The ‘Original’ Delta-PT Fixing Instructions

1. Preparation

Loose, friable and “blown” material should be completely removed from the substrate.  Well bonded finishes, however wet or contaminated can be left in-situ.  Rough and/or uneven surfaces should be dubbed out with a 1:4 Portland cement and Sand render.  This render should be modified with a SBR. Bonding agent

Fitting and electric cables should be removed where possible. These can be re-sited on the dry side, once the membrane is fixed.

2. Membrane Application General

The membrane should be applied in individual 1.5 m. / 2m. wide sheets in vertical sections.
Where horizontal overlaps are required, it is important to ensure that the upper edge of the sheets which follow below should always be lapped on the inside, (room side) of the lower edge of the higher sheet.

Where the membrane is applied vertically, the lap joint is made be lapping over the non-meshed edge, with the meshed edge of the next sheet. This junction can be sealed with Delta-Tape or mastic.

3. Fixing the Delta-PT

The membrane is offered up to the substrate 8mm. Holes are drilled through the membrane stud area to a minimum depth of 50mm.     Delta-Rope should be pre applied under the head of the fixings to reseal the pre-drilled hole. The PT-Lath fixing plug is driven into the hole to support the membrane.

PT-Lath Fixings should be installed at maximum 250mm centres, both horizontally, and vertically. Slight movement of the membrane will be experienced but this is normal. Where excessive movement is present between fixing points, extra fixings may occasionally be required. This can be the case on uneven surfaces.

Corners and/or angles which are uneven or out of square, should be reinforced with Polythene type D.P.C. This is applied with the centre of the D.P.C. extending either side of the corner before the Delta-PT membrane is applied.

The two membrane sections butt joint into the corner and a mastic seal joins the two sections of the Delta-PT membrane together. This will stop the plaster bridging behind the membrane through the damp structure:

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