Weight of CL slabs

[Maidi Eriksson]

Going to build an additional floor on a small old house. I find very large CLT floor structures interesting but wonder if they weigh too much. The CLT panels should rest on an attic joist that should be leveled with as few pressure points as possible.

 

[Lulaua]

Depends on the thickness of the KL-skiva, which in turn mainly depends on the span it needs to cover.

 

[Maidi Eriksson]

It depends on the thickness of the CLT panel, which in turn mainly depends on the span it needs to cover.

I was hoping to find out in the thread. What thickness is required if, for example, you have supports 2 meters apart? What would the weight per square meter be then?

 

[Rickard.]

CLT weighs approximately 500kg/m3, which I assume would result in a typical floor structure weighing around 100-150kg/m2.

Martinssons (I'm sure all of them) has a good PDF with information about CLT where weight, spans, etc. are listed if you want to geek out with facts.

 

[Maidi Eriksson]

Sounds boringly heavy. The surface is 50 sqm. So it becomes 5 tons at 100 kg/sqm as I understand it. But thanks for the answer.

 

[Rickard.]

Sounds heavily dull. The area is 50 sqm. So it becomes 5 tons at 100 kg/sqm if I understand. But thanks for the answer.

I must admit that I've only seen KL for commercial buildings and have no idea what thicknesses are involved for you, so my estimate (read guess) may well be on the high side.

A typical wooden floor is generally estimated to weigh 50kg/m2.