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- 6 Jan 2006
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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!!