Thoughts on how ill be constructing this roof. Below in pic is the spacing of the rafters and joist. Im going for 600mm spaing and will have 3 rafters each side of the opes tust will have 2x 780x980 veluxes together. Ive left a 1668mm ope for the double veluxes and can adjust to suit for whatever flashing kit ill get. Im going to try and alter the new tile combi flashing kit to suit the older type veluxes.
Ill be bolting the triple rafters and joist together with these M12 bolts, timber to timber fixings, plate and nuts spaced at .400mm centers. Would i get away with doubles instead of triples each side of the ope? If i go with triple rafters, do i really need triple joists too or is double joist with triple rafters acceptable?
Ill also be using timco hex head screws. I have 2 20kg boxes of 4inch galv round wire nails in the shed i can use but was thinking of getting some 90mm pasload nails but locally cant get ring shanks in this size. Only 75mm. What about smooth shank, any good for roofing?
The middle velux is left of center to accomodate a stud wall from front to back seeing theres a steel beam at this point.
All my spaing along with the 44mm thickness of timber with the 50mm gaps each side of the end roofing all correspondes with my measurements between each gable.
Im in two minds to put double rafters and joists on the far left for an ope for staircase here or use between the triple raters. If i add the double rafters on the far left beside the gable ill be left with a 924mm ope if i cut the center rafter. Enough ope for a staircase!
On the right hand side, therell be an extra
800-850mm for the 300mm cavity plus 200mm stone and 100-150mm soffit overhang. On the left, itll be 300mm cavity and 100-150mm soffit 450mm total. With this, i could move the veluxes over slightly by a spacing. This is more for astetics .
A Double 6x2 or 4x2 purlin with a plumb strut at each rafter space. If i remember right, it can be a mtr apart but i dont mind installing one under each rather.
9x2 c16s for all joist and noggings.
C24 for all rafters, trimmers, purlins and struts.
4x2 c16 for all collar ties.
2X1.5 treated battens
Breathable felt.
6x2 roof ladders.
Concrete roof tiles..
Ill be bolting the triple rafters and joist together with these M12 bolts, timber to timber fixings, plate and nuts spaced at .400mm centers. Would i get away with doubles instead of triples each side of the ope? If i go with triple rafters, do i really need triple joists too or is double joist with triple rafters acceptable?
Ill also be using timco hex head screws. I have 2 20kg boxes of 4inch galv round wire nails in the shed i can use but was thinking of getting some 90mm pasload nails but locally cant get ring shanks in this size. Only 75mm. What about smooth shank, any good for roofing?
The middle velux is left of center to accomodate a stud wall from front to back seeing theres a steel beam at this point.
All my spaing along with the 44mm thickness of timber with the 50mm gaps each side of the end roofing all correspondes with my measurements between each gable.
Im in two minds to put double rafters and joists on the far left for an ope for staircase here or use between the triple raters. If i add the double rafters on the far left beside the gable ill be left with a 924mm ope if i cut the center rafter. Enough ope for a staircase!
On the right hand side, therell be an extra
800-850mm for the 300mm cavity plus 200mm stone and 100-150mm soffit overhang. On the left, itll be 300mm cavity and 100-150mm soffit 450mm total. With this, i could move the veluxes over slightly by a spacing. This is more for astetics .
A Double 6x2 or 4x2 purlin with a plumb strut at each rafter space. If i remember right, it can be a mtr apart but i dont mind installing one under each rather.
9x2 c16s for all joist and noggings.
C24 for all rafters, trimmers, purlins and struts.
4x2 c16 for all collar ties.
2X1.5 treated battens
Breathable felt.
6x2 roof ladders.
Concrete roof tiles..
