Flat-roof waterproofing
in Overijse
Multi-layer bituminous waterproofing on a flat roof: garage, outbuilding, extension, non-accessible terrace. We do it in Overijse from our base in Walloon Brabant, always with an on-site pricing visit before anything is committed.
The context in Overijse
Why here in particular
What changes in Overijse is the context: post-war villas on sloping ground, old greenhouses, complex roofs with multiple pitches. The tree cover keeps the roofs damp and the gutters fill twice a year rather than once.
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 Overijse 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 Overijse
The questions we get asked most often before this kind of job.
Can you lay over the old flat-roof waterproofing?
If the surface is dry and sound, yes. If the insulation is waterlogged, no: the problem would come back from underneath.
Can you walk on it afterwards?
Occasionally, for maintenance. For a walk-on terrace you need protection: slabs on pedestals or ballast.
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.
Do you come out to Overijse with no extra call-out charge?
Yes. Overijse 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 Overijse
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 Overijse · Everything about flat-roof waterproofing
Flat-roof waterproofing in Overijse: let’s talk about it
On-site visit, detailed costing within 48 working hours, with no obligation on your part.