Okay thanks, I’d come across some locally left over from a job and just crossed my mind, have this extension we did and now converting garage which has been extended and got a temporary roof, it’s 12.5 degrees I can’t go higher, want to do that bit first as it’s business workshop currently in main garage, extension is Marley moderns, there will be a box gutter joining the two of them, south facing and Oxfordshire so not extreme weather area (yet!) had hoped for a flat matching style but looking like pitch is the issue, prefer tiles as can see roof from extension and would look nicer, photos from rear bedroom, joists are in 150mm, 400 centres with every 4th having another between it and the following one for added strength and might have solar panels later. Any smooth flat options without costing a fortune or are redlands better than mendip 12.5's ? (Also noticed some huge leadtimes on tiles!) I could board, felt and counter batten then tile but adds weight, cost, time and height and none of those appeal strongly. I had contemplated winging it with some moderns and seeing if they leaked at the pitch but risky strategy being a workshop with expensive kit in