Addressing Dampness and Moisture in Walls Prior to Redecoration

Redecoration – In order to prepare for your next redecoration project, the overall condition of substrates must be analyzed, a point in hand is the presence of unwanted moisture in the structure of a building, either the result of intrusion from outside or condensation from within the structure. The most damage to paint systems, and eventually to the substrate and the structure, is caused by excessive moisture in the walls.

damp can be of three categories,

  • Condensation due to temperature differences between moisture containing air and the building surfaces.
  • Rising damp emanates from water in the ground. Rising damp is the common term for the slow upward movement of water in the lower sections of walls and other ground-supported structures by capillary action. The height of the rise is rarely above 1.5m.
  • Penetrating damp is caused by rain and is also known as descending damp and lateral damp.

Prior to painting, the building needs to be inspected for all signs of dampness. Tell-tale signs of dampness are the deposition of salts on the surface, flaking paint, water staining and discolouration. Pigments used in premium quality exterior coatings are chemically stable and UV stable under “normal” conditions i.e. moisture levels below 12%. The pigments used have the highest rating resistance to acid and alkali but at high moisture levels, soluble salts from the plaster composition and elsewhere are transported through the coating by the moisture and deposited on the coating surface. The result is discolouration of the surface of the paint and sometimes deterioration of plaster. Prior to painting, it is essential that causes of dampness are established and cured. Dreamcoat painting prides itself on adhering to painting practices that address the damp proofing necessary to apply sound coating systems that protect your asset and investment in your redecoration. Contact Dreamcoatpainting for your next re-decoration requirements.