Flat-roof waterproofing
in Genval
Organised around its lake, Genval brings together older villas, holiday homes turned main residences and recent builds. Multi-layer bituminous waterproofing on a flat roof: garage, outbuilding, extension, non-accessible terrace.
The context in Genval
Why here in particular
Laid out around its lake, Genval brings together older villas, holiday homes turned into main residences and recent builds. In practice, the damp off the water and the timber roof overhangs mean the exposed roof timbers need particular attention.
A flat roof almost never leaks in the middle. It leaks at the upstands, at the corners and around the roof outlet — where the old membrane was badly turned up or has ended up shrinking back.
- Quote
- Priced after a site visit, free of charge and with no obligation.
- Duration
- 1 to 3 days for a standard surface.
- 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 of what is there
- Removal and disposal if needed
- Vapour barrier and insulation to suit the configuration
- Two-layer torched waterproofing
- Upstands, flashings and edge trims
- Roof outlet and overflow checked
Probing
We check what is under the membrane. Waterlogged insulation gets replaced, not covered over.
Removal or overlay
Depending on the condition, full removal or fitting over the existing layer if the substrate allows.
Vapour barrier and insulation
If the roof is insulated, PIR or wool depending on the configuration.
Undercoat
First layer, self-adhesive or torched, with staggered joints.
Finish
Top membrane torched on, mineral-finished or smooth depending on exposure.
Measurements and waste removal
Upstands round the perimeter, outlet spigot, water test verified.
Frequently asked questions
Flat-roof waterproofing in Genval
The questions we get asked most often before this kind of job.
Is the blowtorch a risk to the house?
On upstands and close to timber we work with self-adhesive or hot air. The torch is only used where it is safe.
What if water stands on the roof?
A residual puddle is acceptable. Permanent standing water points to a wrong fall or a badly placed roof outlet: that gets corrected when the roof is redone.
Do you attend leaks as an emergency?
Yes, a temporary repair first to stop the water, then costing the permanent repair calmly.
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.
Flat-roof waterproofing in the neighbouring municipalities
All our work in Genval · Everything about flat-roof waterproofing
A quote for flat-roof waterproofing in Genval?
On-site visit, detailed costing within 48 working hours, with no obligation on your part.