Wall plate length.

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HammerHappy

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Hello. I am building a single story extension with a flat roof at the back of our bungalow. The roof joists will be hung on joist hangers on timber bolted to the existing house wall and resting on the timber wall plate at the other end. I am now ready to put the 4x2 timber wall plate on the inner skin of the block built cavity wall. My question is does the wall plate extend over the inner skin, cavity and outer skin at both ends so that the end roof joists have got a good solid fixing and are level with the rest of the joists? Obviously doing this means the ends of the wall plate would be visible (open to the elements) from the outside, so to overcome this i would need a wider fascia to keep it covered. The other alternative is to just take the wall plate over the first skin and make the roof size up with noggins but i don't feel that the roof would be strong enough this way. Hope i have explained this well enough for somebody to help me. Thanks in advance for any help!!
 
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Edit.(I missed the flat roof bit).

Normally you would have it to the inside edge of the inner skin so the gable walls can be built up and use a gable ladder to span over the two skins to fix your soffit/facia.
 
The wall plate sits on top of your internal skin of blockwork - you can either extend your joists out and have a deep fascia or, rest them on the inner skin and build the outer skin of face work up under the roof covering, giving the opportunity for a smaller fascia. Either is fine.
 
Purlins, wall plates, pole plates etc usually stop at the inner skin, then (as said) a gable ladder attached to the last rafter and resting on the masonry, is used to carry the barge board etc.
 
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It does depend.

Fitting a plate makes holding down strapping simpler. Twisted straps are fiddlier and the twist bit is a pain.
 
A flat roof is just effectively a first floor, are they fitted with plates?

Level the top course, and strap the roof down, and that's it
 
Thanks for all your help. BCO wants a wall plate fitted. So sounds like the right way to do it would be to stop the wall plate at the inner skin and make up the roof size by making and adding on a gable ladder which rests across both skins.
 
I'm glad they used a wall plate on the extension on my house. It made it a lot easier to put a pitched roof over the top.
 
noseall said:
stuart45 said:
I'm glad they used a wall plate on the extension on my house. It made it a lot easier to put a pitched roof over the top.
Click to expand...
Yeah, but as Woodflops pointed out, this is a flatty.
Click to expand...
Mine was originally a flat roof. When I extended the extension, I put a pitched slate roof over the lot. I just cut a strip off the deck and cut the rafters in.
 
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