--- title: "FEMA Storm Shelter Standards & Testing | Sheltris" url: https://sheltris.com/resources/standards-testing description: "Understand FEMA P-361, ICC 500, and Texas Tech testing for storm shelters. Learn what testing means and how to verify a manufacturer's claims." lang: en --- Underground Storm Shelters — Lubbock & West Texas (806) 241-8862 (+18062418862) # Storm Shelter Standards and Testing What they mean, why they matter, and how to verify a manufacturer's claims. Storm shelters are life-safety products. The difference between a shelter that works and one that doesn't can be measured in PSI, in wind speed ratings, and in whether an independent body has verified the manufacturer's claims. Here's how to read the credentials. Federal Guidance ## FEMA P-361 FEMA P-361 — Safe Rooms for Tornadoes and Hurricanes — is published by the Federal Emergency Management Agency. It provides detailed design and construction guidance for storm shelters, including structural requirements for resistance to 250 mph winds and representative debris impact. FEMA does not certify, approve, or endorse specific shelter products. When a manufacturer says their shelter is "FEMA compliant," they mean it was designed to meet the guidelines in P-361. There is no FEMA seal of approval. This distinction matters. Some companies use phrases like "FEMA-rated" or "FEMA-approved" to imply official endorsement that doesn't exist. Accuracy in language reflects accuracy in engineering. Building Code ## ICC 500 ICC 500 is the International Code Council's standard for storm shelter design and construction. Unlike FEMA P-361 (which is guidance), ICC 500 is a code-referenced standard — meaning it can be adopted into local building codes and enforced by inspectors. The City of Lubbock has adopted ICC 500. When you obtain your building permit for a shelter installation, the city inspector checks compliance with this standard. That's not optional — it's the law. Lubbock permit process: https://sheltris.com/installation/permits/texas/lubbock Testing Lab ## Texas Tech University Wind Science & Engineering Texas Tech's National Wind Institute conducts destructive testing of building components and storm shelters. Their testing simulates tornado conditions — including wind loads and high-velocity debris impact — under controlled conditions. Protocol 4 — the tornado test criterion — uses a 15 lb. wood 2×4 propelled at 100 mph for horizontal impacts and 67 mph for vertical impacts, simulating a 250 mph tornado. The missile may penetrate but cannot perforate the safe side of the shelter. Permanent deflection must remain under 3 inches. Our shelters are manufactured using designs that have been tested at the Texas Tech Wind Science & Engineering Center. Texas Tech does not certify commercial products. They conduct independent testing and report results. We do not claim certification — we claim verified testing. Download TTU Test Protocols (PDF): https://sheltris.com/documents/ttu-test-protocols.pdf ## How to Verify a Manufacturer's Claims Before you buy any storm shelter, ask these questions: - 1 Ask if the manufacturer's shelter design has been independently tested and verified - 2 Ask for a copy of the test report (test number, date, lab) - 3 Ask if your installation will be permitted with the city - 4 Ask who performs the installation — the manufacturer's crew or a subcontractor - 5 Ask for the warranty in writing before you pay We believe every shelter buyer should demand this level of verification. We hold ourselves to the same standard. See our shelter specifications: https://sheltris.com/storm-shelters/residential/below-ground View our credentials: https://sheltris.com/about ## Frequently Asked Questions What does FEMA compliant mean for storm shelters? It means the shelter was designed to meet the guidelines in FEMA P-361, which requires resistance to 250 mph winds and debris impact. FEMA itself does not certify or endorse specific products. Are all storm shelters tested? No. Testing is voluntary. Some manufacturers claim compliance without third-party verification. That's why independent test reports and verifiable credentials matter. ## Have questions? Talk to our team. Get Your Free Quote (https://sheltris.com/get-quote) ## Related Resources ### Underground Shelters See the shelter specs that meet these standards. Read more https://sheltris.com/storm-shelters/residential/below-ground ### About Sheltris Our credentials, our values, and transparent status. Read more https://sheltris.com/about ### Lubbock Permits How ICC 500 is enforced through the Lubbock permit process. Read more https://sheltris.com/installation/permits/texas/lubbock ### Above vs. Below Ground How both shelter types meet the same FEMA standard. Read more https://sheltris.com/resources/above-ground-vs-below-ground ### Safe Rooms vs. Shelters Both meet P-361 — here's how they differ. Read more https://sheltris.com/storm-shelters/safe-rooms ### FAQ Common questions about standards, testing, and compliance. 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