Joists support for flat garage roof

27 Jul 2006
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United Kingdom
I am looking to extend my existing flat garage roof by approx 2m in length

Its worth mentioning that i am link detached

When the house was built, the joists between myself and my neighbor were installed by seemingly smashing holes in the brickwork on both properties and cutting a notch out of the joists
Rather than adopting this same method, my thought was to bolt 2m batten joists along both mine and my neighbors walls, and then use some joist hangers for the cross joists before boarding

Can anyone confirm if this is an acceptable approach and any regs around the size and type of wood required for my proposed wall and cross joists please ?

Thanks in advance
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Yes, simplest way is screw on wall plate, joist hangers and joists.

Size depends on span. If its 3metres then something like 6 x 2 C16 at 400 ctrs
thanks for the quick reply Notch7

Distance/span between the properties is 2500mm

So when you say "screw on wall plate", are you referring to the joist that i planned to bolt to each property, or something else please ?

This is the sort of setup that i was planning :

...with the battens fastened to each property (that the joist hangers are then attached to) using this type of style of bolt :
Last edited:
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Yes that looks fine.
I suppose the joist hangers youve chosen are heavier duty than you need, but they do hold the joists firmly in place.

Use the proper 30mm x 3.75mm twist joist hanger nails -screwfix do them.

Dont use screws.

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