b'Architectural Sheet MetalVALLEY TRIM ON STANDING SEAM METAL ROOFSPhoto 1by: Charlie Smith National Recover Manager | 238T Business Development Manager McElroy MetalV alleys on standing seam metal roofsridge and a floating eave where the panels are hooked on an can be a significant source of leaksextended eave trim or offset cleat. If the panels are floating if not installed properly. There are manyat the eave, they need to float in the valley as well. styles of valley trim and selecting the wrong style can spell disaster for anyValley Style Optionsproject. Asafirstpoint,considertheThere are several ways to make valley trim for an roofing assembly.For example, if youarchitectural application. The most common seems to use a water shedding valley on open purlins, there is a prettybe to fabricate the valley trim with integral hems. Most good chance you will end up with something like Photo 1. installers like doing this best and it gives a nice clean look. During my 35 years in this industry, Ive witnessed manyPhoto 2situations where a poor valley design or install comprised the entire weathertightness of the roofing system.A few ofThere are several my recommendations to stay out of trouble follow. problemswith Roof Assembly Considerations this,themain The first thing that must be determined is whether this isone being these an architectural application over solid deck or if this is avalleysections structural application where the roof is attached to openareextremely purlins, roof huggers or hat sections. Those two valleysdifficult to makePhoto 2are installed differently and really should be looked at aswatertight at the completely different applications. One thing all styles of valleylap. That is why trim have in common is the need for a diverter in the middle.this type of trim should only be installed on a solid deck with I prefer the diverter to be 1 1/2 tall instead of 1 and brokenice and water shield because there is a high probability it at the steepest angle possible to help ensure water doeswill leak. not shoot across and under the panels on the opposite side.On architectural applications I prefer to use a valley trim When you install a standing seam roof over a solid deckwith separate offset cleats that the panels hook onto. This you will most likely be using architectural details with a fixedgives you a valley that has a much higher chance of being 12 www.mrca.orgMidwest Roofer'