Dobbies Garden Centre Pond Lining
Ponds at a Dobbies garden centre in the United Kingdom were lined with Impermax.
Overview
Ponds at a Dobbies garden centre in the United Kingdom were lined with Impermax.
| Place | United Kingdom |
|---|---|
| Site | Dobbies Garden Centre ponds |
| Membrane | Impermax |
Challenge
A garden-centre pond is looked at every day. The water level is the inspection. A liner that fights the cove, the shelves and the pipe penetrations leaves a wrinkle, and a wrinkle is a path. Impermax is liquid, so it can be rolled into those changes of plane instead of asking the pond to be a rectangle.
The membrane and the duty are a pond lining. Coves, shelves and pipe entries are the work, not a flat floor in the middle of the basin.
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.
Standing water should wait until the film has its final hardness, 10 to 15 days. A pond filled the next morning is a test of a film that is not finished. On a garden-centre pond that test is public: the level drops, and everyone can see it.
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. the lining stays underwater, and a holiday at the outlet or the cove drains the pond into the soil. 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
The Dobbies ponds are lined in Impermax, with the coves and outlets in the same coats as the floor of the basin.
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 these ponds that matters because the lining stays underwater, and a holiday at the outlet or the cove drains the pond into the soil.
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 these ponds 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 these ponds 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 these ponds.
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 these ponds. The ETA for the system is 06/0263.