Building Science Resource Library
The Building Science Resource Library contains all of FEMA’s hazard-specific guidance that focuses on creating hazard-resistant communities.
You can search for a document by its title, or filter the collection to browse by:
- Topic: High winds, flood, earthquake, etc.
- Document Type: Brochure, report, fact sheet, infographic, etc.
- Audience: Building professionals & engineers, individuals & homeowners, teachers & kids, etc.
Sign up for the building science newsletter to stay up to date on new resources, events and more. Don't forget to confirm your subscription in the follow-up email.
Developed in response to Hurricane Ida in Louisiana, the purpose of this guide is to provide guidance on how to improve the wind resistance of existing one- and two-family dwellings in hurricane-prone regions of the United States and its territories. This guide is not applicable to manufactured housing (MH) units or townhouse units.
This sixth edition of FEMA P-320 presents updated and refined criteria for residential safe rooms through reference to the newly updated fifth edition of FEMA P-361, Safe Rooms for Tornadoes and Hurricanes: Guidance for Community and Residential Safe Rooms (FEMA, 2024d). FEMA P-320 draws on these updated criteria to address how to design and construct a safe room for a one- or two-family dwelling that provides near-absolute protection from wind and wind-borne debris for occupants. It should be noted that the updates in this edition of FEMA P-320 focus guidance exclusively on residential safe rooms for one- and two-family dwellings. Prescriptive safe room designs that meet FEMA criteria for one- and two-family dwellings are also included as a part of this publication. The 2024 editions of this publication and FEMA P-361 supersede FEMA’s National Performance Criteria for Tornado Shelters (FEMA, 1999) as well as earlier versions of FEMA P-320.
This publication provides guidance from the FEMA about the planning, design, construction, and operation of safe rooms. It presents important information about the design and construction of residential and community safe rooms that will protect people during extreme-wind events such as tornadoes and hurricanes. This edition also features updated FEMA Funding Criteria for safe rooms and clarified guidance based on ICC 500-2023, Standard for the Design and Construction of Storm Shelters.
Residential safe rooms are becoming more popular as families seek protection from violent tornadoes. Like any other room, safe rooms must be accessed through an opening or door. Just as the walls and roof of a safe room are designed and built to protect against extreme winds and wind-borne debris, so must the safe room door. When careful selection and installation of the safe room door assembly is overlooked, the safe room door opening can leave occupants at great risk of injury or death during tornadoes. This fact sheet provides graphics and useful information about selecting adequate door assemblies for residential safe rooms.
Safe room door assemblies are one of the most important components of a safe room because they must provide the same level of protection as the walls and roof, yet also remain functional for quick access. This fact sheet provides information about the selection, installation, and maintenance of safe room door assemblies for community safe rooms. It is recommended that safe room door assembles are regularly maintained to protect their functionality and maximize their life span. The fact sheet covers what should be checked and how often, as well as several solutions related to the maintenance of safe room door assemblies. While the fact sheet discusses community safe room door assemblies, some of the information in the fact sheet is pertinent to owners of residential safe rooms.
The Playbook is intended for officials interested in increasing community resilience and reducing loss from natural hazards by adopting the latest editions of model building codes. The Playbook provides general steps to help navigate the code adoption process and informs about FEMA grants available to support building code adoption and enforcement activities.
Building Science training courses allow participants to gain access to expert insights, cutting-edge research, and practical tools to address complex challenges in building design, construction, and resilience.
This Recovery Advisory is intended for owners and operators of critical facilities; architects and engineers who design them; various state, local, tribal, and territorial planners; and emergency managers who deal with critical facilities whether in support of emergency preparedness, planning, response, and disaster recovery efforts or administration of mitigation grants and operations.
This Recovery Advisory provides important recommendations to reduce water intrusion through and around windows and doors due to wind-driven rain during extreme wind events.