HOW TO build an igloo in your backyard ⛄️ Materials: •snow and water •food colouring •lasagne trays or plastic containers •watering can •large plastic tub for mixing the sludge You will need temps of at least -7°C or below. The colder the better. Make the ice bricks using water and food colouring in lasagne trays or plastic containers. We bought 40 lasagne trays and froze about 180-200 bricks. To stick the bricks together use a mixture of snow and water and spray with the watering can to seal an