Watch us install a Klip Lok Roof and transform this balcony into a functional room The roof sheets are fixed together with concealed clips fastened at the top of the purlins, allowing for a seamless and striking roof line that remains uninterrupted by screws. Installation is quick and affordable due to the low material cost, and suitable for Singapore weather as the roof allows for thermal movement at the clips. Seven layers of material are structured together to create sturdiness, which includes layers of bitumen felt, cement board, rockwool and aluminium.