addendum #1 - pdx.edu addition to the 1-hour ceiling tiles that are specified in the itb we also...

Portland State University | University Center Building (UCB) 3rd and 4th Floor HVAC Upgrade ITB

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UCB 3rd & 4th Floor HVAC Upgrade Solicitation #1549

Invitation to Bid (ITB) for General Contractor Services

ADDENDUM #1

March 9, 2015

This Addendum is issued to provide answers to questions from potential bidders and to inform you of the following revisions to the above-referenced ITB and the Contract Documents for the Project. Where this Addendum is inconsistent with the ITB or any previous addenda, this Addendum shall control. Bids shall conform to this Addendum. Unless specifically changed by this Addendum, all other requirements, terms and conditions of the ITB, and any previous addenda, remain unchanged and can be modified only in writing by PSU.

A. SCHEDULE REMINDER: 1. 2nd Walk Through tomorrow, March 10th at 11:00 AM – Meet in USB Room 302T

2. Questions, solicitation protests and substitution request due Friday, March 13th by 5:00 PM

3. Bids due and Public Bid Opening will be held on Thursday, March 19th at 2:00 PM in USB Room 302T

B. SPECIFICATIONS: In addition to the 1-hour ceiling tiles that are specified in the ITB we also need to provide a 1-hour fire rated

supply and return diffuser assembly. In lieu of what is currently specified see attached.

C. ATTACHMENTS:

1. Sign in Sheet

2. 3rd and 4th floor pictures above drop ceiling

3. Fire Rated Diffuser (Supply and Return) Cut Sheet

4. Fire Rated Diffuser (Supply and Return) Specification

D. CLARIFICATIONS: 1. The vast majority of the drop ceiling does not contain insulation above it there are some areas in which the

insulation from the structure above has fallen. See attached pictures.


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3rd & 4th Floor Pictures Above Drop Ceiling

3rd Floor

4th Floor


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Fire Rated Diffuser (Supply and Return) Cut Sheet


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Fire Rated Diffuser (Supply and Return) Specification

Suggested Division 15 Specification

Perforated Ceiling Diffusers

Steel Model: PAS - Supply, Flush Face

Perforated ceiling diffusers shall be TITUS models PAS (steel, flush face) for supply. The return models shall have the

same face and border construction as the supply models for harmonious appearance in the room. Diffusers shall have a

perforated face with 3/16-inch diameter holes on ¼-inch staggered centers and no less than 51 percent free area.

Perforated face shall be steel. The backpan shall be one piece stamped heavy gauge steel of the sizes and mounting

types shown on the plans and outlet schedule. The diffuser neck shall have 1 1/8-inch depth for easy duct connection.

Diffusers must discharge a uniform horizontal blanket of air into the room and protect ceiling against smudging. Pattern

controllers in the supply models shall be mounted on the back of the perforated face and must be field adjustable to

allow the discharged air to enter the room in either vertical or one-, two-, three- or four-way horizontal jets. The

perforated face must be easily unlatchable from the backpan to facilitate option of the face for pattern controller

adjustment or to access an optional damper.

The finish shall be #26 white. The finish shall be an anodic acrylic paint, baked at 315°F for 30 minutes. The pencil

hardness must be HB to H.

The paint must pass a 100-hour ASTM B117 Corrosive Environments Salt Spray Test without creepage, blistering or

deterioration of film. The paint must pass a 250-hour ASTM D870 Water Immersion Test. The paint must also pass the

ASTM D2794 Reverse Impact Cracking Test with a 50-inch pound force applied.

Optional damper shall be constructed of heavy gauge steel. Damper must be operable from the face of the diffuser by

unlatching the diffuser face. The diffuser must be designed such that complete removal of the face is not required

during damper adjustment.

The manufacturer shall provide published performance data for the perforated diffuser. The diffuser shall be tested in

accordance with ANSI/ASHRAE Standard 70-1991.

E-mail questions regarding this procurement to: [email protected]

END OF ADDENDUM #1

mailto:[email protected]