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I'm one step ahead I've been using 80mm :) So bolts are only necessary for sistering joists or where loads are going to be higher such as trimmers for staircases?

Hi. I have made a roof with the velux openings. Both trimmers and rafters have been doubled up. I have screwed them together and used joist hangers where needed. What is purpose of bolting them when the rafters run full span and the trimmers all sit in hangers? I have screwed them with...

Hi. My lean to roof will have air vents in front soffit to allow air into roof. Inside, the ceiling will be levelled with living room. Is an air brick on side necessary in roof wall to aid airflow? Or am I fine without one. Seen a few extensions with air bricks for roof. Thanks

Hi. I have a 15 degree pitched roof on extension. On my main roof I have sandtoft double roman tiles. I want to use matching tiles on extension. The minimum headlap for tiles on a 17.5 degree pitch is 100mm. For a 22.5 degree it's 75mm. Technical spec says 120mm maximum headlap but doesn't...

What Is maximum spacing for bolts?

47mm board + 75mm wall = 122mm 18mm protruding for washer and nut. Even if it were to go a little in cavity I've read there's no issues. Cheers

Anyone?

What is spacing for ledger board that spans 4.3m long and is beating on internal leaf block work? The board is 7x2 the rafters will sit on top off the ledger board. I was thinking 750mm centres staggered but starting at 200mm from bearing. I'm using 140mm m12 through bolts. Thanks

I've put lintel up few days ago. Realised the front one has vertical crack in centre. Won't be supporting anything. Would it be OK or do I need to change it.

Hi. Does the gable wall on a single storey lean to extension need to be strapped to rafters? I have a feeling its not required however read it somewhere that it has to be done. Thanks

Awesome. Thank you very much mr woody.

@^woody^ thank you. my next question is how do I go about fitting one?

Cheers. How about where the roof will join the existing property? Will tray be required. The complete house Will be rendered Externally.

Hi. Is it necessary to put a cavity tray/dpm above the window and door openings on a single storey extension with lean to roof and will be rendered Externally. Or is this more for double storey? Regards

The above Span is horizontal. The diagonal clear span is 3.8m

Conventional flat ceiling with separate ceiling joists

Hi. I have a 4 metre extension. I'm trying to work out rafter size. I'm trying to achieve a 15 degree slope. Will be using interlocking double roman tiles. The clear span from ledger to wall plate is 3.68 metres. I will be using c24 rafters with no purlin. There will be 2 sky windows. The...

Delete thread.

Hi. Yes I'm aware of height to be between 500mm and 1000mm from ground level. Problem is I have put the inner leaf blocks up so can the tray be fitted or am I better off grinding inch of mortar and inserting dpm as tray. I have dpm 1000ga which is 250micro units (0.25mm) so that should be fine...

Hate using grinder. Use sds with sharp chisel.