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Newton
Newlath 2000 - Damp Proofing
 John
Newton & Company have been long established as suppliers of specialist
damp proofing materials to the Building Industry. For over 60 years
they manufactured and supplied Newtonite lathing. Over five million
metres of this pitch impregnated fibre material was used to damp proof
throughout the United Kingdom.
Having pioneered the air
gap system, the original Newtonite ventilated membrane principle has
been greatly improved with the introduction of Newlath and now NEWLATH
2000, and its polypropylene fixing plugs. This metal-free combination
avoids the likelihood of corrosion or deterioration and provides a
plastering base that will last indefinitely.
Since its introduction
NEWLATH 2000 has been used successfully when damp proofing a
wide variety of buildings.
For below
ground projects see the Newton
System 500.
| Membrane |
Colour |
Features |
| Newton
Newlath 2000 |
Clear |
5mm Stud
with Mesh |
Damp & Discolouration 
Rising and penetrating
damp, and discolouration caused by oil, salts, acids etc continues
to be a problem in many buildings. Even slight damp penetration will
cause discolouration to surface plaster and decorations. This is not
acceptable in living or storage accommodation and a permanent solution
must be found.
Why NEWLATH 2000?
NEWLATH 2000 provides a
firm key and an effective barrier on any damp or deteriorating surface
where direct bonding is not possible in above ground situations.
Alternative brushed or
sprayed-on damp-proof coatings must depend on the structure for their
performance. Likewise, silicone injection can only be effective if
the sub-strate is not subject to settlement-cracks or made up of various
materials. If settlement cracks appear subsequently the whole system
may break down. Likewise sheet membranes bonded to the wall fail when
they are punctured. Over a period of time bitumen coatings may also
break down owing to soil acids or movement.
NEWLATH 2000 however presents
a physical barrier between the old surface and the new finish. It
can be punctured when wall fittings are needed provided a Newton Mastic
is applied before fixing.
The air gap behind the
NEWLATH 2000 allows the wall to 'breathe' and to remain constant.
Excessive damp cannot accumulate to cause further deterioration. Residual
dampness will be vented into the rooms atmosphere and be dissipated.
The Material...
NEWLATH 2000 is made from
inherently stable, high density polypropolene 0.5mm thick formed into
a pattern of raised studs linked by reinforcing ribs. Polythene mesh
is thermic welded in the manufacturing process to the surface on one
side. The studs 5mm high face the wall and create air channels. On
the face the mesh provides a rot proof key for plasters and renders.
... its Strength and Stability
NEWLATH 2000 is inert with
high pressure stability. It is highly resistant to water, alkalies,
saline solutions and anorganic acids and is not effected by minerals.
It is also resistant to bacteria, fungi and other small organisms.
NEWLATH 2000 is light,
clean and easy to handle. It can be cut with a sharp knife or shears.
Damaged or crumbling plaster should if possible be removed to expose
brickwork. It is recommended that the NEWLATH 2000 be fixed using
the specially designed polypropylene plugs available with the material.
NEWLATH 2000 with the mesh facing outwards can be fixed vertically
from ceiling to floor or horizontally.
NEWLATH 2000 must be pulled
tight during fixing as this will avoid bulging and fixed to as flat
a surface as possible. Holes can then be drilled through the NEWLATH
2000 into the walls to a depth of at least 50mm. Depending on the
substrate use a 7mm or 8mm drill bit. Holes should be filled with
Newlath mastic prior to the plug being tapped home flush with the
material. The plug is then tapped home flush with the material. If
excessive force is used to fix the plug a mattressing effect can occur.
Fixing centres should be between 250mm and 300mm, horizontally and
vertically depending on the plaster finish (see plaster paragraph
below). Externally or on curved, or uneven surfaces closer fixings
should be used. NEWLATH 2000 should be fitted on any return wall to
a length of 300mm to avoid drawing damp from the original offending
wall. The NEWLATH 2000 ventilation profile should be used both top
and bottom where possible and fixed in place before the NEWLATH 2000
is applied. (See ventilation paragraph.)
Where NEWLATH 2000 has
been cut around pipes, fittings etc (or where the material has been
accidentally punctured) the exposed area must be treated with a waterproof
mastic to ensure that there is no bridge between the old damp and
stained surface and new finish. NEWLATH 2000 should be taken into
reveals and mastic-sealed along window frame edges and architraves.
Jointing
An area 100mm wide along
the length of one side of the material is free of mesh to permit easy
lap jointing. Laps can also be made where the mesh is on both surfaces
but should not be less than 100mm. The fixing must be through both
surfaces as close to the joints as possible. Closer fixing centres
are recommended at lap joints.
Joints may be made both
horizontally and vertically and where necessary a 'butt joint' may
be made. A strip of dpc or heavy-duty polythene approximately 200mm
wide should be put behind the butt joint to ensure that bridging does
not occur when the plaster or render is applied.
The NEWLATH 2000 Ventilation Profile
 When
possible NEWLATH 2000 should be taken up into the ceiling void.
Newlath 2000 profile strip
should be used at the wall floor junction to prevent bridging. Where
a polythene membrane is incorporated in a new floor this should be
carried up at least 150mm behind the NEWLATH 2000.
Plastering and rendering options
Whitewall Onecoat from
Tilcon. A premixed, dry-bagged one-coat plaster. Tried and tested
on NEWLATH 2000, fixing centres must not exceed 300mm.
Carlite Bonding
Has good elasticity and
is recommended where there is a risk of background movement. Fixing
centres must not exceed 300mm.
Universal One Coat
Very hard, and dries quickly.
Scratch coat (5mm) sets in two hours. Second coat (10mm) sponged or
trowelled finish. Fixing Centres should be between 250mm and 300mm.
Thistle Hardwall
Needs to dry out completely
after each coat - Please note: it is imperative that clean water
be used for each mix and that all necessary equipment including mixers
is cleaned after each application. Failure to do so could result in
accelerated drying times, which could result in the plaster cracking.
Thistle Finish
Coat
A 3mm skim coat to finish.
Cement based renders
For internal cement renders
the mix to be six parts clean sharp sand, one part lime/ plasterciser
and one part cement. A two coat application is recommended allowing
1-10 days between coats. Drying time is important because shrinkage
cracks may appear.
Note:
All plasters, renders etc must be to a minimum total depth
of 15mm. The undercoat should be applied with firm pressure to an
approximate thickness of 5mm and be well scratched by means of a wire
scratcher. When a render coat has set, the floating coat should be
applied to a depth of 7mm and lightly scratched to provide a key for
the final coat which should be to a minimum thickness of 3mm
All plasters and renders
should be applied strictly in accordance with the manufacturers' instructions
and good plastering/ rendering practice as described in BS5492 and
BS5262 Code of Practice.
Do not apply decoration
until plaster is thoroughly dry.
Dry lining
NEWLATH 2000 can be effectively
used in conjunction with dry lining. Fix NEWLATH 2000 as normal and
apply dabs of Gyproc Drywall adhesive onto the fixing heads. 12.5mm
plaster board is the most suitable to use with NEWLATH 2000. This
size ensures minimum gaps between boards and aligns with NEWLATH 2000
fixing centres. Leave gaps top and bottom as before. Pack up board
at base to stop it slipping whilst drying (approx 90 minutes). Cover
50% of mesh with bonding compound.
External use
NEWLATH 2000 can be used
externally as a waterproof support for rendered finishes in exposed
situations such as gable ends etc or where external walls have deteriorated
through sea salts or wind corrosion. Fixing and fitting should be
in accordance with the above directions but fixings should be at 150mm
centres. Movement joints should be trowelled into the laps and brought
through the third coat. (Please see current brochure
for full external fixing instructions.)
Render should be applied
in three coats in accordance with BS5262.
It is important to note
that traditional renders are prone to cracking and you are advised
to seek the advice and assistance of the NEWLATH
2000 Technical Department and to see our separate external
use leaflet.
NOTE:
Newlath 2000 is for use in above ground damp proofing situations only.
For below ground situations - where hydrostatic pressure may exist
- use the Newton System 500 cavity drain
system.
Installation
Technical Data
NEWLATH 2000 at Work
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