did i say the 3 15 stone people were only going to stand there for a few secs?
theres no need to get defensive, but, regardless, you implied it. you put forward a *test* to have three people stand in a spot in a house to see if the floor collapses, somehow i dont see that test lasting more than a few minutes.
they could stand there for a minute, hour, day, week, month, year ... they still ain't gonna fall through the floor
the longer the weight is on the floor, the more chance the floorboards have of buckling. i would agree if you said 'probably aint gonna fall through the floor', but even still, like i said, it depends on a lot of factors. for example if you placed that quarter tonne weight in the middle of the floor in a large room in an old house where there is likely to be rotten wood or perhaps termites, it may not hold for long.