Item precedence in ceiling spaces

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Author Message Anne Whitacre, FCSI CCS Senior Member Username: awhitacre Post Number: 1194 Registered: 07-2002 Posted on Friday, August 26, 2011 - 07:07 pm:    hi all-some years ago I used to have a listing in one of my Division 01 spec sections (it was an alterations section) that listed an order of precedence for all the stuff that goes up above the ceiling. The list was used to help the contractor sort out which conditions were "most" important to maintain, and then it progressed with decreasing criticality. I remember parts of this list: 1) maintain runs and slopes for fire sprinkler piping 2)maintain air conditioning duct runs and then it progressed from there to include lighting fixtures, cable trays, fresh water piping runs; exhaust ducts; and I don't remember anything else. anyone have a comparable list that is complete? Nathan Woods, CCCA, LEED AP Senior Member Username: nwoods Post Number: 394 Registered: 08-2005 Posted on Friday, August 26, 2011 - 07:18 pm:    Random thoughts: 1. Ceiling framing components 2. Gravity piping (roof drains and plumbing waste lines) 3. Mechanical ductwork (including flanges, supports, and insulation where required) 4. Pressure piping (HVAC Hydronic piping, supply water piping, fire sprinkler piping). Allow for specified insulation thicknesses 5. Electrical condiuts and cable trays 6. Light fixtures (include clear space above fixture for ballasts) 7. Flex duct for registers and grilles 8. Electrical j-boxes for exit signs, smoke detectors, etc... guest (Unregistered Guest) Unregistered guest Posted on Saturday, August 27, 2011 - 04:55 pm:    are you dictating means and methods? John Regener, AIA, CCS, CCCA, CSI, SCIP Senior Member Username: john_regener Post Number: 538 Registered: 04-2002 Posted on Sunday, August 28, 2011 - 01:50 pm:    Is the BIM program programmed for these priorities so conflicts won't happen? Nathan Woods, CCCA, LEED AP Senior Member Username: nwoods Post Number: 395 Registered: 08-2005 Posted on Sunday, August 28, 2011 - 03:32 pm:    Various BIM programs will run "Clash Detection" analysis and will list where conflicts occur. Then the team works through them to resolve them on a case by case basis. It's actually really fun to sit down with the tin knockers, plumbers, electricians, and fire sprinkler guys and wrangle out all the spatial issues before steel is fabbed and delivered. Mark Gilligan SE, Senior Member Username: mark_gilligan Post Number: 413 Registered: 10-2007 Posted on Sunday, August 28, 2011 - 10:37 pm:    All BIM does is tell you whether eveything will fit if located exactly where detailed. You still need to account for tolerances. There also can be situations where if you install B before A there is not room enough to install A. Clash detection does not tell you how to do it right. Rather it tells you whether you have got it wrong and it may not do that in all cases. Anne Whitacre, FCSI CCS Senior Member Username: awhitacre Post Number: 1196 Registered: 07-2002 Posted on Tuesday, August 30, 2011 - 12:04 pm:    no, I am not dictating means and methods. I'm providing an order of precedence so that when there is a conflict (and this is an existing building with a relatively small plenum space) there is some general guidance in terms of what to prioritize when two things are trying to occupy the same space. Nathan's list is what I was looking for, and I'll confirm it with our consultants. Thanks!