2017030-08_2019-09-11_Addendum-1.pdf

2012012-03_17-0124_Addendum-1.docx

ADDENDUM NO. 1

PAGE - 1

Addendum No. 1

Issue Date: September 11, 2019

USDA Forest Products Laboratory B50 Conditioned Room Project

MADISON, WISCONSIN 53716

Project No. 2017030.08

This Addendum is issued to modify, explain or correct the original drawings and specifications and is hereby made a part of the Contract Documents. Please attach this Addendum to the Bid Documents in your possession.

SPECIFICATIONS

Section 23 07 00 Mechanical Insulation

1. Clarify insulation products for exposed round ductwork.

DRAWINGS

1. No Change

ATTACHMENTS

1. Specification: 23 07 00 Mechanical Insulation

END ADDENDUM NO. 1

STRANG, INC.

811 East Washington Avenue, Suite 200 Madison, WI 53703

(608) 276-9200

USDA Forest Products Laboratories B50 Conditioned Room Project Project No. 2017030.08

MECHANICAL INSULATION

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[ADDENDUM 01]

SECTION 23 07 00 - MECHANICAL INSULATION

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Applicable provisions of Division 1 shall govern work under this section.

B. Section 23 31 13 - Acoustic lined air ducts.

C. Section 23 33 00 – Duct Accessories

1.2 DESCRIPTION OF WORK

A. Provide thermal insulation for piping, ductwork and equipment as specified herein.

B. Insulation thicknesses required for the various system types are as scheduled on plans, as required by the Wisconsin Administrative Code, and as specified herein. In case of conflict, the more rigid requirement shall apply. All insulation thicknesses listed are based on a minimum thermal efficiency (R-Value) with the intent to provide a minimum thermal efficiency.

C. Insulate portions of existing piping, ductwork, and equipment where existing insulation was removed by Owner’s abatement contractor and for new connections to existing systems by Division 23 contractor.

1.3 1.3 SUBMITTALS

A. Submit insulation schedule indicating service location, product type (manufacturer), and product thickness. Include performance data for each type of product used.

B. Certifications: Submit certifications, ESR report for material and methods or other data as necessary to show compliance with these specifications and governing regulations.

1.4 QUALITY ASSURANCE

A. Installer shall be firm trained and regularly engaged in the application of mechanical insulations. Installer shall be responsible for all debris, rubbish and damages to building parts caused by his operation.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Insulation products: Subject to compliance with requirements, provide products of one of the following: Armacell, CertainTeed, Manson, Childers, Dow, Extol, Fibrex, Halstead, Foster, Imcoa, ITW, Johns Manville, Knauf Insulation, Owens-Corning, Pittsburgh Corning, VentureTape or approved equal.

B. Jacketing products: Subject to compliance with requirements, provide products of one of the following: Alumaguard; MFM Building Products; Venture Clad or approved equals.

2.2 FLAME SPREAD/SMOKE DEVELOPED RATING

A. Use composite insulation systems (insulation, jackets, sealants, mastics, and adhesives) that have a flame spread rating of 25 or less and smoke developed rating of 50 or less, with the following exceptions:

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[ADDENDUM 01]

1. Pipe insulation which is not located in an air plenum may have a flame spread rating not over 25 and a smoke developed rating no higher than 450 when tested in accordance with UL 723 and ASTM E84.

2.3 FIBERGLASS PIPE INSULATION

A. Fiberglass pipe insulation shall be rigid heavy density insulation with "K" factor of .23 at 75oF and factory applied fire retardant vapor barrier jacket of white kraft bonded to aluminum foil with fiberglass reinforcing, and self-sealing pressure sensitive adhesive lap.

Rated for service to 450oF. Manville Microlok 650.

B. Fiberglass Pipe Fitting Insulation:

C. Pipe fittings and valves shall be insulated with premolded fiberglass fittings or mineral wool cement with ¼" coat of hydraulic setting finishing cement to a thickness equal to adjacent pipe insulation. Vapor seal fittings with fiberglass tape and completely seal with Benjamin Foster 30-35. Preformed PVC jackets may be used.

D. All other pipe fittings and valves may be insulated with fiberglass miter segments of equal thickness of adjoining insulation with ¼" coat of hydraulic setting finishing cement. Vapor seal fittings with fiberglass tape and completely seal with Benjamin Foster 30-35.

2.4 POLYISOCYANURATE INSULATION:

A. Rigid closed cell polyisocyanurate, minimum nominal density of 2.0 lbs. per cu. ft., thermal conductivity of not more than 0.19 at 75 degrees F mean temperature aged 180 days, minimum compressive strength of 24 psi parallel and 13 psi perpendicular, maximum water vapor permeability of 4 perm inch, maximum water absorption of 2% by volume, rated for service temperature range of -290 degrees F to 300 degrees F. ASTM E84 25/50 flame spread and smoke developed rating except piping exposed within mechanical rooms. ITW Trymer 25-50 (above ceilings), ITW Trymer 2000XP (mechanical rooms).

2.5 RIGID FIBERGLASS DUCTWORK INSULATION

A. Rigid fiberglass ductwork insulation shall be board type insulation with "K" factor of .25 at 75oF, 6.0 lbs./cubic foot density and foil reinforced kraft facing. Owens-Corning Type 705.

2.6 SEMI-RIGID FIBERGLASS DUCTWORK AND EQUIPMENT INSULATION

A. Rigid, resin bonded fibrous glass a damage-resistant, flame retardant, reinforced aluminum foil (FRK), "K" factor of .27 at 75oF, 3 lbs./cubic foot density, 450oF temperature rating. 125psf compressive strength at 10% deflection, Owens-Corning Fiberglas Pipe and Tank.

2.62.7 ACCESSORIES

A. Bedding Compounds: Non-shrinking, permanently flexible, compatible with insulation.

B. Vapor Barrier Coating: Nonflammable, fire resistant, polymeric resin, compatible with insulation.

C. Insulating Cement: ANSI/ASTM C195, hydraulic setting mineral wool.

D. Wire Mesh: Corrosive resistant metal, hexagonal pattern.

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[ADDENDUM 01]

E. Inserts and Shields: Construct inserts with calcium silicate or polyisocyanurate (service temperatures below 300 degrees F only), minimum 140 psi compressive strength. Piping 12” and larger, supplement with high density 600 psi structural calcium silicate insert.

Provide galvanized steel shield. Insert and shield to be minimum 180 degree coverage on bottom supported piping and full 360 degree coverage on clamped piping. On roller mounted piping and piping designed to slide on support, provide additional load distribution steel plate.

2.72.8 JACKETS

A. PVC FITTING COVERS AND JACKETS (PFJ): White PVC film, gloss finish one side, semi-gloss other side, FS LP-535D, Composition A, Type II, Grade GU. Ultraviolet inhibited indoor/outdoor grade to be used where exposed to high humidity, ultraviolet radiation, in kitchens or food processing areas or installed outdoors. Jacket thickness to be minimum .02” indoors/.03”outdoors for piping 12” and smaller, .03” indoors/.04” outdoors for piping 15” and larger.

B. VAPOR RETARDING JACKETS (VRJ): Polyvinylidene chloride vapor retarding jacket material with minimum 6 mils material thickness and maximum permeance of 0.01 perms. Material shall not support the growth of mold or mildew. Dow Saran or equivalent.

1. Vapor retarding tape shall be specifically designed and manufactured for use with the vapor retarding jacket specified above. Tape shall be provided by the same manufacturer that provides jacketing. Vapor retarding tapes used with vapor retarding jackets shall have a maximum permeance of 0.01 perms.

PART 3 - EXECUTION

3.1 HVAC STEAM, CONDENSATE, AND HOT WATER PIPING INSULATION

A. Steam, condensate, and hot water piping insulation shall be fiberglass pipe insulation.

See schedule for thickness. Omit insulation on flexible connections. Insulate flanges, unions, valves and strainers and cover with PVC jacket for ease of future removal.

3.2 CHILLED WATER PIPING INSULATION

A. All cold piping and chiller cold surfaces shall be insulated with polyisocyanurate insulation with vapor retarding jacket per schedule.

3.3 INTERIOR SUPPLY AND RETURN DUCTWORK INSULATION

A. Interior supply ductwork shall be insulated with rigid exterior fiberglass duct board or flexible fiberglass duct wrap, per schedule. Vapor barrier shall be provided. See schedule for thickness. Interior dimensions of lined ducts to be as noted on drawings.

B. Where preinsulated flexible ductwork is used, wrap uninsulated flex duct connections to sheet metal duct and to diffuser with flexible fiberglass duct wrap.

C. Where uninsulated plenum diffusers are utilized, wrap exterior of plenum with flexible fiberglass duct wrap.

3.4 INSULATION INSTALLATION

A. Install insulation products in accordance with manufacturer's written instructions and in accordance with recognized industry standards to ensure that insulation serves its intended purpose. Clean and dry surfaces prior to installation. Apply when surfaces to be insulated are at room temperature. Use adhesives, sealers, protective finishes, Project No. 2017030.08

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[ADDENDUM 01]

staples, bands, wires, studs, pins, clips, etc. as recommended by manufacturer. Staples or other fasteners that may puncture vapor barrier shall not be used on chilled water, supply air duct or condensate drains. Maintain integrity of vapor barriers. Extend insulation without interruption through walls, floors and similar penetrations, except where otherwise indicated. Install protective metal shields and insulated inserts wherever needed to prevent compression of insulation. Do not insulate over nameplates and labels, bevel and seal around such. Fill cracks, joints, seams and depressions with bedding compound or vapor barrier cement. Provide smooth finish on all insulated surfaces.

B. Fiberglass pipe insulation shall be continuous, uninterrupted through the hanger. Hanger shall be sized for the outside diameter of the pipe insulation. Install sheet metal shield between bearing point of hanger and insulation. Provide inserts where required. All Insulation material shall be applied only when ambient temperature is between 40 oF and 110 oF. Adhesive and lap must be free from dirt and water. Pressurize lap seal repeatedly with sealing tool. Wrap end joints with 3" wide vapor barrier tape. Seal off ends of pipe insulation with glass cloth and vapor barrier coating.

C. Rigid fiberglass ductwork insulation shall be impaled over suitable mechanical fasteners attached 18" on center maximum and secured with speed washers. Seal all joints and cracks with vapor barrier tape.

3.5 CONDENSATE DRAIN PIPING

A. Condensate drain piping from AHU drain pans, intake and exhaust plenums shall be insulated as scheduled for cold water piping.

3.6 JACKETS

A. PVC jacket: Lap seams and joints a minimum of 2 inches and continuously seal with welding solvent recommended by jacket manufacturer. Lap slip joint ends 4" without fasteners where required to absorb expansion and contraction. For sections where vapor barrier is not required and jacket requires routine removal, tack fasteners may be used.

B. Vapor retarding jackets: Piping with vapor retarding jackets shall have elbows, fittings, valves and butt joints wrapped with 2 layers of vapor retarding tape. For piping without a jacket, wrap jacket with 1” wide vapor retarding tape at 12” centers with a 25% overlap.

Piping with a PVC jacket installed over the vapor retarding jackets may be provided with a single, lapped layer of vapor retarding tape for elbows, fittings and valves under the PVC jacket. Vapor retarding tape shall be compatible with the jacket material used.

3.7 INSULATION SCHEDULES

Piping Service Insulation Insulation Thickness by Pipe Size

Type * 1" and 1- ¼ " 2" 5" 8" and smaller to1-½" to 4" to 6” larger

Hot Water Heating rigid fiberglass 1-½" 1-½" 2" 2" 2" Chilled Water Piping polyiso w/VRJ 1-½" 1-½" 1-½" 1-½" 1-½" Cool. Coil Condensate rigid fiberglass 1" 1" 1" 1" 1" Low Pressure Steam rigid fiberglass 1-½" 1-½" 2-½" 2-½" 3-½" Low Pressure Cond. rigid fiberglass 1-½" 1-½" 2" 2" 3-½"

Duct Service Insulation Type Thickness (Minimum) Mixed air ducts rigid fiberglass(rectangular) 1" semi-rigid fiberglass (round) Exposed supply and return ducts rigid fiberglass (rectangular) 1"

Semi-rigid fiberglass (round)

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[ADDENDUM 01]

* Exposed return ducts located in the space they are serving do not require insulation. Exposed return ducts located in Mechanical rooms shall be insulated as exposed ducts scheduled above.

Double wall ducts do not require insulation.

Equipment Type Insulation Type Thickness Humidifier separator rigid fiberglass 2"

END SECTION 23 07 00