Profile: Strong Life Roofing Solutions offers guttering & downpipes, iron roofing, tile restorations and roller shutters. Our square line gutter is ideal for garages. Square-line gutter is a square front gutter that is slotted & needs to be folded around corners, eliminating the use of external angles, and is fixed with concealed brackets. Our roller shutters contain thermal insulation properties; which means they will significantly protect against heat and cold.