Wall plates and Expansion Joints

[racingtadpole]

Have to put a 190x45 Wall plate on a masonry wall to support rafters for a pergola. Wall plate is around 13m in length. Wall has several windows that have control joints on both sides (house is on a marginal strip footing on super reactive clay). Wall plate is to be attached with Hilti chem anchor gear. Right thats the background out of the way.

Cut the timber at the controls or bridge them?

Thanks for the input.

[intertd6]

slot your holes in the timber plate so the wall can move independant to the roof structure.
regards inter

[racingtadpole]

If the bolts are tightened properly the timber will be held captive, effectively rendering the control joint non existant, or am I missing something?

The amount of work that generates is quite mind numbing... Engineering says 400mm centres for the chem anchors, so over 13m thats 30 odd holes to slot. :no:

[Bloss]

Just cut the ledger at each control joint and make sure that you place the fixings appropriately in from each end.

[intertd6]

If the bolts are tightened properly they will allow lateral movement, 2 or 3 contiguous bored holes in a row then the slot cleaned up with a chisel is no big deal. Allowing for movement in differing materials is part of the knowledge needed for good building practice, but seeing its just a pergola some would just cut the top plate at the exp' joints then the movement would be transfered into the roof framing, after all there will be no plasterboard ceiling to worry about cracking or popping joints.
regards inter

[Bloss]

If the bolts are tightened properly they will allow lateral movement, 2 or 3 contiguous bored holes in a row then the slot cleaned up with a chisel is no big deal. Allowing for movement in differing materials is part of the knowledge needed for good building practice, but seeing its just a pergola some would just cut the top plate at the exp' joints then the movement would be transfered into the roof framing, after all there will be no plasterboard ceiling to worry about cracking or popping joints.
regards inter

:whs: which is why I said what I said . . . :cool:

[intertd6]

:whs: which is why I said what I said . . . :cool:
If you look at the posting time of our replies & the matter of my horribly slow typing you will see what has happened.
regards inter

[Bloss]

Wasn't having a go - I get caught out like that all the time. Only so fast ya can go with two fingers . . . which is all I can do :-

[Uncle Bob]

Only so fast ya can go with two fingers . . . which is all I can do :-

Hehe, that's called hunt and peck. I'm an IT professional (well depends who you ask ;) ) and am still a terrible typist.