Indoor Walls - symptoms of damp
A quick summary checklist:
a 'damp meter' and surface thermometer (see www.dampness-info.co.uk/meters.htm)are
useful tools for this diagnosis - if not available use the back of your
hand to assess the relative dampness of one affected area to another
Symptom - white, fluffy
salts, plaster possibly 'blowing' off the wall - 'efflorescence' -
you have a water source which needs to be found and eliminated. Use our
Water Leak Checklist (click here).
Salt Neutraliser might work if you can find and stop the leak, or the
plaster may be too damaged and need replacement to our Specification.
Symptom - damp patches on
the ground floor (at low level, right down to the skirting board)
that come and go - you have 'hygroscopic' salts that are attracting moisture
from the air.
you may have Rising Dampness, or your damp proof course may be 'bridged'
by high outside ground, plaster on the inside or debris in the cavity
(cavity walls only). Rectify any defects and if necessary inject Quick
Cream at the correct level to form a new Damp Proof Course. The plaster
will need replacement to our Specification.
Symptom - damp patches on
or around chimney breasts - sometimes showing yellow or brown stains
in wallpaper or paint - you have 'hygroscopic' chimney salts that are
attracting moisture from the air, which may include tars and other chemicals
from burning wood or coal.
these 'salts' are very difficult to hold back in the wall, even with
the replastering to our Specification carried out to perfection. We
recommend using Mesh Membrane - a type of dry lining - to allow you
to replaster using normal, lightweight plaster, with no risk of further
Products for dealing
with chimney related damp, mentioned above:
Salt Neutraliser -
a clear liquid used to neutralise 'salts' in render, plaster or masonry,
either to attempt to save otherwise sound plaster or as a preparation
prior to re-plastering to our Specification. Apply two coats, wetting
in between with fresh water.
- easy to install
dimpled plastic 'air gap' dry lining membrane, supplied in rolls like
wallpaper. Designed to cover damp or salty walls and provide a fresh
surface for replastering with a modern lightweight plaster (usually
- new, easy to
install, cream damp proofing product - no pump required, no mess, no
smell - includes injection nozzle extension. Designed to gently diffuse
into the wall to form a water repellent layer - a 'damp proof course'
(DPC). It is approved by the British Board of Agrèment - BBA
Test Certificate No: 02/3961 - as used by the professionals. The BBA
is a Government Approved organisation which has been testing building
materials for over 30 years. Note - not all damp proofing materials
have passed these tests - beware of cheap imitations).
Learn from the UK's greatest
Expert: become your own expert - save money.
DIY Master Class in Dampness and Condensation - become your own
Expert in 1 hour! Buy our "Dampness in Buildings" reprinted
book by the great expert Graham Coleman. A great read, short and to
here to buy the reprint.
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Site written by: David
David Moore, B.A. (Hons.),
C.T.I.S., C.R.D.S. Technical Author
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