Maintaining Infill levels are important in keeping synthetic turf secure, stable, and flat to the planular surface that is created. Infill is used to “weight-down” the turf to prevent movement. When synthetic turf is lacking specified amounts of Infill, expansion and contraction will occur. When extreme heat is present, synthetic turf that is “Infill deficient” will lift and pull from weakest point/areas. Theses weak point/areas that lift, create wrinkles. The volume of “Infill deficiency” will determine the amount, size, and length of the wrinkles.
During Installation when the temperatures are cooler the wrinkles are less to appear. When the temperature rises, the heat transfers within the turf and causes the backing to swell and lift from the ground. Some synthetic turf when wrinkled is stronger than the 2lbs. of infill you are trying to use to flatten it. I recommend purchasing an Infill “Depth Meter” to ensure your Infill depths are at proper levels.