FLOOD00910

• County: Statewide
• Community: Statewide
• Stream Name: All
• Title: Elevation of Floodprone Residential Buildings
• Date: 1/1/1995
• Prepared For: State of Colorado
• Prepared By: FEMA
• Floodplain - Doc Type: Educational/Technical/Reference Information

Chapter VI: General Design Practices
Elevation

Roofs: The plywood roof diaphragm, trusses, connections,
and uplift on roof sheathing should be capable of resisting
the increased wind and seismic loads, The American Plywood
Association has published several references that are useful
in this calculation. These include:

. Roof Sheathing Fastening Schedules for Wind Uplift;

. Diaphragms; and

. Residential and Commercial,

These reference materials or the local building codes will
give the designer the necessary plywood thicknesses and
connection specifications to resist the expected loadings,
and/or will provide loading ratings for specific material
types and sizes.

If the roof diaphragm and sheathing are not sufficient to
resist the increased loading, the design can strengthen these
components through the following:

. increase the thickness of the materials, and/or

. strengthen the connections with additional plates and
additional fasteners.

Roof Truss to Wall Connections: The roof trusses and
truss connections to walls should be checked to ensure that
they will resist the increased wind loads. Of critical impor-
tance are the gable ends, where many wind failures occur.
The American Plywood Association has published several
references that are useful in this calculation. These include:

. Panel Handbook and Grade Glossary, and

. Residential and Commercial.

VI - E.38

Engineering Principles and Practices of Retrofitting Flood-Prone Residential Structures
January 1995