OORED? n the dos and don’ts of preparing substrates and applying floor screeds.
slightly to help ventilate the room. You need some air change in the room but you don’t want them open so wide that you get a ripple effect on the screed.
Also, put a couple of used empty bags in the doorway to wipe your feet on once you’ve finished the room otherwise you’ll end up walking screed all through the house, on the lawn and in your van.
COMMON MISTAKES One of the common mistakes people make is that they get so excited about starting a job that they don’t prepare properly. One minute they are happily pumping floor screed and the next they’re stuck in a corner screaming for a bucket to put the hose in. Make sure you understand the geography of the building you’re working on.
Another mistake people tend to make is they’ll set up the machine to run, make the relevant checks and then think they never have to do another flow test. However, what they have to understand is that the machine will wear and tear slightly throughout the operation. To ensure materials are mixed correctly, a flow ring measurement is essential both before and during a screed application. A flow test should be carried out every tonne or 15 minutes, whichever comes first, for the first hour and then every 20 minutes if results are stable.
The most critical point of any screed installation is the last square metre because it’s the last thing you do when you’re tired and trying to complete the job and leave – it’s also the first metre the customer sees. It is the most important point of any floor because if your customer sees a terrible finish in that last metre they’re going to be very critical of the rest of the floor. If that’s in good order, then the chances are everything else will be.
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SUBFLOOR PREPARATION | 35
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