Injection Mortar DPC 25kg

Details

Injection Mortar Application

Select the course to be treated - this should be at least 150mm above external ground level (BS Code of Practice 102). Unless structural considerations prevent doing so it is important that the DPC should be below the level of any timber floor. Installation should be in accordance with BS 6576:1985 Code of Practice for installation of Chemical DPC's.

Preparatory Works

Expose the line of the proposed DPC by removing all external render. Lower external ground levels where necessary without affecting the structural stability of the wall. Remove skirting and fixings and put to one side if sound, to be refixed. Inspect associated flooring timbers and joinery for fungal decay and treat if necessary. Remove internal plaster to expose the line of the proposed DPC. Plaster should be removed to a minimum height of 1 metre or 500mm above the last visible evidence of dampness. Advise interested parties of possible inconvenience eg. neighbours with party walls. Install safety notices and advise other trades of risks.

Injection Mortar Installation

Drill 19mm or 22mm holes at the intended DPC level at a downward angle of 30 degrees to a depth of approximately 4/5ths of the wall thickness. These holes should be drilled at 230mm centres. This should be repeated on the opposite wall surface ensuring that the holes are staggered giving overall maximum centres of 115mm. When drilling from one side the holes should be drilled at 115mm centres.

Following drilling the holes should be flushed out with water to remove bore dust and to ensure that the drilled holes are thoroughly wetted before insertion of mortar. Do not apply mortar to a dry wall.

Mix the mortar in the proportion of 3 parts water to 5 parts mortar by volume using cold water adding powder to water. Mix until a smooth cream consistency is achieved. Immediately fill the caulking gun with the mixed mortar and insert the nozzle of the caulking gun to the depth of the hole, the trigger action of the gun will gradually push the nozzle out ensuring that no air gaps are left and that the hole is filled to its full depth.

Only mix enough mortar for 20 minutes work and ensure that the caulking gun is kept clean and that any run down of mortar on wall surfaces is removed immediately with clean water.