Void filling for waterproofing and insulation purposes from inside out
Cracked and damaged walls can be permanently sealed by void filling. Voids such as those particularly present in brick walls are filled by injection. The choice of grouting material used depends upon the objective. If a crack in a ‘hard-working’ wall requires sealing, an elastic grout is used. For insulation purposes however, a light foam is injected.
When employing injection techniques to repair cracks and fill voids utmost precision is required. The holes for the injection lances are bored on alternate sides of the crack. The distance between them depends on many factors. Crack width and the thickness of the element play just as much a role as the viscosity of the grout and its temperature-dependent working time.