Wall plate insulation detailing

[DIY-Dafydd]

Hello, 

 

I've been putting it off but it's time to detail the wall plate intersection of my studio/workshop and I thought it probably best to get it finalised before slating.

 

It's a 500mm rubble infill stone wall.

 

The roof insulation is 150mm PIR over the battens. 

 

The plan is to cast hempcrete internally, but I'm unsure as to how to join this to my roof AVCL and how best to fill the void between the top of my wall and the rafters. 

 

All ideas and input welcome! 

[Redbeard]

I always think of wall-plates as sitting on top of the masonry, but I assume you mean that 'low purlin' as the wall-plate? I cannot see what goes on below the wall-plate/purlin, but there appears to be light coming in -- ?? Assuming the roof continues down in an oversail then why not bring the hempcrete up and over the top of the wall and physically fix it to the back of the VCL? Ahhh.... because you cannot get in there to fix to it. I was thinking of a 50/50 mesh/air-tight tape 'combo', the mesh 'plastered in' to the hempcrete and the tape stuck to the membrane.

 

Goes off to think for the evening....