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?
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.)
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.
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.
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.
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.
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.