I live in an older 1.5-story house built in 1981. This spring, I plan to replace our roof, which currently consists of Planja TP sheet metal and masonite. The new roof will consist of rough-cut planks, felt, and concrete tiles.
There will be an additional weight of about 35kg/m2 compared to what I have today. I have managed to obtain the roof truss drawings from a house built in 2008 by the same house manufacturer. This house has a light under-roof with concrete tiles. I believe the weight of the rough-cut planks is negligible.
My roof trusses are almost identical in construction to the newer house, with the same measurements and timber dimensions except for the collar tie. My collar tie consists of two 34*70 pieces nailed from the side. The newer house has a collar tie of 45*120 attached with nail plates.
The major difference is the timber quality. My trusses are made of timber quality Ö, and the newer trusses are built with K30, K24, and K12. The only information I have found online is that Ö stands for other timber in the classification.
Does anyone know how much difference there is between Ö timber and K30 timber? Or know where there is a table or something similar?
If needed, how can I most easily reinforce my roof trusses to support the extra weight?
The attic is currently unfinished but will be finished in the future. I will then need to make a furring of the trusses to accommodate the insulation. If I make this furring with nail plates, could it be sufficient as reinforcement for my trusses?
This was a long first post.
/Christian
There will be an additional weight of about 35kg/m2 compared to what I have today. I have managed to obtain the roof truss drawings from a house built in 2008 by the same house manufacturer. This house has a light under-roof with concrete tiles. I believe the weight of the rough-cut planks is negligible.
My roof trusses are almost identical in construction to the newer house, with the same measurements and timber dimensions except for the collar tie. My collar tie consists of two 34*70 pieces nailed from the side. The newer house has a collar tie of 45*120 attached with nail plates.
The major difference is the timber quality. My trusses are made of timber quality Ö, and the newer trusses are built with K30, K24, and K12. The only information I have found online is that Ö stands for other timber in the classification.
Does anyone know how much difference there is between Ö timber and K30 timber? Or know where there is a table or something similar?
If needed, how can I most easily reinforce my roof trusses to support the extra weight?
The attic is currently unfinished but will be finished in the future. I will then need to make a furring of the trusses to accommodate the insulation. If I make this furring with nail plates, could it be sufficient as reinforcement for my trusses?
This was a long first post.
/Christian
Talk to a constructor and ask him/her to look at your roof trusses. They can calculate it and possibly come up with suggestions on how you can proceed.