St Ambroi Stadium Waterproofing
St Ambroi football club stadium in France was refurbished with Impermax liquid waterproofing.
Overview
St Ambroi football club stadium in France was refurbished with Impermax liquid waterproofing.
| Place | France |
|---|---|
| Site | St Ambroi football club stadium |
| Work | Refurbishment |
| Membrane | Impermax |
Challenge
A football ground has concrete and metal details side by side. Rain on the stands is thrown at the joints between them. A refurbishment has to cross both materials in one film. A new lap cut to the old one repeats the line that was already tired.
The work is an Impermax refurbishment of the stadium. Concrete and metal meet in the same bay, and the film has to cross that joint without a new lap.
Solution
Impermax is Krypton Chemical’s cold-applied liquid polyurethane membrane. It goes on by roller, brush, spreader or airless equipment, in two coats of about 1 kg per square metre each. The coats are different colours, so a missed patch shows while the work is still open. A spiked roller is run while the coat is wet, to break bubbles before they set. A mesh is not required across the field. It is used at edges and corners, the places a liquid film is asked to turn.
Elongation is 450 to 600 percent and tensile strength is 2.5 to 4.3 MPa. Those figures are typical product data, measured on the product under stated conditions. They are not a cut taken from this job. On a surface that moves with heat, that elongation is why the film can stay with the substrate instead of cracking where the plane changes.
The substrate wants to be between 5 and 40 degrees C. Above 45 degrees C the work needs extra measures. Pot life is about 4 to 6 hours for 1 kg at 20 degrees C and 50 percent relative humidity. People can usually walk the film in one or two days. It reaches about 90 percent of its properties in three days. Final hardness takes 10 to 15 days, and standing water should wait for that. The European Technical Assessment is 06/0263, with CE marking for the 10-year and 25-year working-life categories. The system also carries a BBA agrément.
Cold-applied coats can be worked between events, without a torch over stands. The film still needs its cure before it is asked to hold water in a gutter. One or two days to walk is not the same as 10 to 15 days before standing water.
Application
Stir the pail slowly so settled solids come back and bubbles can leave. Do not thin it with a solvent that is not the Rayston PU solvent. The surface is cleaned, cracks and weak spots are dealt with first, then the two coats go down, including upstands and outlets in the same passes. Details are not left for a leftover tin at the end of the day.
On this job the same rule applies at every edge. rain on stands and roofs has to leave by outlets, and those outlets are where a refurbishment usually fails. A holiday in the second coat is a path. The colour change is how that path is seen before the surface is handed back. Outlets, upstands and fixings take the same two coats as the field, because water does not fail in the middle of a bay. It fails where the plane changes.
Results
St Ambroi stadium carries an Impermax membrane as a refurbishment, with edges and outlets in the same coats.
Products
Impermax
Cold-applied liquid polyurethane. Two coats at about 1 kg per square metre each. Elongation 450 to 600 percent. Those figures are typical product data.
FAQ
How is Impermax applied?
By roller, brush, spreader or airless equipment, in two coats of about 1 kg per square metre each. The coats are different colours so a holiday shows. On this ground that matters because rain on stands and roofs has to leave by outlets, and those outlets are where a refurbishment usually fails.
How long before the film can be walked?
Usually one or two days. About 90 percent of the properties are there in three days. Final hardness takes 10 to 15 days, and standing water should wait for that. On this ground a film that is walked or flooded early is still soft.
What temperature does the substrate need?
Between 5 and 40 degrees C. Above 45 degrees C the work needs extra measures. A surface in full sun can pass that even when the air feels moderate, and this ground is no exception.
What do the strength figures mean here?
Elongation is 450 to 600 percent and tensile strength is 2.5 to 4.3 MPa. Those are typical product data, not a test cut from this job. They are why the film can follow movement at upstands and outlets on this ground.
Where do the cure times come from?
From the Impermax technical data sheet, measured on the product under stated conditions. They are not a stopwatch reading from this ground. The ETA for the system is 06/0263.