wall plate size question

[nottsrob184]

Hi all.
I am just finishing the brickwork for a rear single storey extension.
I will be starting the lean to tile roof construction this week hopefully.
I want to know what size the wooden wall plate should be that sits on the inner block wall that suports the roof rafters.
I am struggling for roof angle (15 degrees) so wondered if 25mm thickness is Ok or if it has to be thicker.

Thanks

 

[themiddleagedun]

I'd say 100x50mm is the minimum size to get a decent fix for your rafters.
If you birdsmouth the rafters you'll increase the pitch slightly.

 

[noseall]

I concur with Middleagedfella, 25mm will be practically useless and prone to splitting. You need a bit of meat when fixing joists and rafters so close together.

 

[nottsrob184]

I'd say 100x50mm is the minimum size to get a decent fix for your rafters.
If you birdsmouth the rafters you'll increase the pitch slightly.

Sorry to ask...but what is "birds mouthing the rafters"???
Thanks

 

[^woody^]

 

[noseall]

Look here.