Finishing a ceiling after insulation: plasterboard or stretch ceiling?
After roof, attic-floor or interior wall insulation you need a new ceiling or wall. Plaster, plasterboard or a stretch ceiling: here are the differences in time, dust, access to the insulation and VAT — and how to keep the grant for the insulation safe.
Why the finish after insulation is different
Insulate a pitched roof from the inside, a flat roof from below or the inside of an exterior wall, and you end up with an open build-up: insulation, a vapour barrier and a timber or metal frame. That needs a finish that looks crisp, leaves the vapour barrier intact and keeps the services reachable.
The finish decides more than looks. It decides how long the job takes, how much dust and drying time you accept, whether you can still reach the insulation and pipes later, and how the lighting is built in. It also decides which part of the invoice is eligible for a grant: the insulation is, the finish never is.
Option 1: plasterboard, filler and paint
The classic route: plasterboard on the frame, joints and screw heads filled, sanded, primed and painted twice. Solid and available everywhere, but count on four to seven working days with drying times, fine dust throughout the house and a fixed construction: anyone who later needs to reach the insulation or the vapour barrier has to break the ceiling open.
On sloping ceilings and dormers the joints and junctions are the weak point too: settlement and temperature swings show up as hairline cracks in the seams.
Option 2: a stretch ceiling as the finish
A stretch ceiling is tensioned into a slim perimeter profile a few centimetres below the new insulation layer. Installation usually takes one day, with no dust, no drying time and no need to empty the room. The membrane is seamless up to 5.15 m (polyester) or 6.4 m (PVC) and follows sloping planes and dormers.
- Access stays: a PVC membrane can be released from the profile and refitted, or you add an invisible inspection hatch. Handy for a leak check, extra cabling or a later change to the insulation.
- Lighting is part of the system: spots, LED lines or a 48 V track are built into the ceiling — and so follow the 6% VAT rate in a dwelling older than ten years.
- Acoustics: a micro-perforated membrane with an absorber above turns a freshly insulated attic room into a quiet bedroom or office straight away.
- Humid rooms: PVC is unaffected by the humidity of a bathroom under the roof.
Inspection hatchAcoustic stretch systemStretch ceilings under a sloping roof
Vapour barrier and cavity: the technical agreements
A stretch ceiling is a finish, not a vapour barrier. The vapour barrier stays on the warm side of the insulation, continuous and taped, exactly as the insulation contractor specifies — in Flanders it is even a grant condition when a pitched roof is insulated from the inside. Never leave it out because a membrane is going underneath anyway.
Between insulation and membrane there is a cavity of a few centimetres. That is where pipes, cables and the recessed boxes for the spots go. Heavy items such as a ceiling fan or a large fitting hang from the structure above, not from the membrane. Agree the profile height and the spot positions before the insulation contractor finishes, so nobody has to come back.
For interior wall insulation the same applies to a stretch wall: insulation and vapour barrier first, the wall system over it, with frames for sockets and switches.
How to keep the grant for the insulation
In Flanders an owner-occupier in income category 3 or 4 gets a Mijn VerbouwPremie for roof or attic-floor insulation (Rd ≥ 4.5) and for insulation on the inside of an exterior wall (Rd ≥ 2, by a certified contractor or under an architect's supervision). In Wallonia the Primes Habitation for roof and wall insulation run until 30 September 2026. In Brussels there are no regional grants in 2026.
- Ask for two separate items on the quote and the invoice: insulation (with the contractor's certificate, at least €1,000 excl. VAT) and ceiling finish.
- The finish is never eligible — plaster and plasterboard included — so a mixed invoice only makes the file harder.
- Both items get 6% VAT if the dwelling has been in use for at least ten years and the contractor supplies and installs.
- File the grant after the final invoice for the insulation; in Flanders via Mijn VerbouwLoket, within two years.
What it costs and how to plan it
Count on roughly €70 to €200 per m² excl. VAT, installed, for a stretch ceiling depending on type and lighting; a plasterboard ceiling with filling and painting usually lands between €35 and €70 per m² but takes a week on site. The gap narrows as soon as you count the spots, the acoustics and the lost days.
A practical schedule: days one and two insulation and vapour barrier, day three the stretch ceiling, the lights on that same evening. A STRETCH installer in your region measures the room free of charge and matches the profiles to the insulation contractor's frame.
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