We have a 1970/71 'ish dormer bungalow style semi (with the flat roof's now pitched)
The attic space inside the main roof area (the pitches over the original dormer flat roofs are not accessible) is only small, approx 6 foot head height immediately below the bridge board.
The purlins are 8.75" x 3" and extend into the brickwork. Joists are 5" x 2" (approx 47cm between centres). The roof rafters extend down over and are knocked to sit on and are nailed to the purlins and continue down the pitch of the roof and are nailed to the joists. Below the purlins are two further horizontal support beams that are fixed to the purlins via vertical and heafty diagonal supports.
- other end is roughly mirror image.
Now, since the house is constructed as a dormer style, the front and rear upstairs walls are not brick but a seeming double plasterboard, batten, vertical tile affair. The external side wall does extend up the full height of the dormer and is brick as is the party wall between the two. Since there is effectively no brick structure front nor back and the roof originally (and still does under the added pitches) extends into a flat roof over the dormers, do the attic joists sit on anything of any real structure (no wall plates?) or are they totally supported via the roof structure, i.e. their ends being attached to the roof rafters (which are in turn supported on the purlins) and also by the horizontal supports beneath the purlins (these are roughly nailed through into each joist passing beneath).
I've boarded it up there with T&G floor panels but I'd like to better know the construction style.
Thanks all...
The attic space inside the main roof area (the pitches over the original dormer flat roofs are not accessible) is only small, approx 6 foot head height immediately below the bridge board.
The purlins are 8.75" x 3" and extend into the brickwork. Joists are 5" x 2" (approx 47cm between centres). The roof rafters extend down over and are knocked to sit on and are nailed to the purlins and continue down the pitch of the roof and are nailed to the joists. Below the purlins are two further horizontal support beams that are fixed to the purlins via vertical and heafty diagonal supports.
Now, since the house is constructed as a dormer style, the front and rear upstairs walls are not brick but a seeming double plasterboard, batten, vertical tile affair. The external side wall does extend up the full height of the dormer and is brick as is the party wall between the two. Since there is effectively no brick structure front nor back and the roof originally (and still does under the added pitches) extends into a flat roof over the dormers, do the attic joists sit on anything of any real structure (no wall plates?) or are they totally supported via the roof structure, i.e. their ends being attached to the roof rafters (which are in turn supported on the purlins) and also by the horizontal supports beneath the purlins (these are roughly nailed through into each joist passing beneath).
I've boarded it up there with T&G floor panels but I'd like to better know the construction style.
Thanks all...