For Commercial and Multi-Family Permits
For commercial or multi-family project, the structural calculations should include gravity design and lateral design of the building. Gravity design includes structural design of roof and floor framing, bearing walls, columns and foundations. Lateral design must address both wind and seismic loads including design of the main lateral force resisting system, components and cladding, diaphragms and foundations. Buildings 5 stories or more are required to be designed by a licensed structural engineer.
Modifications of existing buildings or structures often require engineering design. The International Existing Code (IEBC) specifies the structural requirements for buildings undergoing repairs, alterations, change of use, and additions.
Modifications of existing buildings or structures often require engineering design. The International Existing Code (IEBC) specifies the structural requirements for buildings undergoing repairs, alterations, change of use, and additions.
For Single-Family Permits
Where a building of otherwise conventional construction contains structural elements exceeding the limits of the International Residential (IRC) Code section R301, or otherwise does not conform with the IRC, those elements must be designed in accordance with accepted engineering practice (IRC R301.1.3). Supporting structural calculations will be required for any such elements. Common elements requiring engineering include (but are not limited to): retaining walls greater than 4ft in height from the bottom of the footing, basement walls, decks, beams and headers, roof or floor trusses and shear walls.