Building Boards

Surface Characteristics

surface-characterstics-check (1)

  • Building boards and sheets come in varying types, some supplied pre-primed or factory finished
  • Manufacturers’ recommendations should be adhered to
  • Specific building board types are looked into below and painting recommendations given

Asbestos cement boards and sheets

Fiber-Cement-Board[1]What is it?

  • Alkaline in nature and therefore any oil-based paints applied will result in Saponification if the sheets are damp


  • If the boards are likely to get damp by virtue of location ( wall cavities or roof spaces), it is advised that the boards are primed first
  • Apply Sparcolux Paints Plaster Primer as a primer, which will serve to neutralise the high alkalinity
  • Coat with a PVA emulsion paint


Fibre insulating boards

fibre-insulating-board[1]What is it?

  • Boards treated with flame retardant
  • Flame retardant may surface if boards come into contact with moisture


  • Avoid applying water thinned PVAs as the first coat, as there are risks of efflorescence
  • Apply Sparoclux Paints Plaster Primer as an effective alkali resistant primer
  • Be sure to prime backs, cut-edges and edges of fibre boards to reduce risk of buckling and bending


Fibre boards (hard)

masonite-board[1]What is it?

  • Hard surfaced boards of high density, e.g. Masonite


  • Despite their hard, smooth surface the surface should NOT be rubbed down in preparation
  • Solvent-based paints should NOT be applied directly to the board as the hardboard will interfere with the paint drying
  • Prime the Hardboard with Sparcolux Plaster Primer
  • Back priming is advised where condensation is likely


Plasterboard/ Paper based board

plasterboard[1]What is it?

  • Used extensively in dry-lining systems


  • Manufacturers’ recommendations should be adhered to



Wood based boards and Sheets

woodchip-board[1]What is it?

  • Wood chip and particle boards
  • May be paper-faced


  • Priming of backs and edges before fixing is advised, especially if risk of condensation is likely


Expanded Polystyrene tiles and Sheets

polystyrene-board[1]What is it?

  • Polystyrene expanded products


  • Manufacturers’ recommendations should be adhered to
  • Use PVA emulsion paints only.
  • Solvent paints may attack the material while oil-based paint a constitute a fire hazard and therefore must not be applied