STANDARD	1 Aug 1998	15081

UPDATES -

SECTION 15081

DUCT INSULATION

PART 1 GENERAL

1.1	SUMMARY

A.	Includes But Not Limited To

1.	Furnish and install thermal wrap duct insulation as described in Contract Documents.

B.	Related Work

1.	Section 15812 - Low-Pressure Steel Ducts

2.	Section 15820 - Duct Accessories

PART 2 PRODUCTS

2.1	MATERIALS

A.	Thermal Wrap Duct Insulation

1.	1½ inch thick fiberglass with aluminum foil scrim kraft facing and have a density of one lb/cu ft for applications requiring an R-value of 4.2.

2.	3 inch thick fiberglass with aluminum foil scrim kraft facing and have a density of one lb/cu ft for applications requiring an R-value of 8.

3.	Minimum R-value equals 4.2 for ductwork inside building envelope and an R-value of 8 for ductwork outside building envelope.

4.	Approved Manufacturers -	Approved Products

a.	Certainteed - Type 100 standard duct insulation

b.	Knauf - Duct Wrap FSK

c.	Manson - Alley Wrap FSK

d.	Owens-Corning - FRK

e.	Johns Manville - Microlite FSK

2.2	JACKETS

A.	Aluminum jacket: ASTM B209.

1.	Thickness: 0.020 inch thick sheet.

2.	Finish: Smooth.

3.	Joining: Longitudinal clip joints and two inch laps.

4.	Fitting: 0.016 inch thick die shaped fitting covers with factory attached protective liner.

PART 3 EXECUTION

3.1	INSTALLATION	Installation

In areas of high humidity, wrap exhaust ducts above the building insulation envelope with thermal insulation. Where there is little possibility that humidity conditions will cause condensation problems, delete the exhaust duct insulation.

A.	Thermal Wrap Duct Insulation

1.	Install insulation as follows -

a.	On air ducts outside building insulation envelope, installed R-value shall be a minimum of R-8.

b.	On all supply air ducts and return air ducts of RTU-1 and RTU-2.

2.	Do not compress insulation except in areas of structural interference.

3.	Completely seal joints.

B.	Provide aluminum jacket on exterior supply ductwork associated with RTU-1 and RTU-2. Install ductwork and jacket so as to prevent standing water on ductwork.

END OF SECTION