Hello! I have recently insulated my garage and in connection with this built an interior ceiling/attic. I don't plan on storing any really heavy items in the attic, but I still think it would be interesting to get an idea of how much it might hold. Is it possible to make an estimation of this, or is there anyone with a similar construction who can share their experiences?
The construction is*
- 7 meter span (8 meters long)
- W-trusses at cc 120, with bottom chords in 120x45. These are spliced with nail plates in the middle.
- I have reinforced the joists with 195x45 at cc 60.
> Partly, I have built new joists by splicing together 4+3 m. The splices are also in 195x45, 150 cm long on both sides, glued and screwed. I have alternated which direction the joints are.
> Partly, I have glued and screwed 195x45 on each truss (also 4+3 meters, with a splice on the outside of the truss)
- 28mm batten and plasterboard on the underside, floor in 20 mm rough flooring in the attic.
Roughly like this, but the joints are offset and the splices are only 150 cm
I have estimated the roof’s own weight to approximately 1700 kg, i.e., about 30 kg/m2.
I bought the timber through an acquaintance at the local sawmill, but forgot to ask about the quality (strength value, or whatever it is called) of the beams, so I'm not sure about that. But "common" construction timber, if such a thing exists
How much can I safely load onto the attic without the roof collapsing on me?
