SilGuard Drainable Threshold will minimize water leakage inside buildings caused by rain or hosing down doors or entryways. Our unique, patented design drains water away from preventing water from coming inside the building. The First and Only ADA Compliant Drainable Commercial Threshold! The SilGuard Drainable Threshold is an ADA compliant device that offers a solution to water intrusion into commercial buildings. With pricing starting at $50 per linear foot and an exceptional drainage rate of a minimum of 2 gallons per minute, there is no easier way to ensure the safety and integrity of your building. There is no easier way to ensure the safety and integrity of your building. Whether you are construction a new build or are looking for a way to retrofit an existing building with a newly designed option for water drainage, SilGuard Drainable Threshold is your ideal choice.