Hi Allan, why has the desighn not got water as your weight in stead of tube, the last tempory roof we did we filled up water buts with water. And had them on every standard right round the building.We were in one of the most exspossed areas down our way near Lands.We had some megga storm's. And as long as the desighn has colculated the weight distrubution right. You would be on here moaning about how long it took to fill the barrels up though borring for o ne of the lads who stood there on the phone all day, It saved on loading out a load more tube than what was first put on the drawing.. Change your scaffold desighner or tell him about the access issues. Water in drums mate its the only way with bad access.