SHEET METAL AND AIR CONDITIONING CONTRACTORS' NATIONAL ASSOCIATION
(SMACNA)
SMACNA Arch. Manual
(2003, 6th Ed) Architectural Sheet Metal
Manual
1.2
DEFINITIONS
1.2.1
Field-Formed Seam
Seams of panels so configured that when adjacent sheets are installed the
seam is sealed utilizing mechanical or hand seamers. Crimped (45 degree
bend), roll formed (180 degree bend), double roll formed (2 - 180 degree
bends), and roll and lock systems are types of field-formed seam systems.
1.2.2
Snap Together Seam
Panels so configured that the male and female portions of the seam
interlock through the application of foot pressure or tamping with a
mallet. Snap-on cap configurations are a type of snap together system.
1.2.3
Pre-Formed
Formed to the final, less field-formed seam, profile and configuration in
the factory.
1.2.4
Field-Formed
Formed to the final, less field-formed seam, profile and configuration at
the site of work prior to installation.
1.2.5
Roofing System
The roofing system is defined as the assembly of roofing components,
including roofing panels, flashing, fasteners, and accessories which, when
assembled properly result in a watertight installation.
1.3
SYSTEM DESCRIPTION
1.3.1
a.
Panels shall be continuous lengths up to manufacturer's standard
longest lengths, with no joints or seams, except where indicated
or specified. Ribs of adjoining sheets shall be in continuous
contact from eave to ridge. Individual panels of snap together
type systems shall be removable for replacement of damaged
material.
b.
There shall be no exposed or penetrating fasteners except where
shown on approved shop drawings. Fasteners into steel shall be
stainless steel, zinc cast head, or cadmium plated steel screws
inserted into predrilled holes. There shall be a minimum of two
fasteners per clip. Single fasteners will be allowed when
supporting structural members are prepunched or predrilled.
c.
Snap together type systems shall have a capillary break and a
positive side lap locking device. Field-formed seam type systems
shall be mechanically locked closed by the manufacturer's locking
tool. The seam shall include a continuous factory applied sealant
SECTION 07611N
Page 7
Previous Page
