John Rumm wrote:
oblong wrote:

Reading around, it seems like the main risk is rotten joists / beans
which is not a problem here due to newness of the house.

With a modern house the floor will be designed to meet current building
regs or something close to them. These tend to assume a floor load of
something like 100kg/m^2 of floor. So in a large room this is quite a
substantial total load.

Most floors would be designed to the TRADA tables, which use loads of
1.5kN/m² or 150kg/m² plus a point load of 1.4kN (140kg) acting together.
They also don't take account of flooring acting as a diaphram.

Note also that this load is not the point at which the floor will fail,
but is spec that it must exceed or equal and not deflect by more than a
small amount (14mm on long spans, or 0.003 times the length of the joist
(in mm) on shorter ones). The failure point may well be significantly
(probably more than double) the max load for building regs purposes.

Correct. On longer joists, the limiting factor is deflection, so just
over the limit the floor may appear to bounce & there may be some
hairline cracks in the ceiling below, but the floor won't fall through.

So in summary, nothing to worry about unless you have huge amounts of
heavy equipment in the room already. By all means set it up over the
supporting wall - that should eliminate any remaining doubt.

And as someone else said, lay some plywood sheets down to spread the
load across a wider area (and also to stop any water getting through).

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