FAQ’s – Damp Proofing
What is rising damp?
Rising Damp is the slow, upward movement of water from the ground, through the connecting pours of bricks and mortar, by capillary action. In severe cases, it can continue to rise to a height of 1.5 metres. If damp has been diagnosed by a building surveyor, or you are experiencing problems, with the property you are living in or let to a tenant, it is very important it is dealt with quickly, before secondary problems, such damage to soft furnishings or wood rotting fungus occurs.
Damp properties are unhealthy for all of us but especially for young children or older people, who suffer from respiratory problems. It is also unsightly, can lead to timber decay and expensive heat loss. When Damp rises from the ground, it carries with it hygroscopic salts, which are deposited in the masonry and wall plaster. On humid days, these absorb moisture from the atmosphere, so the wall will always remain wet, until the contaminated wall plaster is removed and replaced with damp proof plastering.
What causes rising damp?
Rising damp can occur for several reasons. The most common causes of Rising Damp are:
- The existing damp-proof course being bridged by higher external ground levels.
- Bridging of the existing damp proof course, by a higher, adjoining concrete floor.
- A breakdown of the existing damp proof course, due to age or natural movement of the property.
- The property is built prior to 1875 before damp proof courses became mandatory.
Tapco HomeDry damp surveyors are fully qualified to the high standards of the Property Care Association (PCA) and have many years of remedial treatment experience, with both domestic and commercial properties. This ensures they will assess and correctly diagnose the extent and cause any damp, prior to submitting specific recommendations for long-term, guaranteed protection of your property.
What is Lateral Damp Penetration?
Lateral Damp Penetration is when damp penetrates though a wall, from a higher external ground or floor level. It can cause walls to be very wet and often dos far more internal damage than Rising Damp.
This is often found in older London or suburban properties, which were built with Basements, Semi-Basements or Cellars that were not adequately protected against damp. Water from below the ground is forced through the wall by hydrostatic pressure, progressively causing considerable damage, until the room is no longer habitable.
How do we stop lateral damp penetration?
Conventional damp proofing will not cure this problem and in most cases far more radical measures are required. Tapco HomeDry are specialist at Structural Water Proofing, commonly known as Tanking. Our fully experienced technicians, prepare the walls, create a floor/wall joint and apply a gauged scratch coat of water proof rendering. Slurry coats of cementitious structural water proofing are applied, allowing each one to cure, before applying the next. Further damp proof rendering and plastering is then carried out, all of which blocks the penetrating damp.
Preparation of walls prior to applying structural waterproofing (Tanking)
Applying a structural waterproofing system, in accordance with B/A 91/2608, prior to plastering
Alternatively, in some situations, our surveyor may recommend the installation of a Cavity Drain or Ventilated Membrane. This is a high-density Polyethylene, studded membrane, which is fixed to the walls, using water proof ancillary plugs and tape, which can by plastered directly onto or dry-lined.
What are the other causes of damp?
Damp in a property can be caused by several other factors, all of which, Tapco HomeDry deal with.
- Condensation: by far the most common cause of damp, which in the majority of cases is caused by the lifestyle of the occupants.
- Rain penetration: caused by building defects.
- leaking plumbing: appliances or bathroom fittings.
- Flash flooding: during heavy rain fall or a burst water main.