Problems/load-bearing capacity of attic/current structural analysis/assessment

Hello to all forum participants,

I have been a silent reader here in the forum for a long time and have already gotten some questions answered this way. Now I have a question and hope that someone can help me before I contact our structural engineer about it: In 2013, we built a staggered shed roof house (KFW70 standard) and moved in at the beginning of 2014. I am now considering equipping the attic in our large shed with a substructure made of 50x30 squared timber and laying tongue-and-groove boards about 22mm thick on top of it so that we can use the attic as storage space. The attic is insulated, under the insulation there is a vapor barrier, and beneath that the typical construction of battens and drywall panels. I now have a problem with our structural calculation: Either I am too stupid to read it correctly, or there is a missing specification: The indication of the maximum force/weight with which I am allowed to load our attic. I would be glad if a specialist could comment here whether I am overlooking something or if the specification is actually missing.

Greetings from Frankenthal,
Marco

Hello Marco,

the information you are looking for is not included, but it doesn't have to be. I assume you want to install an additional ceiling at the level of item D2. Is that correct? The duplications are presumably only designed for the drywall ceiling or I assume they are not designed at all since nothing would come through from the underside due to the OSB panels. As far as I can see, the rafters still have sufficient reserves. So if you want to do that, I would have the structural engineer calculate how to reinforce the item so that it can bear 200kg/m² there.

Regards Ronny

Hi Ronny,

ok, thanks for the info and assessment. It is correct, it is a plank flooring on level D2 that I want to create. I will call our structural engineer and ask what load can currently be expected. Possibly that would already be sufficient.

Thanks again.

Regards,

Marco