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Newtonite Damp Proofing Membrane Installation
Each
roll of Newtonite contains the standard leaflet with the fixing
instructions. The procedure to follow is quite easy and
straightforward and full instructions are given below. Remember, however,
that the principle of Newtonite is to isolate the new surface from
the damp or stained substrate. It is not recommended, therefore, that any
plaster finish should be ‘run off’ from the area where Newtonite has
been used to an area where it has not. It is also recommended that the
Newtonite be carried from floor to ceiling. This aids insulation because
of the air gap between the product and the wall and also stops damp rising
above the Newtonite level. As a room is heated for domestic use, old
bricks can become porous and the dampness which in normal circumstances
would only rise to approximately 1.5m may well be drawn higher up and show
itself above the line of the Newtonite. If the plaster or render has
been ‘run off’ the Newtonite onto the old surface which subsequently
becomes damp, as the temperature cools down at night, the dampness may
percolate down through the new surface on the front of the Newtonite
and thus give the impression that the Newtonite has failed. It cannot
be emphasised too strongly therefore that you always remember to isolate the
Newtonite from any surfaces around it. As the instructions clearly
state, a small gap at the bottom should be left, and this can be easily
effected by using the Newtonite stop bead or alternatively a small
strip of wood which can be removed after the application of the material and
its face coating.
One
of the great advantages of the Newtonite system is that is can be
punctured. Water or any other substance are not kept back under
pressure and therefore, should you need to fix shelves or electrical
appliances, you can just drill directly through the surface material and the
Newtonite and into the wall before fixings are inserted. Make sure
however that the hole drilled has Newton Mastic applied to it
liberally before inserting the fixing. This will stop any ‘bridge’ happening
between the damp or stained surface and the new surface.
If you have any problems
in fixing the product please call us on 0800 068 0122
Newtonite
Fixing Instructions
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FIXING
Clean the substrate to obtain as flat a surface as possible. Remove any
damaged, loose or crumbling plaster. Newtonite (with the mesh
facing outward) should be fixed to a firm flat surface wherever possible.
Dubbing out may be necessary on uneven substrates. Newtonite is
fixed with the Newton Plug to all substrates except when fixing to
plywood or timber when a galvanised clout nail should be used.
Newtonite can be fitted horizontally or vertically.
Care must be taken to ensure
that the Newtonite is pulled tight and square while fixing as this
will avoid sagging or bulging which can cause problems when plastering or
rendering. Fix from the centre outward. Holes can be drilled through the
Newtonite into the wall to a depth of at least 50mm using a 7mm or
8mm bit depending on substrate. Before inserting the plug, a squirt of
Newton Mastic should be inserted in the hole to avoid any bridging of
moisture through the shaft of the plug when it is fitted. If excessive
pressure is applied when fixing the plugs this can distort the membrane
causing indentations in the Newtonite. A smaller-diameter bit can
be used on soft backgrounds to avoid the risk of pull-out. Fixing centres
internally must not be greater than 250mm horizontally or vertically. On
curved or uneven surfaces, closer fixings should be used.
Ensure firm and even fixing. Fit
Newtonite on any return wall to a length of 300mm to avoid drawing
damp from the original offending wall. Fixing should not take place in
extreme conditions, above 30° and below -5°.
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FITTING
Newtonite
can be cut with a sharp knife or scissors. Where it has to be cut around
the pipes or other fixtures, the exposed area must be treated with a
waterproof Newton Mastic to ensure there is no bridging between the
damp or stained surface and the new finish. Newtonite should be
taken into reveals. Newton Mastic sealing is recommended between
new plaster and window frame edges, etc. This avoids bridging. Plaster
board panels can be fixed to Newtonite by the dot and dab method,
giving a dry surface ready for immediate decoration. Bonding plaster can
be used. ‘Dabs’ should be applied on the Newtonite fixing heads and
membrane to cover 50% of the Newtonite.
Note: Although the Newtonite system poses no health hazards usual
protective clothing and goggles should be worn in accordance with current
health and safety regulations.
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JOINTING
The Newtonite can easily be bent
round corners as it is a very flexible material. Alternatively, it can be
butt jointed. Likewise, butt jointing would be appropriate if the material
is being used horizontally and the finish height is more than 3m. When
fixing the material, ensure that the plugs are not fixed initially close
to the area to be butt jointed as a strip of DPM or other waterproof
material 80mm wide must be inserted before the butt joint is completed. A
cheap and effective material for this is the wrapper on the Newtonite
roll, which can be cut into 80mm strips.
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NEWTON PROFILE
It is recommended that the Newtonite
is raised from the floor by 20-25mm to prevent bridging from the floor to
the wall plaster or render. Newton Profile, available in 2m
lengths, can be fitted to the bottom of the Newtonite as a plaster
stop, guaranteeing that the plaster/render will stop short of the floor.
Newton Profile must be fixed at the same time as Newtonite
and therefore before the plaster or render is applied. Newton Profile
is not recommended where the run of wall is uneven. Where a polythene
membrane is incorporated in the floor, it should be carried in front of
the Newtonite and tape jointed to form a seal where rising or
penetrating damp is problematic.
Where it is not appropriate to use the
Newton Profile, a small wooden bead can be placed on the floor when
the Newtonite is fitted, and taken away subsequently. This will
allow the air ventilation gap required.
A gap can be left at ceiling height of 3mm
and this can subsequently be covered by a wooden bead or coving. It would
be appropriate to leave a gap at ceiling level where moisture is the
predominant problem Newtonite is required to overcome.
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FINISHES
The most popular application to Newtonite
is plasterboard, although plywood boards and other moisture resistant
boards can be used. A dot and dab method would be applicable to apply
these materials using Gyproc Wall Adhesive or similar. The adhesive
should be applied to the fixing heads on the Newtonite and dabs on
the actual board to be fixed. At least 50% of the board should be covered
by dabs to ensure a good bond. The board should rest on a level plinth
when presented to the Newtonite and the bonding compound will of
course key into the mesh. It may be appropriate to drive in one or two
hardened fixing pins at the top and middle of the board to hold it in
place while the adhesive dries. Subsequently the pins can be driven home
or extracted when the fixing compound is thoroughly dry. The joints
between the boards can be taped and a skim coat of plaster if desired or
wallpaper or other decorative materials can be applied.
If plaster is to be applied then Tilcon
Whitewall One Coat or British Gypsum Thistle Hardwall can be used. Carlite
Bonding can also be applied but it does take longer to dry. All plaster
finishes should be applied strictly in accordance with the manufacturer’s
instructions and good plastering practice as described in
BS 5492: 1990 Code of Practice for internal plastering.
Always allow 24 hours drying time between
coats for plaster and 7 days for sand & cement.
DO NOT APPLY DECORATIONS UNTIL PLASTER IS
THOROUGHLY DRY.
If the finished wall is punctured when holes
are drilled to fix brackets, etc., a waterproof Newton Mastic
should be inserted before fixing bolts are inserted to ensure no
bridging to the damp surface occurs.
CAUTION: DO NOT USE LIMELIGHT, OR RENOVATING TYPE PLASTERS AS THESE CAN
EXPAND ON THE NEWTONITE AND BUCKLE THE FINISH.
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SAND & CEMENT RENDER
Render should be a mix of 1
lime: 1 cement: 6 clean well-graded sharp sand. To lessen the incidents of
cracking which is liable to occur with any cement-based render to a smooth
non-porous surfaced material such as Newtonite, it is best to mix
the lime and sand a day or more before use. Cement can then be added at
the time of rendering. The work should be of three coats. The purpose of
the scratch coat is to stiffen up the lath and to provide rough and
absorbent backing for subsequent coats.
Work this scratch coat well
into the mesh. Subsequent coats should be of the same mix. Each coat of
render should be allowed to dry for a period of not less than seven and
preferably ten days, longer if possible. Cracking may occur if shorter
time is allowed between coats.
If Newtonite is to be
used externally, technical advice should be sought from John Newton &
Company's highly qualified team of advisers.
NOTE: When using
masonry cement, do not use lime, as these materials contain a plasticizer.
All rendering should be applied in accordance with BS 5262.
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TECHNICAL HELP
Always remember our technical team at Newtons are ready to advise you on
Newtonite application and can be contacted on 0800 068
0122
Additional Information
Should the area to be covered by Newtonite be below ground and
subject to water ingress, you are strongly advised to contact John Newton &
Company by telephone or visit our website
www.newton-membranes.co.uk
to explore the possibilities of using our full tanking and partial
tanking materials which are designed specifically for this purpose. Our
technical team are always available to give advice either on the telephone
or if necessary by a visit to the site.
Guarantee
Newtonite and its ancillary products are guaranteed against deterioration
for a period of 30 years on condition that it has been fixed and finished in
accordance with the manufacturer’s instructions.
Call
now on 0800 068 0122 to order or for further technical information
Download Newtonite Installation Instructions
Download Newtonite Brochure
For Full Waterproofing Membrane Systems Please Visit Our Main
Website
John Newton & Company
12 Verney Road
London SE16 3DH
Freephone: 0800 068 0122
Email
Link
www.newton-membranes.co.uk
Providers of
Waterproofing and Damp Proofing Solutions For 160 Years
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