standing seam metal roof attachment to insulation

Ordinary metal roof sheets rely on a significant overlap of some 200mm to prevent water intrusion but this is sometimes just not enough in cases of windblown rain or capillary action that can even drive water up hill and into the roof cavity. One of the most critical advantages of standing seam over ordinary metal roofing materials lies in standing seam’s superb weathertight design and the ability to form a virtually 100% watertight seal. Which Is More Weathertight: Standing Seam Or Ordinary Metal Roofing? Metal roofing has been around for a long time now and traditional products such as zincalume and galvanised corrugated iron have proven their usefulness as a roofing solution but they have some significant disadvantages compared to standing seam. Standing seam panels come in three basic styles: Standing seam, Snaplock, and Nail strip to cater to a wide variety of applications. Standing seam panels are durable and are suitable for a range of applications including vertical and near horizontal cladding situations. Standing seam panels can be used for roofing and wall claddings, and feature weathertight seals that are formed through a series of machine sealed vertical lips. Standing seam panels are a popular choice that offers a classy updated and vastly improved take on the strong profile of corrugated iron. I assume this has been done many times before and I would like to avoid reinventing the wheel.Standing seam metal roofs provide a modern roof profile that looks simply stunning on any home or commercial building. Architect suggested bearing walls at 4'oc cut down to the deck but there would still be point loads at each joist and uplift connections to deal with. Lots of little pieces and cutting holes through the deck to weld the columns down for up lift. I have considered running beams perpendicular to the joists at 4' oc with stub columns down to the joists. The existing structure is adequate for the loads. In this case, providing a structure over the existing structure seems like overkill.

On past projects with shorter spans and bearing walls, I have used light gauge trusses at 8' oc and hat type purlins at 4' oc or so to support the standing seam roof.

Narrow rib metal deck with 5' of insulation and a BUR. Joists span 45', are spaced 4' oc and have panel points about 4' oc. The slope of new roof would be parallel to the joists. The owner and architect want to place a standing seam metal roof over an existing conventional bar joist and metal deck roof system.

Standing seam metal roof attachment to insulation