Vented Soffit Board
Vented soffit board carries a perforated strip that lets air into the roof space, meeting eaves ventilation requirements without a separate vent run. uPVC soffit board comes in widths from 150mm to 405mm at 5m, sitting under the guttering. For an unvented overhang, see flat soffit board.
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22 UK Branches
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Aquacel 150mm x 5m Vented Soffit BoardLength: 5m·0.75 m²
£46.00Inc. VAT
£61.33 per m² Inc. VAT
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Aquacel 200mm x 5m Vented Soffit BoardLength: 5m·1.0 m²
£51.76Inc. VAT
£51.76 per m² Inc. VAT
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Aquacel 300mm x 5m Vented Soffit BoardLength: 5m·1.5 m²
£69.00Inc. VAT
£46.00 per m² Inc. VAT
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Aquacel 250mm x 5m Vented Soffit BoardLength: 5m·1.25 m²
£57.50Inc. VAT
£46.01 per m² Inc. VAT
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Aquacel 405mm x 5m Vented Soffit BoardLength: 5m·2.025 m²
£103.50Inc. VAT
£51.11 per m² Inc. VAT
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Aquacel 225mm x 5m Vented Soffit BoardLength: 5m·1.125 m²
£56.34Inc. VAT
£50.08 per m² Inc. VAT
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Aquacel 175mm x 5m Vented Soffit BoardLength: 5m·0.875 m²
£41.00Inc. VAT
£46.86 per m² Inc. VAT
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Choosing Vented Soffit Board
Frequently Asked Questions
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.
Measure from the face of the rafter ends back to the wall, and add a little for the board to sit into the fascia and against the brickwork. That is the soffit width. Boards run from 100mm up to 600mm, so measure at both ends of the elevation — an older roof often has a projection that varies along its length.
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.
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.