Winslow Park, UK: Metal roof waterproofing
In 2025, the metal roof waterproofing at Winslow Park, UK was made with Polyurea Rayston.
01 · Project overview
What is this project?
In 2025, the metal roof waterproofing at Winslow Park, UK was made with Polyurea Rayston. Northern weather is rain, long damp spells and a low sun. The film has to stick while the deck stays wet for weeks.
This one is metal roof waterproofing.
Polyurea Rayston is hot-sprayed. It gels in about four seconds and the usual build is 1.5 to 2 mm.
Krypton Chemical makes the resin. The crew on site applies it. On Winslow Park, UK the details have to get the same film as the open field, and the cure has to finish before the building goes back to work.
| Project | Winslow Park, UK: Metal roof waterproofing |
|---|---|
| Place | UK – Irlanda |
| Year | 2025 |
| Line | Waterproofing |
| Products | Polyurea Rayston |
02 · The challenge
What did this structure ask of the system?
A metal roof is a field of laps, fixings and ribs. Water does not come through the middle of a sound sheet. It comes through a lap that opens in the heat, or a fixing that was never sealed.
Winslow Park, UK: Metal roof waterproofing has to follow those ribs. A coating that only covers the flat of the panel leaves the joint bare.
03 · The solution
Which system was trusted here?
The system trusted here is the one named for the job: Polyurea Rayston. It is chosen because it matches the substrate and the exposure, not because every building wants the same can.
On a roof the membrane has to follow outlets and upstands at the same thickness as the field. An exposed aromatic film takes a topcoat if the colour will be seen.
04 · Application
How is the system built?
Where the system is Polyurea Rayston, the concrete or the prepared deck is not sprayed over dirt. Pull-off should be at least 1.4 N/mm2. Cracks are cut out and filled. Moisture in the concrete stays under 4 percent, with the concrete between 10 and 40 degrees C. If the slab is damp behind, two coats of epoxy primer go on, the second blinded with quartz. That bond is what stops a blister when the deck heats up.
The spray is hot. Resin about 65 degrees C, isocyanate about 75 degrees C, hose about 65 degrees C, and at least 140 bar at the gun. The usual build is 1.5 to 2.0 kg per square metre, about 1.5 to 2 mm. Gel time is about 4 seconds at 25 degrees C. Typical elongation is 324 percent and tensile strength is 16.2 MPa. Those are the product’s figures, not a thickness measured on Winslow Park, UK: Metal roof waterproofing. An aromatic film shifts colour in the sun, so an exposed face takes an aliphatic topcoat. A buried lining does not need that coat to keep its strength.
On Winslow Park, UK: Metal roof waterproofing the roof fails at the edge long before it fails in the field. Parapets, outlets, plant plinths and laps are detailed first, with the same system, at the same thickness. A bay can be perfect and the ceiling still stains if the outlet was a collar of mastic.
The deck moves between the hot afternoon and the night. The membrane has to move with it. A rigid coat maps every crack in the substrate onto the ceiling. Thermal movement is the reason an elastic system is on a roof like this, not a preference for a particular can.
Where the film stays in the sun, colour and waterproofing are two layers. The membrane keeps the water out. An aliphatic coat keeps the appearance. Skipping the topcoat because the membrane is already waterproof is how a sound roof starts to look failed, and then gets recoated for the wrong reason.
05 · Results
What does a job like this stand behind?
Winslow Park, UK: Metal roof waterproofing has one standard. The coating is still doing its job after the building is back in use, at the details as well as in the middle.
Figures for cure, thickness and strength, where they are given, come from the product data sheets. They are not a test cut out of this building.
What this asks of Winslow Park, UK: Metal roof waterproofing is workmanship at the difficult line. The open field is the easy part of a resin job. Outlets, edges, penetrations and changes of plane are where thickness goes missing, and where water or wear finds the gap. The same products and the same care belong there, and the cure is allowed to finish before the building goes back into use. That is the difference between a coating that was simply applied and a system that stays in service.
06 · Products
Products on this job
Polyurea Rayston
Named on this project. The data sheet carries the application window and the typical figures.
07 · FAQ
Frequently asked questions
Where is this project?
Winslow Park, UK: Metal roof waterproofing. UK – Irlanda
When was the work done?
2025.
Which products were used?
Polyurea Rayston.
How thick is the polyurea?
The usual spray is 1.5 to 2.0 kg per square metre, about 1.5 to 2 mm. That is guidance from the data sheet, not a gauge reading on this roof.
Does sunlight damage it?
The pure polyurea is aromatic, so colour can shift while strength stays. An aliphatic topcoat is used where the film stays in the sun.