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Dak Meester — roofer in Flemish Brabant and Brussels
Roof insulation

Services

Roof insulation

Insulation of pitched roofs and lofts, from the inside or as sarking.

0492 95 94 94Free quote

What this covers

A large share of a house’s heat loss goes out through the roof: it is the first thing to tackle, well ahead of the windows. But in our climate, insulation fitted without a continuous ventilation gap turns the loft into a condensation trap. We regularly open up roofs where the timber is wet under insulation that is recent, thick and perfectly fitted — but pushed up until it touches the tiles.

  • Insulation between and under the rafters, joints crossed
  • A continuous air gap of at least 2 cm, open at the eaves and at the ridge
  • Continuous vapour barrier on the warm side, junctions sealed
  • Sarking during a full renewal: no thermal bridge and no loss of headroom
  • Existing ventilation checked, vent tiles if necessary
  • Certificate and technical data sheets attached to the invoice, for the grant or the sale

A ventilated air gap, otherwise the insulation damages the roof structure

0492 95 94 94Free quote
Roof insulation — workmanship detail

On site

Seen up close

A roof is judged on its details: the junctions, the overlaps, the penetrations. This is the point of workmanship that, on this service, makes the difference between a roof that lasts ten years and one that lasts thirty.

Insulation between the rafters with vapour barrier, ventilation gap under the underlay visible

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How the job runs

  1. 01

    Visit

    Condition of the roof structure, ventilation, existing insulation.

  2. 02

    Preparation

    Old insulation removed if necessary, ducts protected.

  3. 03

    Fitting

    Insulation, continuous vapour barrier, air gap maintained.

  4. 04

    Inspection

    Thickness checked, ventilation tested, certificate handed over.

Common questions

Roof insulation

A question that is not on the list? Ask it over the phone, the answer is free too.

For a pitched roof, aim for 18 to 24 cm of mineral wool or PIR depending on the material, to meet the requirements in force. In an existing roof structure the space between rafters is limited: you then add a second layer under the rafters, crossing the joints.

Where we carry out this service

Roof insulation — 24 communes

Choose your municipality: each page describes what this service involves locally, given the building stock and the surroundings.

Also worth reading

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A quotation for this service

Describe your situation in a few lines. We come and look, and you receive a detailed quotation within 24 working hours.

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  1. We call you back within one working day.
  2. Free visit: we go up on the roof and photograph it.
  3. Itemised quotation within 24 hours, no obligation.

Your details are used only to reply to you. No newsletter, no selling on.

Prefer to call? That works too: 0492 95 94 94

Our services

Everything that protects your house

From routine cleaning to complete renewal: one point of contact, from the first survey to handover of the job.

Not sure about your roof?

The visit costs nothing and the quotation follows within 24 hours. One call is enough to know where you stand.

0492 95 94 94Free online quote
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