What's the best joist layout for a hipped l shaped flat roof? If I use firring how do I make the hipped part? If I go down the route of a mono pitch around 10 degrees, can I just do a cut roof?
Without seeing the site or what the restrictions are, I would think of something like this as a starting point With some trusses and then cut the hip rafters etc.
I'm doing similar and I'm thinking of flat joisting all the shortest lengths. Then over the top running fitting pieces from east to west direction and having a drip edge to gutter off the flat roof at the western most red line on your drawing if that makes sense.
Ps , mine will be a single story extension so the main roof is unaffected, I abut against brick walls and will insert cavity trays
What pitch is the existing hipped roof? Where the hip on the existing terminates into your proposed new roof, could you not just bring the new roof up to the same level, taper it down using firrings (or keep the same pitch as your existing), and construct a diminishing or tapering valley rather than a hip. So invert the hip, basically....?
Existing roof is 34 degrees, new roof will be higher then the existing soffit height so I was going to either do a parapet or do a large over hang. I don't really want to re-roof the whole lot as ridge height will be higher than original so would need planning. [QUOTE="BMC2000, post: 1448633, member: 149096"Then over the top running fitting pieces from east to west direction and having a drip edge to gutter off the flat roof at the western most red line[/QUOTE] That would mean, for this roof, a 15m firring or 9m going top to bottom.
You are correct, I already have planning permission and it was a pig to get so I not going back to make amends
Wouldn't the planning permission have defined the shape of the roof and then BC will confirm how its going to be implemented ?