We are working on an extension to a cottage. The extension is at an angle and the new roof should meet the old one. The roof pitch is the same on both the new and the old. The ridge of the new one will end up under the existing building's.
My question is how to attach the roof trusses we need to build to the existing roof? I don't have the measurements in my head but it's a span of maybe 2-2.5 meters at most so it will really only be one "real" truss and the others will be so low that they will more or less become compact wood pieces since we are building with at least 170 mm joists.
We are thinking of attaching joists along the valley line and then mitre and skew nail/screw the trusses into them.
Or what do you think?
We are working on an extension to a cottage. The extension is angled, and the new roof will meet the old one. The roof angle is the same on both new and old. The ridge of the new will be below that of the existing building.
My question is how do you attach the trusses we need to build to the existing roof? I don't have the measurements in my head, but it's probably a span of maybe 2-2.5 meters at most, so it really becomes just one "real" truss, and the others will be so low that they will more or less become compact pieces of wood since we're building with at least 170 mm studs.
We are thinking of attaching beams along the valley line and mitering and nailing/screwing in the trusses to them.
Or what do you say?
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We usually place the new trusses against the sheathing in the old roof, then place a beam against the new truss underneath so that it cannot slide downward.
Then we lay battens or other material we have available between the trusses in the valley for the sake of the top edges of the sheathing.
We usually place the new roof trusses against the roof boarding in the old roof, then a beam is placed against the new truss underneath so that it cannot slide downward.
Then we lay battens or any other material we have available between the rafters in the valley to support the ends of the roof boarding.
Thanks, sounds like what I had in mind too. A bit of "use what you have" and then some over-dimensioning on top of that.
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