surface sealing of structural elements with ground contact can be effected by means of curtain injection, if conventional external sealing measures are not feasible.