Delta Membrane Systems
Membranes basement waterproofing systems dampness sealing floor
finishes
What are Delta Membrane Systems
With the introduction of the latest British
Standard 8102:(1990) "protection of structures against water from
the ground", the use of cavity membranes has been generally accepted
in the UK. 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 alkaline stabalised. The
stud heights vary between 3mm for DELTA-FM, 8 mm for DELTA MS 500 &
DELTA PT to 20 mm for DELTA MS 20. The cavity created by the
membrane contains between 5 and 10 Litres of space respectively.
This is known as either the "Air gap" or the "Drained Cavity", in
wet situations. The Sealed System for Basement
Waterproofing Systems
In Soil retaining situations such as basements
and vaults, the DELTA sealed system is recommended. The membrane
selection depends on the required finish and flow rate if
applicable. All the normal options are available for finishes to the
system, including plastering direct when using DELTA-PT. All
membrane junctions, fixing points, service entries and other
protrusions are sealed with the DELTA range of sealing products.
Where active ground water is evident or expected drainage of one
form or another should be incorporated into the specification. This
should be capable of controlling any free water that enters the
cavity, through preformed channels or sumps, to be drained away
naturally or by mechanical pumps. 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 100 mm 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.
Sealing Floor Finishes
As well as being a complete waterproofing and
damp proofing system DELTA SYSTEM 500 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.
DELTA - FM Delta - FM is specifically designed for floor
applications, to combat dampness, and contamination. The special low
stud profile (3mm) minimises changes in floor levels but still
provides an air gap to achieve damp pressure equalisation. The
membrane is a fast-track application that allows various floor
finishes to be achieved with zero 'down time'. The R.H. levels are
isolated in the air gap, and controlled. Delta - FM can be used in
new build, remedial or refurbishment projects for floors, and walls.
Preparation
As the membrane systems are mechanically fixed
there is no 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 - dampness sealing
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 other areas.
Flexibility
In structures where movement or vibration are 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%.
Speed
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 UK arm of the world's largest producer of studded membrane
systems. The market leading DELTA brand has a track record exceeding
three decades. The DELTA systems have been used successfully in many
situations in the UK From small domestic basements up to major
waterproofing projects such as, London Underground Stations. There
is rarely a dampness or water ingress problem that falls outside the
scope of the capabilities of the DELTA system.
External Protection
Delta Geo-Drain
Structures that are earth retaining can be
damaged by moisture penetration from the outside or by the 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 buildup of hydrostatic
pressure on the structure and filter the water via an internal
polypropylene filter layer. This prevents the fine ground particles
from blocking the drainage facility and avoids destabilising the
soil.
Who Installs Delta Systems
Although DELTA Systems are by comparison, easy to
install, it must be recognized that the 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.
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