Maybe not heavy duty but is it worth buying a mesh 3.0M from China if you intend using it on Ku, may as well get a 2.4 solid? A 3m (120") mesh such as the KTI only has 1dB extra gain over a 2.4m spun dish like the Precision/Irte/Primesat, I'm not sure I'd trust any figures from a Chinese wholesaler. You then need to factor in the considerable wind loading a 3m dish will have on a shed roof, hope it's not yer average garden centre wooden one?