Hello, we're sorry for your experience, but this product is not designed to be a temporary roof or left as a "dry-in" solution. This limitation is specifically noted in the detailed installation instructions on each roll wrapper. It is meant as a secondary layer of protection under the final roof covering - asphalt shingles. If you're looking for a "water proof" solution, a peel and stick underlayment that has the ability to self-seal around the fasteners is the best solution. When you fasten through most synthetic underlayments they do not have the ability to self-seal around the fasteners and thus when left exposed to heavy rainfall, water can infiltrate at those points. In addition, the product itself, without fasteners, is tested per ASTM D4869 4 hour shower testing to ensure that water simply doesn't penetrate through the product. Thank you.