Mon – Fri: 7:00 am – 5:00 pm
Sat: 8:00 am – 12:00 pm
Mon – Fri: 7:00 am – 5:00 pm
Sat: 8:00 am – 12:00 pm
This vented soffit board is a 9mm solid flat uPVC board in 5 metre lengths, with ventilation slots built into the face. It lines the underside of the eaves and lets air into the roof void at low level — the intake half of a proper cold-roof ventilation path.
Price range: £1.00 through £50.00
A plain soffit seals the eaves. A vented soffit board finishes the eaves and provides continuous-style airflow so moisture can move out of the loft instead of condensing on the underside of the roof. That is why it is the usual choice when you are replacing fascia and soffit on a cold pitched roof with insulation on the loft floor and no other eaves vents.
Sizes available: 100, 150, 175, 200, 225, 250, 300, 405 and 605mm
Colours: White, Rosewood, Light Oak, Black Grained (select on the product options)
Also known as: ventilated soffit, vented soffit, eaves vent soffit, 9mm vented board, slotted soffit board.
Warm, moist air from the house rises into the loft. In a cold roof, the outer roof surface is colder. Without a path for air to enter at the eaves and leave higher up (ridge or tile vents), moisture can condense on felt, timber and insulation.
A vented soffit board is the low-level intake. Air enters through the slots, moves through the loft, and exits at high level. No fans. No power. Just a clear path that must not be blocked by loft insulation stuffed into the eaves.
UK guidance (BS 5250 and the Approved Documents on moisture / ventilation) typically calls for the equivalent of a continuous eaves gap along both eaves on cold pitched roofs — often around 10mm equivalent for many pitches, and 25mm equivalent on low pitches. A vented soffit board is designed to contribute that free area along the run. Confirm which vent pattern you need for your pitch and span if you are unsure — we can advise.
| Type | Airflow | Best for |
|---|---|---|
| Vented soffit board (this product) | Built-in slots | Cold roofs that need eaves ventilation |
| 9mm plain soffit board | None | Warm roofs, or cold roofs already vented at eaves another way |
| Hollow soffit board | None (unless you add disc vents) | Lightweight T&G look; not a substitute for a true vented board |
| Attribute | Detail |
|---|---|
| Product | Vented soffit board |
| Material | uPVC |
| Thickness | 9mm |
| Profile | Solid flat board with ventilation slots |
| Length | 5 metres |
| Widths | 100, 150, 175, 200, 225, 250, 300, 405, 605mm |
| Colours | White, Rosewood, Light Oak, Black Grained |
| Function | Eaves lining + low-level roof ventilation |
| Maintenance | Wipe clean — no painting |
| Rot | Will not rot like timber |
| Use with | Fascia (16mm replacement or 9mm capover), corners, pins, guttering; high-level ridge / tile vents as required |
Measure fascia-to-wall in several places and choose the next suitable width so the vented soffit board seats cleanly in the fascia groove or trim.
Slots are sized to allow airflow while limiting larger pests. Keep the path behind the board clear — do not push loft insulation hard into the eaves and block the airway. Use insulation trays / eaves baffles where needed so the free area stays open.
If you send the roof type and pitch, we will point you at the right vented soffit board width and any extra vents.
01621 842 000 · WhatsApp 07949 280 147 · sales@showcaseplastics.co.uk
Mon–Fri 7am–5pm · Sat 8am–12pm
Maldon, Heybridge, Chelmsford, Colchester, Witham, Braintree, Burnham-on-Crouch, South Woodham Ferrers, Billericay, Basildon, Rayleigh, Southend, Romford and CM, CO, SS, RM, IG postcodes.
We can supply and fit the full fascia and vented soffit board package.
Widths: 100 · 150 · 175 · 200 · 225 · 250 · 300 · 405 · 605mm
Colours: White · Rosewood · Light Oak · Black Grained
Match the vented soffit board to fascia and gutter colour on the same elevation.
Trade: 5m lengths, full width range, matching fascia off the same shelf.
DIY: we will help you choose vented vs plain before you buy a full run.
Add this vented soffit board to an online estimate with fascia and guttering. We aim to reply within 24 hours. Collect from Maldon or ask for delivery when the job starts.
What is a vented soffit board?
A vented soffit board is a uPVC eaves board with slots that allow air into the roof void while finishing the underside of the eaves.
Is this vented soffit board 9mm?
Yes — 9mm thick × 5m long, solid flat board with vents, in widths from 100mm to 605mm.
Do I need a vented soffit board or plain?
Cold loft, insulation on the floor, no other eaves vents → usually vented. Warm roof or eaves already ventilated another way → plain may be fine.
Will a vented soffit board stop condensation on its own?
It provides the intake. You still need a clear path into the loft and appropriate high-level ventilation where the roof design requires it. Do not block the eaves with insulation.
Can birds get in through the slots?
Slots are designed for airflow while restricting larger pests. Keep the roof void detailing tidy and use the correct trims.
Same colours as fascia?
Choose White, Rosewood, Light Oak or Black Grained to coordinate with your fascia system.
How many boards?
Measure eaves length × choose width, use 5m lengths, add waste for cuts and corners. We will check a take-off.
Do you fit as well as supply?
Yes — across our Essex and London-border area.
Collection or delivery?
Both. Showcase Plastics, Unit 6, Heybridge Industrial Estate, Maldon CM9 4XL.
