Flat-roof waterproofing
in Grez-Doiceau
Converted farm buildings combine long roof valleys, endless fascias and old roof timbers that have rarely been treated. That is why flat-roof waterproofing comes up so often in our schedule in Grez-Doiceau.
The context in Grez-Doiceau
Why here in particular
What changes in Grez-Doiceau is the context: brick and stone farms, converted barns, contemporary houses with flat or low-pitched roofs. The big converted farm buildings combine long roof valleys, endless runs of fascia and old roof timbers that have rarely been treated.
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 Grez-Doiceau 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 Grez-Doiceau
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 Grez-Doiceau with no extra call-out charge?
Yes. Grez-Doiceau 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 Grez-Doiceau
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 Grez-Doiceau · Everything about flat-roof waterproofing
Flat-roof waterproofing in Grez-Doiceau: let’s talk about it
On-site visit, detailed costing within 48 working hours, with no obligation on your part.