WATER-STOP HEAVY DUTY SHOWER TRAY is the highest density shower tray, hard enough to receive any tile size and support weights over 3,000kg. It is produced by a new technique which allows it to include a bigger waterproofing membrane. The difference on sizes creates a waterproofing flange which improves the waterproofing and reduces times and materials needed. This product is available in different sizes and layouts, although if a special size is needed, it can be cut with a utility knife.