I have to get retrospective Building Control approval for a roof which has
had its slates replaced by heavier tiles. I understand I need to fit an
inverted 'A' frame which I want to do my self (to save £350+).
Whilst I understand how to make and fit the diagonals of the A frame, to the
I don't have any info on the 'collar', the horizontal beam/s of the A frame
link the two purlins) e.g.
- what diameter bolts?
- how many
- is it two beams or just one 4 * 2
- it is connected to the rafter?
Does anyone have a spec or drawing or could describe it or has photo?