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Structural dampness refers to the presence of unwanted moisture in the structure of a building, either the result of intrusion from outside or condensation from within the structure. A high proportion of damp problems in buildings are caused by the "big three," condensation, rain penetration, and rising damp although other causes of dampness such as pipe leakage and construction moisture should not be overlooked.

Dampness tends to cause secondary damage to a building. The unwanted moisture enables the growth of various fungi in wood, causing rot. Plaster and paint deteriorate and wallpaper loosens. Stains, from the water, salts and from mold, mar surfaces. Externally, mortar may crumble and salt stains may appear on the walls; steel & iron fasteners rust. It may also cause respiratory illness in occupants. In extreme cases, mortar or plaster may fall away from the affected wall. There are many approaches to the treatment of dampness in existing buildings. Key to the selection of an appropriate treatment is a correct diagnosis of the types of dampness affecting a building.

Permanent Solution

  • Resistant and persistent water and chloride (salt) ingress problems, (including damp rising / UV instability / discoloration issues)
  • Fungus (Anti-Bacterial as optional solution in QFPP package)

Scope: Substrates to be treated include concrete / masonry / natural stone / mortars / wood.

Advantages of QFPP system:
  • Highly hydrophobic (impermeable to liquid water)
  • Permeable to water vapour (excellent breathability)
  • Chemical stability (against acidic or alkaline attacks)
  • Heat and UV stability (no more blistering and rupturing of coatings)
  • Environmental-friendly (Eco-Green technology for LEEDS rated buildings)
  • Clear and natural appearance (non – glossy)

Application – Insulation
Different in temperature causing excessive humidity between compartment and undesirable conditions as follows:
  • Condensation, frost or ice on the inside surface of windows.
  • Damp spots on ceilings or inner surfaces of exterior walls.
  • Mold or mildew growth on walls and ceilings.
  • Peeling/blistering of exterior paint.
  • Sweating water pipes.

Caused of Humidity and Condensation in Crawl Space
The vapour pressure increases as the air's moisture content increases; it rise up and stored in crawl space. When air is cooled sufficiently at soffit slab of First Floor, it will reach 100 percent relative humidity.

Condensation will begin to appear at dew point temperature. This is why air coming in contact with a colder surface, such as a glass of ice water or cold window, will deposit water droplets on this surface.

Vapour Barriers Insulation
Many materials used as interior coverings for exposed walls, such as plastic dry wall, wood panelling and plywood, permit water vapour to slowly pass through them. When the relative humidity within the room compartment at the surface of an unprotected wall is greater than that within the wall, water vapour will migrate through the plaster or other finish into the stud space, where it will condense if it comes into contact with surfaces colder than its dew point temperature. Vapour barriers are used to resist this movement of water vapour or moisture in various areas of the compartment. (Note: Installing a vapour barrier on crawl space surfaces will only assist in the control of excess moisture vapour and should be used in combination with an effective ventilation system.)