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DESIGN DATA

GENERAL – VENTILATED SYSTEM
Delta-PT is satisfactory for use as a support for a dry lining fixed by
plaster dabs, or for replastering/rendering, over internal walls of all
types of construction, in the following situations:
(a) Existing damp walls not under hydrostatic pressure
(b) In conjunction with a remedial dpc system where the walls have
a high salt content and/or it is necessary to complete the installation
immediately without allowing a period for initial drying in accordance
with BS.6576 : 2005
(c) Over a wall which has a friable or painted surface, is
contaminated with oil or mould, or has a high salt content
(d) Delta-PT is also satisfactory for use as a waterproof support for
render on walls in exposed external situations, and/or where the
brickwork has deteriorated
(e) When DELTA-PT is used as a substitute for DELTA-MS 500 and/or
installed as a ‘Sealed System’ in accordance with BBA certificate No.
00/3742, it may be deemed to be suitable for walls, vaulted ceilings
or archways or cellars in the following additional situations:
• Damp walls in underground situations subject to high ground
water levels, and perennial moisture
• On vaulted ceilings of archways or cellars subject to dripping water
• As a waterproofing or ‘tanking’ in areas subject to vibration
• The system is satisfactory for use as Type C (drained protection) in
accordance with BS.8102 : 1990.

FINISHING WORKS
When the membrane is installed, the walls can be replastered as
recommended in the current Delta technical literature.
Where Delta-PT is installed internally and plastered, permanent
decoration, such as vinyl papers or oil paint, may be applied.
Temporary permeable decoration (necessary when a remedial dpc
installation is replastered conventionally) is not necessary when
Delta-PT is used.
RESISTANCE TOWATER ANDWATER VAPOUR
The membrane is water resistant and has a high resistance to the
transmission of water vapour. Consequently, when used internally
where the surface is damp, there must be a flow of air across it..
RESISTANCE TO SALT TRANSFER
The system provides an effective barrier to the transmission of salts or
other contaminants from the substrate.

IMPACT RESISTANCE
Delta-PT, plastered, rendered or dry-lined, has a satisfactory resistance
to soft and hard body impacts.

WALL-MOUNTED FITTINGS
Wall-mounted fittings (apart from lightweight items such as framed
pictures) should be fixed (using recommended proprietary fixings)
through the membrane and lining board, plaster or render, to the
loadbearing structure behind. Holes made in the membrane should
be filled with a flexible sealant before inserting the fixing.
DURABILITY
Under normal conditions of use, the product will provide an effective
barrier to the transmission of salts, liquid water and water vapour for
the life of the structure in which it is installed.