substitution request - Alliance Construction Solutions

F. Maintain integrity of vapor barrier jackets on cold pipe insulation, and protect to prevent
puncture or other damage.
1. Do not use staples or tacks on vapor barrier jackets.
2. Seal vapor barrier penetrations with vapor barrier finish recommended by the
manufacturer.
3. Seal fitting covers with PVC tape.
4. Cover all unions, check valves, and other in-line devices. Mark outer covering
with indelible marker to identify item covered.
G. Neatly bevel insulation at all exposed edges, and seal with finishing cement.
H. At locations where PVC covers are prohibited, the Contractor shall insulate fittings, etc.,
using one coat of insulation cement, premolded fiberglass fitting covers and/or segments
of pipe insulation. Finish shall be ASJ jacket or glass fabric embedded in fire retardant
mastic. Raw ends shall be coated with vinyl acrylic mastic (CP-10/11) for hot piping or
shall be coated with vapor barrier mastic (CP-30 or Fosters 30-35) for cold piping.
I. Cover valves, fittings and similar items in each piping system with equivalent thickness and
composition of insulation as applied to adjoining pipe run. Install factory molded, precut
or job fabricated units (at Installer's option) except where specific form or type is indicated.
J. Pipe insulation shall be continuous through walls and floor openings except where walls
and floors are required to be firestopped.
K. Insulation on all cold surfaces shall be applied with a continuous, unbroken vapor seal.
Supports, anchors, etc. that are secured directly to cold surfaces shall be adequately
insulated and vapor-sealed to prevent condensation.
L. Piping installed below grade shall be spiral wrapped with 10 mil PVC tape (Scotchwrap
No. 50 or equal) with 50% overlap, and laid in bed of sand with 3” minimum cover on all
sides. Fittings shall be double-wrapped with second layer extended a minimum of 12”
beyond fittings.
M. See Section 220529 for insulation inserts and shields. Butt pipe insulation against pipe
hanger insulation inserts. For all piping, apply wet coat of vapor barrier lap cement on
butt joints and seal all joints and seams with 3” wide vapor barrier tape or band.
N. Cellular Glass Insulation:
1. Apply in a single layer. Secure to pipe with 1/2” wide aluminum bands.
2. For indoor applications, apply all-purpose Kraft paper/aluminum foil/vinyl coating
jacket. Seal all lap and butt joints with self-sealing vapor barrier tape.
O. Calcium Silicate Insulation:
1. Secure 3/4" high rib lath by wire on 16” centers with ribs turned to create 3/4” air
space. Secure metal lath to outstanding ribs by welding or wire on 16” centers to
serve as insulation base. Secure insulation to metal lath with 14-gauge
galvanized wire ties on 16” centers. Stretch 1” hexagonal, 20-gauge mesh
smoothly and securely over insulation. Apply 1/2” thick coat of insulating and
finishing cement to exterior surface, and finish smooth. Allow cement to dry, and
cover with 8-oz. canvas applied with lagging adhesive. Brush with one final coat
of lagging adhesive.
Project No.: 10145
550 15 th Street Dual Brand Hotel
03/16/2012
22 0719 - 7 PLUMBING INSULATION