Do I need vented soffit board?

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.

What width soffit board do I need?

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.

Do fascia, soffit and guttering need to match?

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.

What is the difference between 9mm and 16mm fascia board?

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.

Flat Soffit Board

Flat soffit board closes the underside of a roof overhang, running between the fascia and the wall to seal the eaves against birds and weather. Boards come in 9mm thickness, 3m and 5m lengths, and widths from 100mm to 405mm to suit the rafter projection. Where airflow is needed, use vented soffit board.

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Aquacel 9mm x 150mm x 5m Flat Soffit BoardLength: 5m·0.75 m²

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Flat Soffit Board

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Frequently Asked Questions

Do I need vented soffit board? + −

What width soffit board do I need? + −

Do fascia, soffit and guttering need to match? + −

What is the difference between 9mm and 16mm fascia board? + −

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