| DELTA®-PT has been specially designed with damp control in mind. Dampness, which is found in many older properties, can be easily controlled using DELTA®- PT or DELTA LATH. |
The Material
DELTA®-PT is a special high performance polyethylene membrane which is extruded into a series of studs. The purpose of the studs is to create a continuous air gap behind the waterproof membrane. On the face of the membrane a welded mesh allows plasters and renders to bond efficiently to achieve dry and durable finishes. DELTA®-PT is watertight, resistant to high and low temperature extremes, chemically resistant to acids, alkalis, oil and solvents and is approved for use in drinking water applications.
Constant Ventilation for Permanent Dry Finishes
The 8 mm stud design of DELTA®-PT provides a continuous air gap which serves two purposes. Firstly to isolate the damp wall from the new plaster and decorative finishes and secondly to allow ventilation of the wall for permanent dampness control.
Ventilation can be achieved by using the DELTA®-PT profile or the 'air gap' can be vented externally via passive air vents.
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Ventilation gaps located at both top and bottom of the system allow circulation for this purpose.
The DELTA PT PROFILE
The DELTA®-PT PROFILE can be used at both the upper and lower edges of the membrane. The profile has ventilation slots incorporated to ensure that optimum ventilation is achieved. The profile section also acts as a guide for plaster or render coats.
DELTA®-PT can also be used as a drained cavity in conjunction with the sealed system 500. See separate brochure.
Installation of DELTA®-PT
DELTA®-PT sheets are installed vertically. Overlapped joints are facilitated with a non-meshed section, which is available along one edge of each sheet. The sheet is secured to the substrate with DELTA®-PT FIXING PLUGS at 250 mm vertical and horizontal centres.
The transparent sheet allows easy location of fixings so that the brick or stone can be identified from the mortar joints. Ventilation gaps can be used at floor and ceiling level to ensure the optimum air circulation.
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DELTA®-PT
provides a full range of options for internal finishes which include Carlite Bonding, Tilcon Whitewall, 1.1.6 cement lime sand render or dab fixed plaster board or Roundtower Natural Hydraulic Lime Plaster. (Contact our Technical Dept. for separate advice)
Plasters and renders should be trowel applied in two coats. The first coat is pushed into the dimples, and giving cover over the mesh of 6mm. This is lightly scratched and allowed to dry before the second coat of 9mm is applied. Skim finish plaster can be used in the normal way.
When dab fixing plasterboard the adhesive dabs are applied directly over the fixing heads. The adhesive dabs should cover 50% of the area. The boards are then wedged at the bottom and offered up to the dabs.
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