we typically specify pre-manufactured flashing on most projects, but we consistently get requests for shop-fabricated flashing, in some instances we allow it - curious what direction my fellow spec writers follow?
Nearly all flashing I specify is shop-fabricated, whether by a sheet metal shop, curtain wall contractor, roofer etc. However, I actually simply specify the material and performance requirements without requiring it to be “shop fabricated” or otherwise. I’m not sure I see an advantage of pre-manufactured, and I don’t care one way or the other if it’s done right.
If/when wind uplift loads (IBC or FMG for copings and fascia/edges) are a factor, many pre-manufactured profiles have been tested, whereas shop-fab’d profiles would have generally required “per project” (i.e., relatively expensive) testing…although SMACNA has (only) recently developed wind uplift criteria for SOME “standard” SMACNA profiles.
Aha, the roof edge. That was not what I was thinking of in my post, but yes I do specify those most of the time if the project architect understands the issue noted above. (We’re still waiting, 8 years after saying we would do it, to adopt the IBC in Massachusetts. So in fact our code does not require the SE-1 roof edge test, though I prefer to use it anyway.)
We have transitioned over to “engineered [extruded] roof edge systems” in lieu of formed;
Systems [and details] that are tested and comply with ANSI/SPRI Standard ES-1, or FMG 1-90 for FMG INSURED BLDGS.
NRCA has a set of details tested to meet requirements of IBC AND a large list of companies that make products that comply. So your not limited to the three large companies that are often mentioned.
See: http://www.nrca.net/rp/technical/details/itslisting.aspx.
Code officials our here are not enforcing it.
Until the roof blows off.