Roof Curb Extension Installation

The curb opening is measured from the inside edge of flange.

Roof curb extension installation.

The curb should be installed to the roof and or wall using appropriate type and size fastener depending on roof and or wall material. Curbs should be a minimum of eight inches above the finished roof and factory insulated to reduce condensation. Extension height based on use of 8 high curb. A wide variety of roof curbs are available including.

As a general rule the curb should be placed directly on the roof support members. For use with model vrbk restaurant exhaust fan and standard roof curb vrbk curb cap curb ext. A wide variety of roof curbs are available including. Flanged straight sided canted pitched ridged vented and sound absorbing.

Roof curbs are in many cases installed on the roof and temporarily covered over for waterproofing purposes much earlier than the construction schedule requires. Check all fasteners for tightness. In this case additional. Roof curbs allow the installation of the primary roof and the flashings around this roof curb prior to the delivery of the actual roof equipment and the setting of this equipment.

Use tack welding or other suitable fastening method to secure the roof curb in place. Pressure treated nailers should be provided by the curb manufacturer to receive roofing felts and eliminate noise transfer. The curb can also be mounted on a roof deck. Make sure that the duct connection and fan inlet are properly aligned and sealed.

The upslope and downslope edge of the roof opening must be located at least six inches from the centerline of the roof panel attaching clips to allow for roof expansion and contraction. However when using lanyards ensure that the clasp belt hooks and wire cables are covered in such a manner that they will not scratch the panel surface if accidentally dragged along the panel. Shims may be required depending upon curb installation and roofing material. Curbs should be a minimum of eight inches above the finished roof and factory insulated to reduce condensation.

Ht 06 15 1 2 14 15 12 18. Curb installation should be a part of the roof deck not on top of insulation or roofing materials. 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. Curb and roof opening.

Flanged straight sided canted pitched ridged vented and sound absorbing. Extension height selected to allow 18 welded duct height and maintain 40 discharge height required per nfpa 96. Extensions raise the fan discharge and can provide an accessible mounting location for dampers. The fan base is secured to the curb using a minimum of 8 appropriately sized galvanized self drilling screws.

Pressure treated nailers should be provided by the curb manufacturer to receive roofing felts and eliminate noise transfer. Roof curbs extensionspage header and equipment supports prefabricated roof curbs reduce installation time and costs by ensuring compatibility between the fan curb and roof opening.