Mechanical Roof Curb Detail

Caution should be used when considering the use of.

Mechanical roof curb detail.

Instructions supplied with the unit curb. Roof curb and curb adapter specialists serving north america. Specify roof curbs in section 07720. Include a footnote in the mechanical and skylight sections that reads all roof curbs are specified in 07720 curb installation should be a part of the roof deck not on top of insulation or roofing materials.

Use tack welding or other suitable fastening. Roof curbs for standing seam metal roofs pick the proper material. Mechanical contractors should not be asked to supply or install roof curbs for roo fi ng systems. Lmcurbs has the capabilities to design roof curbs for the most challenging standing seam roof applications and can correctly match your roof system.

Specify prefab roof curbs for use with all roof penetrations and roof mounted equipment including and not limited to hvac units duct openings pipe penetrations power roof exhauster intake and relief vents flues or job fabricated items. Heights to be 8 above finished roof deck or as detailed. When you install adapter curbs welded rtu rooftop unit curbs or equipment supports for your rooftop hvac package unit going with the wrong curb adapter company can cost you big money and time. Specify prefabricated roof curbs and related products by a roof curb manufacturer not with or by the equipment manufacturer.

The curb should be furnished with a wood nailer which provides a minimum of 3 inches of nailing surface mounted at the top of the curb to permit mechanical attachment of the flashing material. Roof curb shall be internally reinforced with angles 48 on center and factory installed wood nailer. If the roof curb will be mounted on a new building it can be assembled at any convenient location and installed as soon as the roof support members are in place. A galvalume coated roof doesn t mean that a galvanized steel roof curb is the best thing to use in fact galvanized roof curbs are known to rust corrode and leak particularly along weld joints as soon as a year after installation.

Allowing the highs to fit under the roof panel on the upslope and over the roof panel on the downslope to create a continuous water flow is critical to the function of the roof curb. As a general rule the curb should be placed directly on the roof support members. Become familiar with the roof curb installation procedures. Roof curbs should be supplied by the hvac manufac turer to the general contractor or building manufacturer and installed by an experienced erector.

This guide does not address roof penetrations. Top of all roof curbs shall be level with pitch built into curb when deck slopes. Lines etc will occur through the roof flashing.