One day when we had a lot of snow I went out per usual to use the sauna. Eventually what happened was all the snow melted and then turned to ice collapsing the top. Not breaking it, just folding it within itself. If anyone ever has had this happen this is the perfect $40 remedy. Measure and cut to your specs and it can go right on the plastic hockey puck dead center of the roof and won’t budge ( as long as you measure right )