Sequentially applied horizontal barrier with liquid injection material
In the case of damage from capillary rising dampness there is the possibility to install a sequentially horizontal damp proof barrier in the masonry work. Dependent on the thickness of the masonry and degree of moisture penetration the pressure injection method provides for this purpose. Here holes are drilled every 10–12.5 cm centres into the masonry. The bore holes are drilled level in the horizontal pointing or positioned at a 45 degree angle. The depth of the bore hole should be approx. 5 cm less than the thickness of the masonry. The injection material is injected under pressure into the substrate using appropriate injection packers. In this way the injection material is pressed into the pores in the building material and forms a hydrophobic (water repellent) level so that moisture can no longer be transported upwards by the capillaries. In case of a low degree of water penetration injection using pressureless techniques is possible. The material is tested and certified in accordance with the WTA data sheet (“Masonry injection against capillary moisture“) to a saturation rate of 95%.
In order to optimise the spread of the horizontal damp proof barrier, brush apply AQUAFIN-1K to a height of approx. 10 cm above the planned row of bore holes.
Fill voids and defects in the substrate with the bore hole mortar ASOCRET-BM.
After drilling the bore holes (bore hole distance between 10–12.5 cm) inject AQUAFIN-F under low pressure (<10 bar) via injection packers into the substrate. Maintain the injection pressure until the neighbouring areas to the packers show signs of glistening. After approx, 24 hours remove the packers and close off the holes with ASOCRET-BM, With very porous masonry work it can also be carried out from one side.
With pressureless techniques connect the appropriate holding tank in the bore holes and fill with injection material. Dispersion into the substrate happens exclusively by gravity and the absorption of the substrate. Continue with the filling process until the injection material is no longer absorbed. Closing off the bore holes is carried out, as in the pressurised techniques, with the bore hole mortar ASOCRET-BM.