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.
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Following a series of heavy snow and wind events in February of 2015, a FEMA team assessed four partial school building collapses in the Greater Boston area. In all four cases, the partial collapses were due to roof snowdrift loading. In two of the four cases, the FEMA team observed and documented 3-D drifts that cannot be determined when following the current ASCE 7 minimum load requirements.
This new design guide provides guidance, in the form of three design examples, for three-dimensional (3-D) roof snowdrifts. The procedures identified are consistent with the intersecting drift provisions expected in the 2022 edition of ASCE 7 and are intended to serve as best practice guidance for design professionals in the interim.