I'm in the process of getting quotes for a 66m2 2storey extension on my 1983 house.
Our current floor under the laminate is concrete. Our extension will mean there is a room across the back of the house that will be 1/2 orginal and 1/2 new build.
We have had 10 quotes and we've managed to get our selection of builders down to 2.
1 builders quote (£2k cheaper) references beam and weyroc flooring the other mentions a concrete floor through out.
I have been told the joists + weyroc is so much easier to get absolutely level compared to concrete however will it not make a hollow sound when I walk over it? and will there not be an apparent join between the concrete and joists? I may ask for concrete floors but will this cost extra?
there is no reason at all why either method will not yield a perfectly flat and linear finish. there needn't be any immediate evidence of a join, at least visually, either way as long as the work is done to a good standard.
you may end up with the hollow sound, which would give away the transition if using joists and weyroc. the extent would largely depend on the type of flooring. a hard floor would obviously give a hollower sound than carpet.
it's really a personal choice, both methods have their advantages. joists may possibly be quicker and cheaper plus you wouldn't have to allow curing time before the final floor can go down on top of it.
though if budget and time allows i think i'd prefer to concrete.
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