What size steel thread and bolts for chemical resin to wall plate

[Michael Zenonos]

I am doing an extension 5.5m long and 3 m wide. The roof has to span longways and joists are 300mm deep. I have to put a timber wall plate to the existing house wall and wanted to know what size bolts I need. I was thinking M12 200mm.

Any help with the size and spacings of the bolts would be appreciated.

 

[catlad]

One between every joist 120mm unless you have a solid wall

 

[Michael Zenonos]

The wall plate is on a solid brick wall. It sure what size bolts to use

 

[oldbutnotdead]

Not wanting to teach granny to suck eggs but you sure it is a solid full brick wall & not a cavity brick wall?

 

[Michael Zenonos]

Yes the wall is solid no cavity. It’s Victorian

 

[catlad]

Well in that case you can use 200mm

 

[^woody^]

You would only need a fixing depth of 80mm, and no need for resin unless the bricks are crumbly.