This house has a lean-to conservatory roofed with corrugated plastic. The roof has been there since we moved in and is coming to the end of its life. I'm looking to replace it when we have the guttering above replaced. The wooden cross-supports are perpendicular to the house wall and at irregular intervals (67,62,61,62,61,65,57,58,22cm centre-to-centre). Reading C&A Supplies site suggests to me that the cross-supports should be at regular 1m intervals and to my reading that the roofing is screwed down through the glazing bars.
Just to confuse me further, one of the guys we had come to quote for the guttering told me that the supports should have been placed parallel to the wall and suggested I put battens across the existing supports.
What do the panel suggest? And what would you suggest is the most sensible compromise between cost and 'u' value etc.
tia,