Roof insulation
in Genval
Roof insulation of the loft, the loft floor and the roof slopes, with a continuous vapour barrier and ventilation kept intact. We do that in Genval from our base in Walloon Brabant, with a costing visit every time before anything is agreed.
The context in Genval
Why here in particular
The damp coming off the water and the wooden roof overhangs call for particular attention to exposed roof timbers. So we adapt the equipment and the method rather than running a standard protocol.
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 Genval 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 Genval
The questions we get asked most often before this kind of job.
Are there any grants?
Depending on the Region and the period, yes, often tied to a minimum thickness and a registered installer. We tell you where to check rather than promising you an amount.
Cellulose or wool?
Blown cellulose for an uneven loft floor, board wool for a slope between rafters. Thermal lag is what counts in summer.
Do you lose ceiling height?
On a pitched slope yes, a few centimetres. We measure it beforehand so you can decide knowing the facts.
Do you come out to Genval with no extra call-out charge?
Yes. Genval 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 Genval
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
Your job in Genval
On-site visit, detailed costing within 48 working hours, with no obligation on your part.