Fascia Boards: Wood Rot, Delamination and Maintenance

A house may have fascia boards. A fascia board is a finishing touch to a gutter, and may also be a roof edge finish (for a flat roof).

• The fascia boards may be affected by wood rot. Wood rot should always be professionally repaired, after which the paintwork (in some areas) should be reapplied.
  • Note: Wood rot can still be present in invisible places! Wood rot can also become visible when removing layers of paint.
  • Wood rot may have been professionally repaired in the past, or wood rot may have been deliberately hidden, either professionally or not.
  • Regular, expert, and proper maintenance is therefore essential! Pay particular attention to connections, corners, and seams to ensure they are sealed and moisture cannot penetrate.
• Parts of the fascia woodwork can delaminate. Delamination is the loss of cohesion between the layers of a multi-layered material. This can be caused by poor adhesion between the layers due to a manufacturing defect or a gradual loss of adhesion due to the effects of moisture or air on the adhesive, etc. Delamination of woodwork cannot be repaired; at some point, parts of the woodwork will have to be replaced.

• The original fascia boards may be covered (fully or partially) with a (solid core) material. The solid core material cannot be installed with ventilation, as it cannot ventilate between the different materials, and there is a high risk of condensation, resulting in damage to/wood rot of the underlying woodwork. If the solid core material is not installed with ventilation, we recommend removing the solid core material covering the overhang and reapplying it professionally (on rubber pads) with ventilation.
  • After removal of the Trespa (or solid wood), defects in the underlying woodwork may become visible.
  • The advantage of this covering is that painting is unnecessary.
• If such cladding was applied later to the original woodwork, a zinc bead and/or roof trim (from the roof or gutter) cannot be installed over this later-applied material. The detail can no longer function as intended due to the applied cladding. The bead is intended to make the whole thing attractive and sturdy, but (like roof trim) it also has a lesser function. Water that tries to drain towards the bead/roof trim is now obstructed and can get behind the cladding. With insufficient ventilation or cold installation of the cladding, this can cause wood rot, etc., to the underlying structure, or it may already be present.
  • If such a (roof) detail is covered or panelled, this detail should also be improved in the bead/roof trim.