Leaks rarely begin in the open field. They begin at drains, upstands, penetrations and failed laps. Specify the system around the roof you actually have.
The waterproofing route should be selected from the substrate, existing system, UV exposure, movement and drainage—not from a product name alone. Rayson SealForce systems provide liquid-applied routes for exposed roofs, wet details and specialist applications, supported by published technical data sheets.
Choose the roof condition. The image, technical priority and enquiry brief change with it.
Survey cracks, falls and existing repairs before choosing the exposed membrane route. Ponding caused by failed falls should be corrected—not hidden under another coating.
An overcoating route starts with adhesion, moisture and compatibility. Failed, debonded or waterlogged areas still need to be identified and repaired first.
Metal condition, corrosion, laps, fixings and thermal movement decide the detailing route before a compatible waterproof coating is selected.
Drains, upstands, penetrations and plinths interrupt the open roof field. Their preparation and detailing should be resolved before the main membrane goes down.
Useful where a seamless field and work around complex roof details are priorities.
A specialist application route for projects where equipment, access and programme support it.
Retain sound areas only after checking condition, moisture, adhesion and compatibility.
| Decision | Cold-applied coating | Spray-applied route | Sheet membrane |
|---|---|---|---|
| Field | Seamless | Seamless | Lapped sheets |
| Complex details | Applied around geometry | Requires controlled specialist application | Cut and detailed around geometry |
| Open flame | Not required | Not required | Depends on the selected sheet system |
| Selection basis | Substrate, geometry, condition, access, occupancy and project programme | ||
Resolve the substrate and details first, then build the compatible waterproofing route. The illustration explains the roles—not a universal specification.
Review surface-preparation principles
These are preliminary directions. Confirm substrate preparation, compatibility, application and timing against the current TDS before work begins.
Cold-applied aliphatic polyurea route for exposed waterproofing applications.
Elastic polyurea waterproofing membrane for selected wet-area and detail applications.
Spray-applied polyurea route for specialist waterproofing and containment applications.
Non-sag epoxy repair compound for selected concrete repair and detail-preparation work.
Send wide roof photos, close-ups of leaks and details, the approximate area and your work window. We will review the starting conditions and respond within one working day.
Answer four questions about your surface and conditions to shortlist suitable Rayson systems.
Find your systemEstimate material quantities from your floor area, coats and coverage rate.
Estimate quantitiesOpen technical data sheets for every Rayson product — no forms, no gating.
Open the libraryThe correct route depends on the existing substrate, UV exposure, movement, ponding risk and condition of drains, upstands and penetrations. For exposed roofs, Rayson SealForce RC40 is a cold-applied aliphatic polyurea membrane designed for UV-exposed applications. Confirm the complete substrate preparation and build-up against the product TDS and a roof assessment.
A sound and compatible existing membrane may be suitable for an overcoating route, but failed, debonded or waterlogged areas still need to be identified and removed or repaired. Adhesion, moisture and compatibility should be assessed before a system is selected.
Liquid-applied membranes create a seamless field and can simplify work around complex details without open-flame application. Sheet membranes remain familiar on large, regular areas. The better route depends on the substrate, roof geometry, occupancy, access and condition of the existing waterproofing.
A reflective exposed roof surface can reduce solar heat absorption at the roof. The relevance to a project depends on roof colour, construction and operating conditions. Review any stated product performance against the current SealForce RC40 technical data sheet.
They are assessed and detailed before the field membrane is applied. Unsound material is removed, repairs are reinstated and transitions are prepared so the selected waterproofing system can remain continuous. The exact detail depends on crack movement, substrate condition and roof geometry.
Cost depends on roof area, existing membrane condition, repairs, access, detail count, selected system and work window. Send wide roof photos, close-ups of leaks and details, and the approximate area for a project-specific review.
Programme length depends on preparation, repairs, weather, area, access and the selected coating system. Return-to-service and overcoating intervals must be checked against the current product TDS and actual site conditions.
Tell us your surface, area and timeline — our Singapore technical team will recommend a practical system and price it fast.
Rayson assistant
Answers from Rayson's own product information
Guidance only — confirm specifications with the Rayson technical team.