I am rebuilding a single story kitchen / utility rooms extension on exsiting footprint with new 1m foundations in a semi detached house built in 1900. I cannot use the party wall which has a neighbours parapet wall on topas a load bearing wall for the new roof which is replacing a flat roof.
Roof Dimensions 8.1m x 4m
Pitch of roof is 12.5 degrees
Rafters span the 8.1m
Load bearing walls:
1. Existing main house 9inch red brick cavity wall.
2. New internal load bearing 9” hollow concrete block wall on new 1m foundation @ 5.2m form the main house wall
3. New Load bearing 9” external red brick and internal celcon block 100mm cavity wall @ 8.1m.
11 rafters to be hung from main house wall on wall plate screwed to wall and joist hangers attached to a wall timber . Rafters will then run through the internal block wall to new gable wall. I will then be using counter battens for fixing tile battens.
Tiles Redland regent @ 4.6 Tones per 1000.
We are going to use 340 tiles which = 1588kg or 3500 lb
My questions are. Are the walls adequate for the roof weight?
What would be the optimum rafter dimensions at 16” centres over this span keeping in mind that it might snow again some day!
javascript:emoticon('8)')
Cool
I have considered a hipped roof but for many reasons decided against it.
Any other comments members have would always be appreciated.
Thanks
GMS
Roof Dimensions 8.1m x 4m
Pitch of roof is 12.5 degrees
Rafters span the 8.1m
Load bearing walls:
1. Existing main house 9inch red brick cavity wall.
2. New internal load bearing 9” hollow concrete block wall on new 1m foundation @ 5.2m form the main house wall
3. New Load bearing 9” external red brick and internal celcon block 100mm cavity wall @ 8.1m.
11 rafters to be hung from main house wall on wall plate screwed to wall and joist hangers attached to a wall timber . Rafters will then run through the internal block wall to new gable wall. I will then be using counter battens for fixing tile battens.
Tiles Redland regent @ 4.6 Tones per 1000.
We are going to use 340 tiles which = 1588kg or 3500 lb
My questions are. Are the walls adequate for the roof weight?
What would be the optimum rafter dimensions at 16” centres over this span keeping in mind that it might snow again some day!
javascript:emoticon('8)')
Cool
I have considered a hipped roof but for many reasons decided against it.
Any other comments members have would always be appreciated.
Thanks
GMS