Seismic Roof Curb Requirements

Curb adapters retro mate.

Seismic roof curb requirements.

For installation on flat membrane built up roofs requiring seismic rating. Equipment mounting supports. 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. The york curb uses only un treated wood.

It is suitable for units in the 5 000 lb to 12 000 lb 40 ft long class for most seismic and wind conditions. Non insulated roof curbs. Additionally seismic requirements are not fulfilled by just ordering a seismically stamped roof curb. Seismic curbs are manufactured by thycurb fabricating division of thybar corporation or approved equal.

The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. 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. 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. Meets seismic code requirements.

Furnish and install prefabricated seismic roof curbs as required to meet seismic requirements. 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. 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. Catwalk service platforms.

Curbs solidly braced or bolted directly to the building structure without vibration isolation. As the sizes increase beyond 12 000 lb and 40 ft of length attachment to a sheet metal roof curb becomes impractical. The goal is to match or exceed the seismic roof curb design value referred to as the ss value. All welds coated after fabrication.

16 gauge galvanized steel. 1 3 density fiberglass as required fully welded mitered corners. Icc es ac 156. For these applications esr s andmegacurb s are required.

Roof curbs insulated roof curbs. 07 72 00 thy buyline 3055.