2.5.2.3
Vault
Vault skylights shall be [single] [double] glazed. Barrel vault height,
for low rise vaults, shall be 10% of the vault width, and 50% of the vault
width for half round vaults; outside curbs shall be provided by the
Contractor in accordance with the manufacturer's details. Vaults shall
support a 1.4 or 1.9 MPa 30 or 40 psf roof snow or live load, and a
negative 1.2 MPa 25 psf wind load plus dead load; rafter spacing shall be
determined by load requirements but shall not exceed 900 mm 36 inches on
center for 1.9 MPa 40 psf and 1200 mm 48 inches on center for 1.4 MPa 30 psf.
Sill members shall weep water infiltration and condensation, and shall be
factory slotted at anchors for thermal movement. All gaskets shall be
EPDM. All units over 2.2 m 87 inches shall be shipped unassembled for
access to anchors from roof level.
2.5.3
Framed Skylights
Framed skylights shall [be designed to [_____] size] [span up to [3.4]
[_____] m [12] [_____] feet in a single pitch and up to [6] [_____] m [20]
[_____] feet in a double pitch configuration]; rafter and purlin spacing
shall be determined by loading requirements. Skylights manufactured in
prefabricated sections easy to install are available in a wide range of
standardized pitches. Framing members shall be [tubular] [I-beams];
deflection of rafters shall not exceed [L/175] [L/180] [_____] of the
rafter span. A registered professional engineer shall size all framing
members and design all structural connections; the Contractor shall submit
a copy of the calculations. Framing shall include a primary gutter system
with secondary gutters to control water infiltration and condensation
runoff from the underside of the glazing material and channel it to the
exterior. Skylight structural members shall be designed for a live load of
[_____] MPa psf and wind load of [_____] MPa psf; no objectionable
distortion or stress in fastenings and joinery due to expansion and
contraction shall be induced when subjected to a 55 degree C 100 degree F
temperature change.
2.6
FLEXIBLE SEALING TAPE
Sealing tape shall be manufacturer's standard pre-applied to closure system
at the factory under controlled conditions.
PART 3
EXECUTION
3.1
PREPARATION
The Contractor shall verify when structural support is ready to receive all
specified work and to convene a pre-installation conference, if approved by
the Contracting Officer, including the Contractor, skylight installer and
all parties directly affecting and affected by the specified work. All
submitted opening sizes, dimensions and tolerances shall be field verified;
preparation of openings shall include isolating dissimilar materials from
aluminum system to avoid damage by electrolysis. The installer shall
examine area of installation to verify readiness of site conditions and to
notify the Contractor about any defects requiring correction. Work shall
not commence until conditions are satisfactory.
3.2
ERECTION
Translucent skylight system shall be erected in accordance with the
approved shop drawings supplied by the manufacturer. Fastening and sealing
SECTION 08600
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