Pitched roofs

Also see:

7.2.23Fascias and trim

Fascias, bargeboards and soffits shall be appropriately fixed and treated against decay.

Table 14: Materials acceptable for facia boards

Exterior grade plywoodBS EN 636 Class 3
High density fibre reinforced calcium silicate boardBS EN 12467
Glass fibre reinforced cement (GRC) boardBS EN 12467
Proprietary productsTechnical Requirement R3

When installing fascia boards and soffits:

  • timber for external feature work should be free from waney edges, large knots, resinous pockets, splits and other unsightly defects
  • timber for fascias, bargeboards and soffits should be pretreated with preservative
  • where preservative treated timber is cut or planed, preservative should be applied to the cut edge
  • where timber is to be painted, it should be knotted and primed on all surfaces before fixing
  • where timber requires a stained finish, one coat of stain should be applied before fixing
  • each joint should be cut and fixed neatly.

Fascia boards should be fixed:

  • twice to each rafter
  • with splayed butt joints.