Breast Indoor Walls - damp problems
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 unaffected area.
- 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.
- 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
- 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
- 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 'salting'.
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.
Membrane - 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 'bonding').
Proofing Cream - 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).
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01626 331351 FAX: 01626 331143
Returns Policy | About the Author
Repair Systems,Unit 3, Olympus Business Park, Kingsteignton Road, Newton Abbot,
Devon, TQ12 2SN
01626 331351 FAX: 01626 331143
written by: David Moore
Moore, B.A. (Hons.), C.T.I.S., C.R.D.S. Technical Author