Bid #01-1112 Library and Reprographics Roofing ... - Citrus College

E. Fabricate and install split-lead flashings incorporating a water-tight rain collar at heat stacks.
F. Furnish the specified edge metal and coping systems to match the existing and install in
strict accordance with the roofing manufacturer's specifications and details.
G. Provide and install new counter flashing on all walls and curbs.
H. Furnish and install Chem-Curbs at all unistruts.
I. Submit a unit cost per drain to lower them down to the metal deck if necessary.
J. Where necessary, Remove stucco to provide a minimum 8” flashing height. Mechanically
fasten 1/2 inch plywood to the studs. Install stucco stop and new stucco to match existing.
K. Provide ceramic granule anti-skid surfacing ( Library Mechanical Well). Layout to be
discussed during the pre-bid meeting.
RELATED WORK FOR MECHANICAL EQUIPMENT REQUIRING ALTERATION DURING
REROOFING OPERATIONS
A. Ducts and related sheet metal items such as plenums shall be designed, fabricated,
insulated, constructed, and sealed according to the requirements detailed in the most recent
edition of the HVAC Duct Construction Standards as published by SMACNA. In addition,
the following general guidelines by SMACNA should be considered:
1. All ducts that are not watertight through the use of welded construction or protective
shields and are exposed to weather and solar radiation shall have secure watertight
mechanical connections and receive exterior duct sealant treatment as defined in the
following paragraph.
2. Exterior duct sealant treatment shall consist of the supplemental application of a product
or products marketed specifically as forming a positive air and watertight seal, bonding
well to the metal involved, remaining watertight with metal movement and having a
suitable service temperature range. If exposed to direct sunlight, the sealant treatment
should be ultraviolet ray and ozone resistant and should, after curing, be painted with a
compatible coating that provides that resistance. The term "sealant" is not limited to
materials of adhesive or mastic nature but is inclusive of tapes and combinations of
woven fabric strips and mastics. Asphalt based compounds are not approved for sealing
ductwork.
3. Unless otherwise prescribed by the equipment manufacturer, ducts and related sheet
metal items shall be attached to equipment with mechanical fasteners supplemented
with exterior duct sealant treatment as defined in the above paragraph. The attachment
method shall accommodate disconnection if this is required for routine maintenance of
the equipment.
4. Where vibration dampening isolation material is required at the connection of ducts to
equipment, such material shall be watertight.
5. Roof penetrations by ducts shall utilize counterflashed curbs which are constructed
according to NRCA standards and counterflashed as directed by the roofing material
manufacturer.
M-13-135 page - 4 Citrus Library Roofing Specification