Roof insulation
in Lasne
Roof insulation of the loft, the loft floor and the roof slopes, with a continuous vapour barrier and ventilation kept intact. In Lasne (1380) it is a regular request: detached properties add up plenty of roof square metres and outbuildings nobody thinks about until the first leak.
The context in Lasne
Why here in particular
Very scattered housing between meadows, hedges and woodland: Lasne is among the greenest municipalities in Walloon Brabant, with large isolated properties. In practice, those isolated properties add up a lot of square metres of roof plus outbuildings that get forgotten until the first leak.
In Belgium, 25 to 30 % of the heat lost from an uninsulated house goes out through the roof. But roof insulation fitted without a continuous vapour barrier and without an air gap simply moves the problem: the vapour condenses in the wool and the roof timbers take in water.
- Quote
- Priced after a site visit, free of charge and with no obligation.
- Duration
- 1 to 4 days depending on the surface area and the layout.
- Call-out
- Included in Lasne and neighbouring municipalities
How it runs
How the job runs
The same protocol everywhere, adapted to what the visit reveals on site. Nothing is decided from the pavement.
- Survey and calculation of the thicknesses
- Mineral wool or cellulose insulation
- Continuous vapour barrier and tapes
- Treatment of penetrations and openings
- Keeping the air gap
- Removal of offcuts
Site assessment
Available thicknesses, roofing underlay present or not, existing ventilation.
Preliminary treatment
Sound roof timbers before insulating. We never cover over attacked timber.
Fitting the insulation
Mineral wool between and under the rafters, or blown onto the loft floor.
Vapour barrier
Continuous membrane, overlapping strips, tape on every penetration.
Ventilation
Air gap kept under roof covering. That is what prevents condensation.
Frequently asked questions
Roof insulation in Lasne
The questions we get asked most often before this kind of job.
Do you lose ceiling height?
On a pitched slope yes, a few centimetres. We measure it beforehand so you can decide knowing the facts.
What thickness should you aim for?
For a roof slope, 22 to 30 cm in total depending on the product’s lambda. Below that, the gain does not pay for itself.
Loft floor or roof pitch?
If the loft is not lived in, insulating the floor costs less and heats less volume. If it is converted, it is the roof pitch.
Do you come out to Lasne with no extra call-out charge?
Yes. Lasne is one of our 17 municipalities: the call-out is included in the quote, not added at the bottom of the invoice.
Other work in Lasne
While we are on site
Combining two jobs in one visit brings the invoice down. We suggest it when it makes sense, never to pad the quote.
Roof insulation in the neighbouring municipalities
A quote for roof insulation in Lasne?
On-site visit, detailed costing within 48 working hours, with no obligation on your part.