Lead Flashing

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Author Message ken hercenberg Senior Member Username: khercenberg Post Number: 1109 Registered: 12-2006 Posted on Monday, October 02, 2017 - 03:35 pm:    Curious as to whether there have been any new developments in using lead at flashing, in this case at a roof drain surround. I don't know that we've discussed this since 2013 (http://discus.4specs.com/discus/messages/7868/6587.html). I haven't used it in years but I have a client in California who wants to use 4 pound sheet as a roof drain pan. Not sure why since we're specifying around PVC and KEE roof systems that have perfectly acceptable roof drain details. Anything new in the CBC? Ronald J. Ray, RA, CCS, CCCA, CSI, AIA Senior Member Username: rjray Post Number: 163 Registered: 04-2004 Posted on Monday, October 02, 2017 - 08:11 pm:    The only “CBC” I have heard of is the Canadian Broadcasting Corporation. I am uncertain of their relationship with lead flashing. As far as lead flashing for roof drains, that is the preferred material for modified bituminous and built-up roofing systems. I am not aware of any single-ply roof membrane manufacturer that would warranty an internal roof drain detail using lead flashing with any of the typical single-ply membranes (EPDM, TPO, PVC and related alloys, KEE, or CSPE.) Ronald L. Geren, FCSI, AIA, CCS, CCCA, SCIP Senior Member Username: specman Post Number: 1470 Registered: 03-2003 Posted on Monday, October 02, 2017 - 08:40 pm:    CBC - California Building Code...leaders in building regulation excess. The 2016 CBC doesn't directly mention roof drain pans, but it does list lead as an acceptable valley lining material per Table 1507.2.9.2. Therefore, if they allow it as valley flashing, then they would probably accept it for roof drain pans. I still specify lead for roof drain pans, but not for single plies or SPF roofing. Ron Geren, FCSI, AIA, CCS, CCCA, SCIP www.specsandcodes.com David J. Wyatt, CDT Senior Member Username: david_j_wyatt_cdt Post Number: 214 Registered: 03-2011 Posted on Tuesday, October 03, 2017 - 08:30 am:    This is one of those items many people keep specifying because they don't know if they should keep it or remove it. On the other hand I have had clients demand that it be omitted from BUR and modified specs because they "don't want hazardous materials in their buildings." Lack of understanding is the common trait with both. ken hercenberg Senior Member Username: khercenberg Post Number: 1110 Registered: 12-2006 Posted on Tuesday, October 03, 2017 - 11:25 am:    Thanks. I appreciate the confirmation. The past few years I've only been specifying single-ply membranes. I would pay money for a client that would use a good SBS-mod bit roof system. J. Peter Jordan Senior Member Username: jpjordan Post Number: 991 Registered: 05-2004 Posted on Tuesday, October 03, 2017 - 11:32 am:    I checked into this a little while back. The lead flashing must be used for roof drains on bituminous roofing (asphalt or mod-bit). I was told that you can't get a warranty if you don't use it. I will typically specify stainless steel for single ply roofs. J. Peter Jordan, FCSI, AIA, CCS, LEED AP, SCIP Jerome J. Lazar, RA, CCS, CSI, NCARB Senior Member Username: lazarcitec Post Number: 1805 Registered: 05-2003 Posted on Tuesday, October 03, 2017 - 01:25 pm:    Ken, for those FL Architects that are still using specs, Mod Bit Roofs are pretty popular, I just started a project with a Soprema Roof. Florida Architects that know their stuff prefer mod bit, though I prefer Fibertite.