Specify prefabricated roof curbs and related products by a roof curb manufacturer (not with, or by, the equipment manufacturer).  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.  All roof curbs, equipment rails, pipe and duct mounting pedestals, and pipe penetration systems to be specified together, bought by one contractor, and installed by one contractor.  All curbs to be provided by one roof curb manufacturer. Fully welded and assembled • saves installation time and money • no chance of missing parts • no field assembly requiredFactory GREENGUARD insulated • alleviates the coordination problem of providing insulation for roof curbs by either the mechanical contractor or the roofer. This problem is rarely addressed and roof curbs go uninsulated causing condensation problems.

Pitched to match roof configuration • allows equipment to stay level • saves installation time and money by eliminating shimming • provides uniform loading surface unlike shimmed curbs which rely on point loadingDesigned to meet roofing system proper curb style matches roof system and eliminates leak situations • eliminates costs by preventing roofer from having to alter curb to meet design requirementsAll roof curbs delivered at the same time • eliminates any delay in project • all curbs mounted at one timeSingle source responsibility • one contractor to co-ordinate and install all curbs One specification required • saves time and money • eliminates confusion in tradesCurb uniformity • all curbs same style, height, and proper pitch Dollar savings • reduce multiple markups • helps keep projects within budget Roofcurbs are simply the mounting frame that a commercial HVAC unit rests on when being installed on a rooftop. MicroMetl manufactures ten of thousands of curbs each year including standardized curbs, taller, shorter, pitched and calculated for seismic conditions.

Adjustable pitched curbs, vibration isolation curbs and curb adaptors are also available. All curbs are constructed of high quality galvanized steel and many use the innovative tongue-and groove MicroLok design, which requires no tools and assembles much faster than the competition's product. Curbs typically include the wood nailer for roofing, gasketing to provide a seal to the HVAC unit, and duct supports and insulated deck pans, as required. Curbs are typically shipped knocked down but assembled curbs are available. Knockdown Curb – This curb ships unassembled, and can be easily stored in your inventory. It’s an inexpensive option, and with the use of some basic tools, it’s very easy to field assemble! Welded Curb – This curb saves time in the field since it ships fully assembled, but the welded construction is more expensive to ship, and some times requires a crane to get it onto the roof, and into place. Adjustable Pitch – The MicroMetl Adjustable Pitch Curb is designed to pitch up to one in twelve inches in either direction.

The adjustable pitch curb ships knockdown, is less expensive than a fixed pitch welded curb, and allows job-site flexibility. Platform Curb – This curb type has an insulated metal covering, standard wood nailer, and is intended to support horizontal rooftop units, split system condenser sections, or similar type items. It can be roofed in, or fastened to a concrete slab. Horizontal Curbs – It accepts a down discharge RTU, and redirects the air flow out the side(s), or end(s) of the curb, converting it into a horizontal application.problems with hvac unit Structurally Calculated Curbs – There will be times when the building code will call for a calculated, or seismic rated roof curb that is approved and stamped by a Professional Engineer. air handling unit space requirementsThese requirements are often based upon the California Building Code, and International Building Code.standing water in ac unit

Vibration Isolation Curbs – The Isolation Curbs contain strong steel springs with a two inch deflection. They are designed and engineered to control noise and vibration of packaged, curb-mounted mechanical equipment from the roof structure. The Wind Curb – Built to secure the rooftop unit to the curb in high wind conditions. They gained recognition following the devastation of South Florida from Hurricane Andrew. The wind curb is PE Stamped and requires field anchoring. Vibro-Curb III ™ incorporate adjustable spring isolators and can ship as a single piece unit. RTU can be mounted immediately after the Vibro-Curb III ™ is installed and roofing can be completed at a later date without disturbing the RTU. This process will reduce installation costs and expedites the installation process. Flexible counter flashing provides a weather tight seal and easy access to the isolation springs. Isolators are sized and spaced to accommodate the rooftop weight and center of gravity for a minimum of 90% isolation efficiency.

1”, 2”, and 3” spring deflection available provided with 2” x 4” wood nailing strips and an 9” continuous rubber counter flashing. Counter flashing insures water tight seal. Prime G-90 galvanized steel 14 to 18 gauge Fully welded and mitered corners Base flange attachments for securing equipment mounting supports to the building structure Acoustically non-conductive material minimizes sound transitions Vertical limit stops eliminates excess movement Reinforced with internally bulkheads Prefabricated Vibration isolation curb to be manufactured of prime galvanized steel construction, 18 or 14 gauge as required, meeting ASTM A653/653M, with welded corners and with seams joined by continuous water and air tight welds. Vibration isolation curb shall be internally reinforced with bulkheads 48” on center and factory installed wood nailer. Top of all Vibration isolation curb shall be level, with pitch built into curb when deck slopes.