Newton Newtonite 803 MESH Damp Proof Membrane Kit (With Fixings & Sealing Mastic)

Preparation:

Clean the substrate to remove all loose debris and organic matter. Plaster should be removed as it can soften over time, which will weaken the fix of the membrane to the wall. If the wall render is in good condition, it does not have to be removed and the Newton 803 Newtonite can be fitted directly over. If the render is damaged, local repairs may be required.

Loose or crumbling render should be removed and local repairs made. If the render is in very poor condition, all of it may need to be removed.

Obtain as flat a surface as possible. If the wall is undulating, better results are produced if the wall surface is dubbed-out flat with sand & cement prior to installation of the membrane, rather than dubbing out over the top of Newton 803 Newtonite. A flat, uniform surface to the substrate means that the plaster or render above Newton 803 Newtonite will also be uniform and less likely to have cracking caused by differential thicknesses.

If evidence of bacterial growth can be seen, use a fungicidal product prior to the fitting of the membrane.

If any evidence of wet rot or dry rot is seen, have it dealt with by a qualified remedial specialist.

If a new slab is to be laid as part of the works, it is preferable to fit Newton 803 Newtonite prior to the laying of the floor slab with the floor DPM extending upwards in front of the Newton 803 Newtonite ready for the concrete pour.

Cutting to Size:

Newton 803 Newtonite can be cut with a sharp utility knife, scissors or shears

Decide whether the membrane is to be fitted horizontally or vertically

Membrane Jointing:

Joints may be made horizontally or vertically

Joints are created by butt jointing the two edges together and then oversealing the joints with Platinum Mesh Tape.

Newton 803 Newtonite can be taken round corners. On particularly difficult shaped corners, cut the Newton 803 Newtonite and butt joint and seal as above.

Platinum Mesh Tape should be firmly pressed into the mesh of the Newton 803 Newtonite to facilitate the joint.

In cold and damp conditions a heat gun should be used to gently evaporate surface moisture and then to assist in pressing the Mesh Tape into the mesh of the membrane

Sealing Around Protrusions:

Where the membrane has to be cut around pipes or other protrusions, carefully cut the membrane around the protrusion and then seal around the protrusion with Newton Sealing Mastic to ensure there is no bridging between the damp substrate and the new finish.

Fixing to the Wall:

Cut the membrane to size. Ideally, Newton 803 Newtonite should be continued up into ceiling voids and down past the slab to the oversite. If this is not possible, cut the membrane so that it finishes tightly to the soffit and floor finish. A gap is not required at the soffit or floor, indeed the system works more efficiently when the system is not ventilated as this impedes the natural vapour drive from inside the property to the outside that still continues through the Newton 803 Newtonite.

Newton 803 Newtonite is fitted to the wall with the studs facing the wall and the flat meshed surface facing inwards towards the applicator. Fix the membrane to the wall with Newton 800 Mesh Plugs to all substrates except when fixing to plywood or timber, when a galvanised clout nail should be used, or to slightly friable mortar substrate, when the Newton 800 Cob Plug should be used.

Newton 803 Newtonite can be fitted horizontally or vertically

Fit the membrane as level as possible - best results are achieved when a long builders level or a rotating laser level is used. Care must be taken to ensure that the Newton 803 Newtonite is pulled tight and square while fixing as this will avoid sagging or bulging which can cause problems when plastering or rendering

Using the 7mm drill bit, drill through the membrane into the wall to a depth of at least 50mm.

Apply a bead of Newton Sealing Mastic around the hole to the membrane so that when the plug is hammered home, the Mastic will seal between the plug and the membrane and so prevent migration of dampness and salting from the substrate to the wall finish.

Use a small number of fixings to initially fit the membrane to the wall as level as possible. Alternatively, The use of Sovereign SovStik Mesh Membrane Adhesive will help to hold the membrane in place prior to hammering home any fixings. This method can greatly improve the speed and ease of installation. Once the section of membrane is on the wall add the further fixings.

Hammer the plugs home using a wide headed hammer such as a lump hammer or mallet. A smaller-diameter bit can be used on softer substrate to ensure a tight fit for the plug.

Fixing centres internally must not be greater than 250mm.

On curved or uneven surfaces, closer fixings should be used. On exposed areas closer fixings are recommended, to restrain possible thermal movement.

Fit Newton 803 Newtonite 300mm to return walls to isolate wall finishes from dampness transmitting from the main wall being treated. Newton 803 Newtonite can be taken into reveals. Fixing should not take place above 30°C and below -5°C.

General:

Newton 803 Newtonite is suitable for wall finishes including plaster, render, hydraulic lime or plasterboard bonded to the