Hollow Soffit
Hollow soffit board runs under a roof overhang with a ventilation gap built into each joint, so the roof space breathes without cutting in separate vents. uPVC soffit board comes in 300mm widths at 3m and 5m in white, closing the eaves under a run of half round guttering. Part of the fascia and soffits range.
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In Stock
Aquacel uPVC 300mm x 5m Hollow Soffit BoardLength: 5m·1.5 m²
£13.80Inc. VAT
£9.20 per m² Inc. VAT
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In Stock
Aquacel uPVC 300mm x 3m White Hollow Soffit BoardLength: 3m·0.9 m²
£14.94Inc. VAT
£16.60 per m² Inc. VAT
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Choosing Hollow Soffit
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.