Gutters are a common method for collecting and removing
rainwater from low-slope structural metal panel roof systems.
Architectural Sheet Metal and Metal Roofing Manual—2006
Edition, provides five details for structural metal panel
roof systems with gutters at eaves. Detail S-MTL-3B, "Downslope
Flashing with Gutter with Brackets—'T' Type," provides
information specific to flat-pan vertical-seam structural metal
panels incorporating a T-type edge-metal flashing and gutter.
In this detail, a T-type edge metal is fastened to a structural
framing member with the option of including sealant tape between
the top of the wall and the edge metal. Where there are concerns
that water backup or ice dams will occur, the use of sealant tape
is strongly recommended. T-type edge-metal thickness and attachment
method(s) should be based on anticipated uplift loads and desired
resistance. A reference note guides users to a table with minimum
gauge recommendations for edge metal.
The flat-pan structural panels are hooked to the T-type edge
metal to provide uplift resistance and weatherproofing. If panels
are fixed at the eaves, no movement will occur at the eaves. If
panels are fixed at the midpoint or ridge, the panels' expansion
and contraction need to be accounted for. Movement generally is
accommodated by increasing the length of the panel hook and width
of the T-type edge metal and providing a gap that accommodates
expected movement. This allows movement without damaging the
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