Dryzone installation instructions
1.1 Drill hole size, depth and location.
For treatment treatment to be fully effective the correct volume of Dryzone must be inroduced. The system requires 12mm diameter holes to be drilled at horizontel centres no greater than 120mm. The depth of the hole required for various thickness of wall is shown in the table below. For all other walls the depth of hole should be to within 40mm of the opposite face. In all cases the most effective target site is to drill horizontally, directly into the mortar course, preferably at the base of all perpends of the course selected.
As necessary remove skirting boards and/or render/plaster to identify and expose the appropriate course to be targeted for the injection of the Dryzone. Measure the thickness of each wall to be treated. Set the depth gauge of the drill or apply to the drill in order to identify the correct drilling depth accordingly.
1.3 Solid brick walls
In virtually all cases solid brick walls may be drilled and treated with Dryzone from one side in a single operation. Drill the selected mortar course at the prescribed centres to the appropriate depth in accordance with above
1.4 Cavity walls
Cavity walls may be drilled and treated with Dryzone from one single operation or if preferred each leaf may be treated with Dryzone separatly. When undertaking treatment from one side drill completely through the selected mortar course , allow the drill bit to pass across the cavity and then drill the other leaf of brickwork to a depth of 90mm. The viscosity of Dryzone is such that it is possible to treat each leaf from a single drilling operation. Always ensure that the cavity is clear before treating with Dryzone.
1.5 Random stone and rubble infill walls.
As far as practically possible follow the mortar course at the appropriate selected level to be treated with Dryzone. If the stone is of porouse type e.g. sandstone the there is no reason why this can not be drilled and treated with Dryzone. The variable thickness of stone walls and the possibility of rubble infill dropping and blocking injection holes cause difficulties for any system. Should these difficulties occur it may be necessary to drill to 50% of the wall thickness from both sides at the corresponding height to be treated with Dryzone. Alternatively drill additional holes adjacent to obstructed holes to ensure that adequate volume of Dryzone is introduced.
2.0 The injection process and making good.
2.1 Dryzone injection
Insert delivery tube of Dryzone application gun into the full depth of the pre-drilled hole. Squeeze the gun trigger and back fill each hole fully with Dryzone to within one centimetre of the surface. when treating cavity walls from one side make certain that the holes in each leaf are filled. Dispose of used cartridges in a plastic bag in accordance with local waste disposal regulations.
2.2 Making good
All drilled holes treated with Dryzone should be pointed over.
In common with all remedial damp proof course systems the adequate removal and correct replastering of internal salt contaminated plaster is an essential requirement.