SupraTile has very strong tight interlocking teeth even though they are not waterproof they are water resistant and good for normal garage use. SupraTiles are used in Firehouses and other indoor applications where there is substantial water usage.
If you are looking for a 100% watertight solution we would recommend 2 options:
1. ArmorCover roll-out mat. ArmorCover is PVC Rubber Flooring that simply rolls out. There is no adhesive necessary. It’s easy to install, easy to maintain and easy to clean. ArmorCover PVC Rubber Flooring comes in many colors and textures to give your project a custom look with little prep time and at an affordable price.
2. ArmorPoxy carries a special adhesive that makes the floor waterproof to the point that if any water did get through a joint, it would have nowhere to go since the adhesive acts as a 'dam' to prevent the migration. This is what we recommend in firehouses.
Contact our support team to learn more about these options.