Mounting on top of insulation

[moggy1968]

I think thats one I wouldn't even quote on!! too much hassle!

 

[hermetic]

Sorry yellowvanman, should have said metal conduit, but screwdrivrs SS would be even better, conduit is in compression, so not a problem.

 

[jerriais]

This sounds like a SIPS construction (Structural Insulated Panel System). As you can see from the name the panel not only provides insulation but also has enough strength to form part of the structure. Very difficult to install on but if you can find the rafters with an accurate stud finder tool (we use on from Hilti) then you can use specialist screws from Ejot or similar to go through the SIPS panel and into the rafter.

 

[pembrokeshire]

6 Inch Nails !!!
Usually there is 3/4 osb on top then cross battens, so plenty of grip if you predrill your fastenings. Something we will see more of I expect
Mark