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In Soil retaining situations such as basements and vaults
etc. The DELTA sealed system is recommended.
The membrane selection depends on the required finish and
flow rate if applicable. All membrane junctions, fixing
points, service entries and other protrusions are sealed
with the DELTA Seal range of sealing products.
Where active ground water is evident or expected drainage
of one form or another should be incorporated into the
specification. Our Technical staff are available to give
advice in this respect.
The Ventilated System
In above ground situations or in areas where no free
running water is expected, for example where external pavements
have been built up the ventilated system can be used. The
ventilated system with air gap at top and bottom does not
require sealed joints or fixings, a 100mm overlap is sufficient
in this situation. This
method is seen as a sympathetic solution in Heritage
type properties as a general damp proofing system. The
fabric of the building remains unchanged but the new internal
surfaces are 'dry' and are salt and contamination free.
Both dry lining or plaster direct finishes are available
on the ventilated system.
As well as being a complete waterproofing and damp proofing
system DELTA system is also used to upgrade
damp and defective floors. With excellent crush resistance
the system lends itself to a variety of different finishes
which include conventional screeds, thin layer fast drying
screeds and wood based floating floors. Insulation can
also be used in conjunction with the system where required.
The system can be linked to the D.P.C. constructed within
a new wall or to an existing or chemical D.P.C.
As the membrane systems are mechanically fixed there
reliance on the ability of the product to bond to the
substrate. The DELTA system can be applied
to a variety of different substrates for example over
existing renders or broken down bitumen coatings, etc.
This can be easily achieved without detriment to the integrity
of the system.
Damp Pressure Equalisation
The studded structure of the membrane allows the dampness
behind the membrane to move in all directions unhindered,
therefore the whole of the wall or floor surface takes
the damp loading. Break down created by weak points are
eliminated. The product does not divert the problem to
In structures where movement or vibration can be a problem,
examples being under street vaults, railway arches, and
buildings constructed with movement joints,
the DELTA system can cope. The DELTA membrane
has an elongation break of greater than 50%.
As there is little or no preparation required the system
is by comparison quick to install. When dry finishes are
used the system is a 'fast track' solution. Decoration
does not need to be delayed as there is no drying process. DELTA Membrane
Systems are the U.K. arm of the world's largest producer
of studded membrane systems. The market leading DELTA brand
has a track record approaching three decades. The DELTA systems
have been used successfully in many situations in the U.K.
From small domestic basements up to major
waterproofing of London Underground stations there is
rarely a dampness or water ingress problem that falls outside
the scope of the capabilities of the DELTA system.
What are DELTA Systems
With the introduction of the latest British Standard
8102 (1990) 'for Protection of structures against water
from the ground', the use of cavity membranes has been
generally accepted in the U.K. DELTA Systems
are a complete range of products which are used together
to solve many of today's problems in both new and old construction. DELTA Systems
can easily deal with aggressive ground water conditions,
where basements are liable to flooding, or indeed where
simple dampness, contamination or salting problems are
prevalent. Other more diverse applications include Turf
covered roofs, barn conversions, tunnel linings or even
as a barrier against radon gas.
The main components of the system are the membranes themselves.
These are manufactured from virgin high density polyethylene
which is thermally and alkaline stabilised. The stud heights
vary from 3mm for DELTA-FM, 8mm for DELTA MS 500 & DELTA
PT to 20mm for DELTA MS 20. The
cavity created by the membrane contains between 2.1 and
10 Litres of space respectively. This is known as either
the 'Air gap' or the 'Drained Cavity', in wet situations.
DELTA-MS 500 This is used for walls
and floors, and is supplied in 2.4, & 2m x 20m rolls.
This membrane can be used for light water ingress situations,
and is available in brown, yellow (DELTA-FM), and clear. The
500 clear aids the selection of good fixing
points in the more difficult application i.e. Random stone
and friable brickwork. The sealed DELTA fixing
is used to secure System 500, the centre shank of this
fixing is also used for subsequent dry lining applications.
DELTA PT LATH This membrane has a mesh
incorporated on the internal face which is attached by
a thermic welding process at the time of manufacture. The
sealed PT fixing plug is used to secure the
membrane at 250mm horizontal and vertical centres. The
welded mesh and fixing plugs allow for direct render 1.1.6.
(cement/lime/sand), or plasters: Tilcon Whitewall, Carlite
Bonding, or dab fixed plasterboard for internal applications.
When this grade is used for external above ground protection
DELTA renders can be used as a finish. These renders are
polymer modified and also have reinforcing fibres incorporated
for added strength and durability. This grade is available
in clear 2.0m x 20m (40m 2) or 1.5m x 10m (15m 2).
DELTA MS 20 This is a heavy gauge version
of System 500 with deep 20mm studs. This is used where
extra drainage capacity is required, for example on deeper
structures, or where a larger flow rate is required. MS
20 can also be used as a 'cavity former' for many types
of new construction. The rolls are a full 2 metre width
by 20 meters in length (40m 2).
Structures that are earth retaining can be damaged by
moisture penetration from the outside or by water under
hydrostatic pressure. DELTA Membranes
are available as geocomposites to deal with such problems.
They act as a waterproof
drainage layer, and quickly remove the water to suitable
drainage around the structure. They prevent the build-up
of hydrostatic pressure on the structure and filter the
water via an integral polypropylene filter layer. This
prevents the fine ground particles from blocking the drainage
facility and avoids destabilising the soil.
DELTA membrane systems come with a
thirty year guarantee. The guarantee covers the membrane
and all other system components. Based on experience, accelerated
ageing tests and a quality manufacturing system to ISO
9001, the DELTA range can also be guaranteed
Technical site and/or office visits
Staff are available to visit site to give advice on particularly
difficult or in unusual situations, where appropriate specifications
are prepared to assist in the correct use of the system.
We believe our technical staff to be second to none and
certainly the most experienced in the U.K. Market. This
service is open to
Property owners, Architects, Surveyors and specialist
Who Installs DELTA Systems
Although DELTA systems are by comparison,
easy to install, it must be recognised that correct diagnosis
of the problem is essential so that DELTA systems
can be designed and tailored to the needs of the building,
to give the best possible performance.
It is therefore recommended that only competent specialist
contractors, who understand dampness, and the associated
problems, be employed to survey the site, install the system
and thereby ensure the best possible performance of the
system. DELTA systems are installed by
a nationwide network of specialist contractors who are
holders of 'Registered Installers' Certificates.