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Rtu roof curb detail.
When a building is constructed prior to the installation of the hvac rooftop unit rtu the roof is cut and a metal structure called a roof curb is installed.
In no case should the curb be less than 14 inches in height.
Through a comprehensive approach combining attention to detail with a constant flow of information rcs provides the most innovative and complete roof curb systems in the industry.
Top of all roof curbs shall be level with pitch built into curb when deck slopes.
Pressure treated nailers should be provided by the curb manufacturer to receive roofing felts and eliminate noise transfer.
The roof curb is designed to support the weight of the unit and to offer a means for contractors to connect the supply return air duct work.
The curb should provide a minimum clearance of 10 inches between the top of the finished roof surface and the top of the wood nailer continuous around the curb perimeter.
Curbs should be a minimum of eight inches above the finished roof and factory insulated to reduce condensation.
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.
Curb installation should be a part of the roof deck not on top of insulation or roofing materials.
See figure 6 6.
Pressure treated nailers should be provided by the curb manufacturer to receive roofing felts and eliminate noise transfer.
Curbs should be a minimum of eight inches above the finished roof and factory insulated to reduce condensation.
Heights to be 8 above finished roof deck or as detailed.
Internally insulated with 1 1 2 thick 3 lbs.
As a general rule the curb should be placed directly on the roof support members.
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Typical roof curbs the curb should be structurally capable of supporting intended loads and designed such that drains power lines etc do not penetrate roof fl ashing.
The curb should be furnished with a wood nailer which provides a minimum of 3 5 of nailer surface mounted at the top of the curb to permit mechanical attachment of.
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.
Installer s guide roof curb packaged rooftop units.
Curb installation should be a part of the roof deck not on top of insulation or roofing materials.
