Camiel,
Usually 250Kg - 300Kg per m2. Your 500kg on that surface should not be
a problem, there is a large safety margin.
I used to have 6 H960 racks next to each other, with an average of 150Kg
on a concrete floor made of 'kanaalplaten'. Your floor is a reenforced
concrete poured type and an integral part of the walls when the house was
build (gietbouw box constructie, sorry for the Dutch here).
For comparison, the wooden floor in my garage is also designed for 250Kg
per m2, and you have seen how that has been made.
Ed
On 7/26/12, Jay jaeger <cube1 at charter.net>
wrote:
One thing you should also consider is the weight
loading you are going
to
put on your attic, and how it is distributed, less your ceiling sag over
time.
Good point. I hadn't considered that. I figure it'll weigh around 500
kg alltogether. The surface area is 150 x 70 cm = 1,2 m2. That's 416
kg/m2. The floor is made out of concrete, and I'm putting it into a
corner of two load-bearing walls. I'll make a call to the housing
corporation to find out what the maximum load is.
Camiel
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