9mm Fascia Board
9mm fascia board is the capping thickness, fixed over sound timber rather than replacing it, so a roofline can be refreshed without stripping back to the rafters. uPVC fascias come in 3m and 5m lengths in widths from 100mm to 600mm. For full replacement, see 16mm fascia board.
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Aquacel 9mm x 250mm x 3m Fascia BoardLength: 3m·0.75 m²
£27.60Inc. VAT
£36.80 per m² Inc. VAT
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Aquacel 9mm x 300mm x 3m Fascia BoardLength: 3m·0.9 m²
£34.50Inc. VAT
£38.33 per m² Inc. VAT
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Choosing 9mm Fascia Board
Frequently Asked Questions
9mm board is capping: it is fixed over sound existing timber to smarten the roofline without stripping back. 16mm is the full replacement thickness, strong enough to carry the guttering on its own once the old timber is off. If the timber behind is soft or rotten, capping over it only hides the problem.
Through into the rafter ends with polytop nails or stainless screws, two per rafter, at the top and bottom of the board so it cannot rotate under the weight of a full gutter. Fix into sound timber — if the rafter ends are soft they need cutting back and a new timber before the board goes on.
They do not have to, but a roofline reads as one line from the ground, so mismatched whites or a grey gutter on a white fascia tend to show. If you are replacing in stages, settle the colour across fascia, soffit, guttering and downpipe at the start rather than matching to what is already up.
A pitched roof needs continuous airflow at the eaves, so unless ventilation comes from somewhere else — over-fascia vents or a ventilated ridge — the soffit should be vented. Hollow soffit has the gap built into each joint. Flat soffit is unvented, so pair it with a vent strip or circular vents.