Specifications - Lord and Son Construction, Inc.

embossed or greater than 8 ply (minimum 2.9 mils adhesive), heavy duty,
white or natural). Application procedures shall match the
manufacturer's written instructions.
h. At termination points, other than building entrances, the mastic
and cloth or tape shall cover the ends of insulation and extend 2
inches along the bare pipe.
3.3 DUCT INSULATION SYSTEMS INSTALLATION
Except for oven hood exhaust duct insulation, corner angles shall be
installed on external corners of insulation on ductwork in exposed finished
spaces before covering with jacket. Air conditioned spaces shall be
defined as those spaces directly supplied with cooled conditioned air (or
provided with a cooling device such as a fan-coil unit) and heated
conditioned air (or provided with a heating device such as a unit heater,
radiator or convector).
3.3.1 Duct Insulation Thickness
Duct insulation thickness shall be in accordance with Table 4.
Table 4 - Minimum Duct Insulation (inches)
Cold Air Ducts 2.0
Relief Ducts 1.5
Fresh Air Intake Ducts 1.5
Warm Air Ducts 2.0
Relief Ducts 1.5
Fresh Air Intake Ducts 1.5
3.3.2 Insulation and Vapor Retarder/Vapor Barrier for Cold Air Duct
Insulation and vapor retarder/vapor barrier shall be provided for the
following cold air ducts and associated equipment.
a. Supply ducts.
b. Return air ducts.
c. Relief ducts.
d. Flexible run-outs (field-insulated).
e. Plenums.
f. Duct-mounted coil casings.
g. Coil headers and return bends.
h. Coil casings.
i. Fresh air intake ducts.
Section 23 07 00 Page 25