Prefabricated Roof Curbs

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Author Message David Axt, AIA, CCS, CSI Senior Member Username: david_axt Post Number: 535 Registered: 03-2002 Posted on Tuesday, September 13, 2005 - 01:47 pm:    Do you guys specify premanufactured roof curbs or does the mechanical unit manufacturers supply the roof curbs? What do you do about skylight curbs? Ralph Liebing, RA, CSI Senior Member Username: rliebing Post Number: 218 Registered: 02-2003 Posted on Tuesday, September 13, 2005 - 02:04 pm:    We specify premanufactured curbs to be provided by the GC; roof-in by the roofer. Have manufacturer/supplier who provides, as their SOP, a coordinated roof plan showing all locations, sizes, details, etc. of all required curb units, incuding skylights. Trying to reduce responsibility to one firm. David Axt, AIA, CCS, CSI Senior Member Username: david_axt Post Number: 536 Registered: 03-2002 Posted on Tuesday, September 13, 2005 - 02:26 pm:    SOP? Ralph Liebing, RA, CSI Senior Member Username: rliebing Post Number: 219 Registered: 02-2003 Posted on Tuesday, September 13, 2005 - 02:28 pm:    Standard Operating Procedure Military term I learned during the Battle of Bull Run. David Axt, AIA, CCS, CSI Senior Member Username: david_axt Post Number: 537 Registered: 03-2002 Posted on Tuesday, September 13, 2005 - 02:34 pm:    --- -.- .- -.-- (Morse Code) John Bunzick, CCS, CCCA Senior Member Username: bunzick Post Number: 403 Registered: 03-2002 Posted on Tuesday, September 13, 2005 - 02:46 pm:    My experience is that the mechanical consultant specifies the roof curb and the mechanical subcontractor provides it, and it is usually made by the manufacturer of the equipment. I try to make sure that the mech. eng. specifies the type (with or without cant) that I want for the project. I've always figured that if the mechanical equipment manufacturer supplies the curbs, they're more likely to fit and function as necessary. Ralph Liebing, RA, CSI Senior Member Username: rliebing Post Number: 220 Registered: 02-2003 Posted on Tuesday, September 13, 2005 - 02:50 pm:    C'mon, David, I don't Morse, but the definition is for real. That is how the firm works for every project they do. Doug Brinley AIA CSI CDT CCS Senior Member Username: dbrinley Post Number: 112 Registered: 12-2002 Posted on Tuesday, September 13, 2005 - 03:53 pm:    We identify the different roof curb applications on each project. Then we assign all the curbs an opening number right on the drawings. Because we design industrial municipal facilities, we take pains to identify every penetration over 4 inches diameter. Yes, it's extreme. Then we review each application with the appropriate engineer. We note the substrate (metal roof; membrane roof; etc). And we note the structural system (concrete over metal deck; cold-formed metal girts on structural steel; etc.) Then we decide whether the curbs are custom; manufactured; a combination, etc. I'm usually surprised how many electrical penetrations there are - especially photovoltaics applications; lightning protection; gorundingand bonding; etc. David Axt, AIA, CCS, CSI Senior Member Username: david_axt Post Number: 538 Registered: 03-2002 Posted on Tuesday, September 13, 2005 - 04:39 pm:    Doug, That's a great idea! Now if I can only get the office to buy into it. I believe that by specifying a company that design/builds curbs would would save the contractor a lot of money and coordination headaches. If the contractor decides not to buy premanufactured curbs, we are still going to insist that the contractor submit shop drawings and engineering calcs. John Regener, AIA, CCS, CCCA, CSI, SCIP Senior Member Username: john_regener Post Number: 229 Registered: 04-2002 Posted on Wednesday, September 14, 2005 - 02:43 am:    Do you also specify which sub provides the fasteners and which sub is responsible for clean up of debris? Why not simply specify premanufactured metal curbs if that is what is desired? They would be suitable for skylights and piping supports, for example. For products with integral curbs, simply specify that the products shall have such curbs. Roof hatches and packaged air conditioning units commonly have integral curbs. Specifying subcontract scopes and trade jurisdictions is doing the Contractor's and the Construction Manager's jobs. It takes money out of the Architect/Engineer's pocket and puts it in someone else's. Let them earn the fee (profit) they make, which is greater than the entire fee of the architect/engineer. Brett M. Wilbur CSI, CDT, AIA Senior Member Username: brett Post Number: 64 Registered: 12-2004 Posted on Wednesday, September 14, 2005 - 09:25 am:    David, here are some of the companies we specify. Also,we specify that all insulated roof curbs shall be structural and shall include calculations signed and sealed by a registered Structural Engineer. Approved Manufacturers: 1. The Pate Co. 2. Custom Curb, Inc. 3. Roof Products, Inc. Ralph Liebing, RA, CSI Senior Member Username: rliebing Post Number: 221 Registered: 02-2003 Posted on Wednesday, September 14, 2005 - 10:13 am:    Brett, we have just moved to Roof Products exclusively, in view of the fact that Pate is out of business [bankrupt, I believe] and Custom Curb has been absorbed by and is part of Roof Products. The President of Roof Products formerly was part of [or owned] Custom Curb. Brett M. Wilbur CSI, CDT, AIA Senior Member Username: brett Post Number: 65 Registered: 12-2004 Posted on Wednesday, September 14, 2005 - 10:25 am:    Thanks Ralph, I'll pull my head out of the sand now and update my spec. ;o/ Craig Veselits (Unregistered Guest) Unregistered guest Posted on Wednesday, September 14, 2005 - 11:39 am:    Hello All. Just received an e-mail in regards to The Pate Company being out of business. WE ARE ALIVE AND WELL (after 42 years in business)! We recently relocated to brand new facility in Lombard, IL, which has tripled our manufacturing capacity. We also have a new catalog and CD available for immediate review. Please contact me at craigv@patecurbs.com or call 800.243.3018. Ralph Liebing, RA, CSI Senior Member Username: rliebing Post Number: 222 Registered: 02-2003 Posted on Wednesday, September 14, 2005 - 01:14 pm:    Mr. Veselits, I certainly stand corrected, but the information I passed along come to us from more than one source. So I am not sure what was going on, but appreciate your new information. David Axt, AIA, CCS, CSI Senior Member Username: david_axt Post Number: 540 Registered: 03-2002 Posted on Wednesday, September 14, 2005 - 01:52 pm:    Brett, Custom Curb is the company that is out of business.