How to Apply Winkler ONE — Liquid Roof Membrane

Refurb & overlay waterproofing for flat and low-slope roofs (illustration only)

Winkler ONE is a single-component, liquid-applied waterproofing membrane for flat and low-slope roofs. It’s ideal for refurb overlays on aged felt/asphalt and for complex detailing around upstands, skylights and penetrations. With the correct primer and reinforcement, it forms a seamless, durable and UV-resistant system that can be built with anti-slip texture where foot traffic is expected.

1) Where Winkler ONE works best

• Aged bitumen felt/asphalt refurb (sound, well-adhered substrates)
• Concrete decks and gutters after proper preparation
• OSB/plywood decks (stable, fixed, primed)
• Complex details: upstands, outlets, internal/external corners, plant plinths

2) What you’ll need (map to your product listings)

• Winkler ONE liquid membrane (main coats)
• Winkler/compatible primer for the specific substrate (bitumen, concrete, timber, metal)
• Reinforcement fabric/bandage for corners, cracks, changes of plane and around penetrations
• Ultraflex Sealant (PU) for terminations and movement details
• Roof edge/drip trims, outlets and fixings compatible with liquid systems
• Optional anti-slip aggregate for walkways/balconies
• Prep kit: cleaner/degreaser, rollers/brushes/squeegee, masking, measuring tools
• PPE: gloves, eye protection, mask/respirator suitable for prep dust

3) Substrate checks (must pass before coating)

• Soundness: Existing coverings must be firmly bonded. Remove blisters, loose laps and friable areas; make good.
• Dryness & weather: Apply within temperature/humidity windows. Substrate must be dry and above dew point (no condensation).
• Falls & drainage: Ensure working outlets; correct ponding where practical.
• Cleanliness: Degrease, sweep and vacuum. Remove granules that are poorly adhered.

4) Preparation & priming

1. Detail repairs: fix laps, fill holes, re-bed flashing chases where needed.
2. Mask edges and sensitive areas. Pre-fit trims/outlets if the design requires.
3. Apply the matching primer for your substrate at the stated coverage. Allow to dry within the overcoat window.

5) Reinforcement at details (illustration only)

• Embed reinforcement fabric in a wet “stripe coat” of Winkler ONE at internal/external corners, around outlets/penetrations, across cracks and at changes of plane.
• Lap reinforcement per the system guidance (typically 50–100 mm).

6) Main membrane coats

1. First coat: Apply Winkler ONE by roller/brush (or squeegee then back-roll) to the specified wet-film thickness. Work in lanes; avoid puddling.
2. Second coat: After the first coat cures within the recoat window, apply a cross-rolled second coat to achieve the total dry-film thickness.
3. Anti-slip (optional): While the first or second coat is wet (as specified), broadcast fine/medium aggregate to refusal; de-flute and encapsulate with a finishing pass.

7) Terminations & joints

• Seal terminations with a Sealant and/or mechanically secure with termination bars into chases as designed.
• Movement joints must be detailed with compatible sealants/bandages—do not rigidly bridge active joints.

8) Curing & return to service

• Protect from rain, dust and foot traffic until cured. Respect minimum/maximum overcoat windows between coats.
• Re-open progressively: inspection → light foot traffic → full service, per data sheet and ambient conditions.

9) QA checks & common pitfalls

• Pinholes/holidays: Usually from thin application—measure WFT/DFT and re-coat locally.
• Poor adhesion: Almost always prep/primer related—improve cleaning, choose correct primer and re-test a small area.
• Dew-point issues: Condensation causes blushing/fish-eyes—check substrate temperature vs. dew point before coating.
• Ponding: Heavy standing water can stress any coating—design for drainage wherever possible.

10) Maintenance

• Clean periodically with neutral detergents; keep outlets clear.
• Inspect high-wear areas (walkways, plant bases) and re-coat when wear indicators show.

Product availability

Winkler ONE, matched primers, reinforcement fabric, Ultraflex Sealant, roof trims/outlets and anti-slip aggregates are available from Clever Shield. Use the website search bar to find the exact items and sizes for your project.