How long between sprayed PUR and the screed?
Sprayed PUR sets in under 24 hours. The screed can follow as soon as the foam is sanded level and covered with a membrane, often within a few days depending on the site schedule.
Sprayed PUR sets in under 24 hours. The screed can follow as soon as the foam is sanded level and covered with a membrane, often within a few days depending on the site schedule.
Sprayed PUR has a scheduling advantage: unlike a screed, it does not require a long drying time. The interval between the two depends primarily on the intermediate steps.
The foam expands in a few seconds and hardens in less than 24 hours, as indicated on our page thermal insulation. During this time, avoid walking on it to prevent crushing. The spraying process is described in the data sheet sprayed PUR.
Once sprayed, the foam forms a slightly uneven surface. It is sanded down to the required height to provide a level base, which is essential for a screed of uniform thickness. A separation film is then laid before pouring, to ensure the cement paste does not stick to the insulation.
Once these steps are complete, there is no need to wait any longer. The actual timeline depends on the schedule: availability of the screeding team, potential installation of underfloor heating pipes, and approval of the levels. The full process is in our article on installing a screed.
Start from the finished floor level set by thresholds and adjoining rooms, measure down to the highest point of the slab, then subtract the floor finish and the screed: what is left is the space for insulation.
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