Compare complete systems
- Condition and type of structural deck
- Vapour-control layer and condensation design
- Insulation type, thickness and continuity
- Designed falls and drainage outlets
- Membrane compatibility at kerbs and penetrations
- Fire and wind-uplift requirements
- Installer competence and meaningful guarantee
Resitrix SKW
Resitrix SKW is a reinforced EPDM membrane with a self-adhesive underside and hot-air-welded seams. It is suited to many detailed domestic and commercial roofs when installed as a compatible system. J&L Welch provides a 20-year guarantee on its agreed Resitrix SKW installations.
Modern reinforced felt
A properly specified multi-layer bituminous system remains a credible and cost-conscious option. It should not be confused with lightweight shed felt. J&L Welch provides a 10-year guarantee on its agreed felt flat-roof installations.
Where overlays go wrong
- Wet insulation is trapped
- A weak deck is concealed
- Door and outlet heights become unworkable
- Existing falls are not corrected
- The new membrane is chemically or mechanically incompatible
What your quotation should confirm
- Full layer-by-layer roof build-up
- Deck replacement allowance
- Falls, outlets and overflow provision
- Perimeter, kerb and penetration details
- Manufacturer preparation and installation requirements
- Guarantee issuer and duration
Useful primary sources
These links provide regulatory, trade-body or manufacturer information. Product guidance does not replace a property-specific specification.
What to check next
- Compare the full build-up, not only the top layer
- Check manufacturer detailing at outlets and edges
- Ask who provides workmanship and material cover
When should you ask a roofer to inspect it?
Arrange a survey for recurring leaks, soft or deflected decking, persistent ponding, split details, blistering or an unknown build-up. Openings may be needed before anyone can responsibly confirm whether an overlay is suitable or the roof must be stripped.
Safety first: do not climb onto a roof without suitable access, training and protection. Keep clear of loose coverings, unstable ceilings and water near electrical fittings.
Would you like a property-specific answer?
Request an inspection and written quotation from J&L Welch.
No deposit is required. Payment is due on completion within seven days, with the agreed scope and price confirmed in writing.