Hi,
I've got an old stone house with a 60's single storey lean-to kitchen extension, block cavity construction with asbestos roof.
I'm planning to remove the asbestos sheets & purlins fit a wall plate, pitching plate & rafters and as the roof is only 10° treat it as a warm flat roof with EPDM membrane finish. I can't increase the pitch as there is a landing window in the back wall of the house just above existing kitchen roof flashing.
My question is regarding the join between the rafter end and the pitching plate. Three of the rafters will be fitted with glazing bars with fixed rooflights the full 3m depth of the roof (ridge to eaves) thus it would look much better from inside if the rafters were cut plumb and fixed to the face of the pitching plate and not sat on top of a bearer plate.
I'm worried about the loadbearing on such a shallow angle (10°) between the rafter end & the pitching plate which I assume is normally screwed as its almost in the realms of a flat roof but I don't want to start fitting joist hangers, brackets etc as these will be on show. I've had an idea of leaving the M16 chemical anchors fixing the pitching plate a couple of inches longer and jig boring the end of the rafter to give added strength and it will also hide the fixings in the area of the windows.
Has anyone used this method or have any suggestions of an alternative fixing.
Thanks in advance.
Dave.
View media item 45201
I've got an old stone house with a 60's single storey lean-to kitchen extension, block cavity construction with asbestos roof.
I'm planning to remove the asbestos sheets & purlins fit a wall plate, pitching plate & rafters and as the roof is only 10° treat it as a warm flat roof with EPDM membrane finish. I can't increase the pitch as there is a landing window in the back wall of the house just above existing kitchen roof flashing.
My question is regarding the join between the rafter end and the pitching plate. Three of the rafters will be fitted with glazing bars with fixed rooflights the full 3m depth of the roof (ridge to eaves) thus it would look much better from inside if the rafters were cut plumb and fixed to the face of the pitching plate and not sat on top of a bearer plate.
I'm worried about the loadbearing on such a shallow angle (10°) between the rafter end & the pitching plate which I assume is normally screwed as its almost in the realms of a flat roof but I don't want to start fitting joist hangers, brackets etc as these will be on show. I've had an idea of leaving the M16 chemical anchors fixing the pitching plate a couple of inches longer and jig boring the end of the rafter to give added strength and it will also hide the fixings in the area of the windows.
Has anyone used this method or have any suggestions of an alternative fixing.
Thanks in advance.
Dave.
View media item 45201