Seismic Roof Curb Requirements

Curb adapters retro mate.

Seismic roof curb requirements.

Curbs solidly braced or bolted directly to the building structure without vibration isolation. All welds coated after fabrication. The goal is to match or exceed the seismic roof curb design value referred to as the ss value. It is suitable for units in the 5 000 lb to 12 000 lb 40 ft long class for most seismic and wind conditions.

For installation on flat membrane built up roofs requiring seismic rating. Roof curbs insulated roof curbs. Base shall be constructed complete with all welded corners and wood nailers. Catwalk service platforms.

Equipment mounting supports. For these applications esr s andmegacurb s are required. Additionally seismic requirements are not fulfilled by just ordering a seismically stamped roof curb. Any roof curb rigid or vibration that have been engineered and stamped to meet current ibc 2015 you may also hear this as complying or calculated.

Non insulated roof curbs. The curb should provide a minimum clearance of 10 inches between the top of the fi nished roof surface and the top of the wood nailer continuous around the curb. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures. Icc es ac 156.

07 72 00 thy buyline 3055. 1 3 density fiberglass as required fully welded mitered corners. As the sizes increase beyond 12 000 lb and 40 ft of length attachment to a sheet metal roof curb becomes impractical. Ss is the mapped maximum credible earthquake five percent dampened spectral response acceleration parameter at short periods as defined in asce 7 10 section 11 4 1.

The additional requirements are detailed on each stamped submittal drawing. Flange screwed to 15 32 osb roof deck 8 2 7 24 x 24 curb with exhaust fan fan screwed to curb 2 5 8 36 x 36 curb with exhaust fan fan screwed to curb 3 3 9 5 9 x 3 8 curb with 2 8 high hvac unit hvac unit screwed to curb 4 5 10 5 9 x 3 8 curb with 2 8 high relief air hood hood screwed to curb 35 6. Furnish and install prefabricated seismic roof curbs as required to meet seismic requirements. The york curb uses only un treated wood.

Additional roof curb anchoring and methods of securing equipment to the curb are also a requirement and must be adhered to for the certification to be valid. Seismic curbs are manufactured by thycurb fabricating division of thybar corporation or approved equal.