Inspecter d’abord, choisir ensuite
The key question is not which product should be applied, but whether the existing roof build-up is suitable to retain. A professional inspection should consider adhesion, moisture, blisters, cracks, detailing, falls and the condition of the existing waterproofing.
If the existing construction is sufficiently stable, a renovation system may be a strong option. If the roof build-up is structurally poor, heavily saturated or technically unreliable, full replacement may still be necessary.
Pourquoi la rénovation peut être intéressante
- Less material to remove and dispose of.
- Less disruption on sites that need to remain operational.
- Faster treatment of complex details with a liquid-applied system.
- Possibility to combine waterproofing with a reflective finish.
- Extension of the useful life of a technically sound existing roof build-up.
Les toitures bitumineuses comme base de rénovation
Many professional flat roofs use bituminous membranes. ONE®, 2.0 and various Wingum Plus H₂O systems can, according to Winkler, be applied to existing bituminous membranes under the correct conditions.
The phrase ‘under the correct conditions’ is important: age, surface condition, contamination, oxidation, adhesion and moisture issues must be assessed. The manufacturer defines the required preparation, primers, reinforcement and waiting times for each system.
Les détails complexes sont souvent le vrai défi
Risk on flat roofs is often concentrated around upstands, drains, rooflights, installations, joints and interfaces between different materials. Liquid systems can be especially practical here because they conform to the geometry.
That does not eliminate the need for reinforcement and detail products. Winkler uses accessories such as ONE® MAT, sealing bands and pads in several system build-ups.
Rénover ne signifie pas automatiquement moins cher
A renovation system can save material and labour, but it must first be technically correct. Additional preparation, moisture problems, local repairs or complex detailing can influence total cost.
The relevant comparison is therefore not only price per square metre, but also expected service life, project duration, disruption and technical risk.
Approche pratique du projet
- Visual and technical roof inspection.
- Determine which existing layers can remain.
- Substrate testing and, where useful, a test area.
- Select membrane, reinforcement, primer and detail products.
- Define coverage and layer build-up.
- Apply under suitable weather conditions.
- Inspect details and final layer.
Sources
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