Roof insulation
in Uccle
On the building stock of Uccle — town houses, mansard roofs, natural slate, worked zinc work — roof insulation calls for an adapted method. Roof insulation of the loft, the loft floor and the roof slopes, with a continuous vapour barrier and ventilation kept clear.
The context in Uccle
Why here in particular
What changes in Uccle is the context: mansion houses, mansard roofs, natural slate, finely worked zinc work. Mansards and dormers multiply the joints: that is almost always where the water ends up getting in.
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 Uccle 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 Uccle
The questions we get asked most often before this kind of job.
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.
And without roofing underlay?
There needs to be a ventilated air gap under the roof covering, or you fit an underlay. Without it, the insulation takes on water the first winter.
Do you come out to Uccle with no extra call-out charge?
Yes. Uccle 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 Uccle
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
Roof insulation in Uccle: let’s talk about it
On-site visit, detailed costing within 48 working hours, with no obligation on your part.