I HAVE HAD ROOF WINDOWS ISTALLED IN THE LOFT AND HAVING BC COME TO INSPECT HAVE ASKED FOR DOUBLING UP OF THE RAFTERS. THAT IS ALL FINE BUT WITH THE PURLIN IN THE WAY I WOULD NOT BE ABLE TO FIX FULL LENGTH OF THE DOUBLE UNLESS IN 2 OR 3 SECTIONS. WOULD THIS BE ACCEPTABLE? ALSO MY PURLINS WOULD NEED STRENGTHENING. HOW COULD THEY BE STREGTHENED?? IF ANY CAN GIVE ADVICE ON HOW TO ACHIEVE THIS I WOULD BE SO GRATEFUL. I AM ON A LIMITED BUDGET AND IN DIRE STRAITS HERE. AM SICK OF THIS LOFT CONVERSION..HAVE BEEN STUNG BY ROGUE TRADERS WHO FITTED ROOF WINDOWS ETC. ANYONE PLEASE HELP!!!