2020.09.09_19169_OTSEGO WASHINGTOIN ES_HS_REROOF ADDENDUM 1.pdf

PDF 945 KB Posted Sep 14, 2020

Attached to: Washington Street Elem and Otsego High School Roofs
Solicitation number: RFP OTS 200000002324 2
Issued by: Allegan County, Oden CDP, Michigan

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Written by GovTribe AI · Mar 12, 2026

This is Addendum No. 1 to the bidding documents for a membrane re-roof project at Otsego-Washington Elementary and High School, issued by Otsego Public Schools on September 9, 2020, for Architect's Project No. 19-169.20. The project involves a complete roof covering replacement at 538 Washington Street, Otsego, Michigan, with total roof areas across multiple sections totaling approximately 31,655 square feet, plus additional areas requiring tapered insulation installation. The original bid issue date was August 27, 2020. The project scope includes full demolition of existing roof systems down to the roof deck in designated areas, installation of new roof membranes with 4-inch insulation and 1/2-inch coverboard in tear-off areas, and preparation of existing roof surfaces for new membrane application in overlay areas. The addendum clarifies roofing specifications and approved manufacturers, updates demolition and roof replacement drawings, and identifies tapered insulation requirements for sloped and flat roof areas. The district will conduct an extensive evaluation process with a minimum of three responsive bidders, implementing post-bid interviews to clarify bids and answer project-related questions.

The roofing project is a direct result of the district's plan to install solar panels, which is a separate project. Bidders must provide a minimum 20-year warranty from the date of substantial completion and design for a minimum wind speed of 72 miles per hour. For rehabilitation of single-ply roofing, only Tremco and Sika are approved manufacturers; however, voluntary alternate bids from other manufacturers are acceptable and will be evaluated individually, provided they are identified as voluntary alternates on the bid envelope. Alternate roofing systems and material types from approved manufacturers may be bid and will be evaluated on an individual basis. The district is not obligated to award the bid to the lowest bidder and reserves the right to select the best approach to achieve district goals.

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File	Type	Posted
2020.08.27_19169_OTSEGO WASHINGTON ES_HS_REROOF SPECIFICATION.pdf	PDF	Sep 14, 2020
Upload.url	URL file	Sep 14, 2020
2020.08.27_19169_OTSEGO WASHINGTON ES_HS_REROOF DRAWINGS.pdf	PDF	Sep 14, 2020

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Nurturing curiosity through design since 1953 • towerpinkster.com

ADDENDUM NO. 1

DATE OF ISSUANCE: September 09, 2020

PROJECT: Otsego – Washington Elementary and High School Re-Roof

538 Washington Street

Otsego, MI 49078

OWNER: Otsego Public Schools

ARCHITECT’S PROJECT NO.: 19-169.20

ORIGINAL BID ISSUE DATE: August 27, 2020

SCOPE OF WORK

This Addendum includes changes to, or clarifications of, the original Bidding Documents and any previously issued addenda, and shall be included in the Bid. All of these Addendum items form a part of the Contract Documents. The Bidder shall acknowledge receipt of this Addendum in the appropriate space provided on the Bid Form. Failure to do so may result in disqualification of the Bid.

DOCUMENTS INCLUDED IN THIS ADDENDUM

This Addendum includes Two (2) pages of text and the following documents:

• Bidding Documents: None

• Contract Conditions: None

• Specification Sections: None

• Drawings: AD111

NOTABLE ITEMS

The evaluation process for this bid will be extensive, the potential bidders will be grouped, and a post bid interview process will be implemented to further understand each of the bids. It is anticipated a minimum of 3 responsive bidders will be considered and post bid interviews will be set up to provide an opportunity for the bidder to explain their bid and answer questions related to the project. The district is not under any obligation to award low bid on this project.

CHANGES TO SPECIFICATIONS

ADD-1 Item No. S-1 - Specification Section 07 5323 – Approved Manufacturers

Refer to Specification Section:07 5323

It is understood not all manufacturers listed make the Fleeceback EPDM sheet.

9.9.2020 Addendum No. 1 // Otsego – Washington Elementary and High School Re-Roof // 19-169.20 2

This re-roofing project is a direct result of the district’s desire to enter into a contract with a solar panel provider. The existing roofing systems will need to be improved prior to setting solar panels. Note: The solar panel project is separate from this project. The intent of the project is to provide a new roof covering for the buildings that can perform to the parameters outlined in the spec. and as amended below:

Minimum warranty period 20 years from date of substantial completion

Wind Speed, Minimum of 72 mph

Alternate systems and roofing material types from the manufacturer’s listed can be bid for the membrane roof re-covering and replacement. Alternate systems and materials will be evaluated on an individual basis to determine the best approach to achieve the district goals.

ADD-1 Item No. S-2 - Specification Section 07 0150.74 – Approved Manufacturers

Refer to Specification Section:07 0150.74

Because of the desire of the District to install solar panels on these roofs in the future. The manufacturers identified in the Rehabilitation of Single Ply Roofing (Tremco and Sika) are the only approved manufacturers for this application.

As with all school projects voluntary alternate bids are acceptable and will be evaluated on an individual basis and must be identified on the bid envelope “Voluntary Alternate”.

CHANGES TO DRAWINGS

ADD-1 Item No. D-1 - Full Roof Removal

Refer to Re-Issued Sheet(s): AD111

Updated Demo sheet to clarify the shading pattern to show the roofs that are to be fully removed down to existing roof deck and installed new.

ADD-1 Item No. D-2 - Tapered Roof Insulation

Refer to Re-Issued Sheet(s): AD111

Areas of existing sloped and flat roof areas identified where new tapered roof insulation will be required.

ADD-1 Item No. D-3 - Roof Replacement Clarification

Refer to previously issued Sheet(s): A 111

The roof replacement for the tear off areas shall be replaced as noted on this sheet: 4 inch insulation with

1/2 inch coverboard.

END OF ADDENDUM.

A.1

C.1

E.1

1 2 3 4 5 6 7 8 9

10 11 12 13 14 15

16 17 18 19 20 21 22 23 24

25 26 27 28 29 30 31

EX.R.D. EX.R.D.

EX.R.D.EX.R.D.

EX.R.D. EX.R.D.

EX.R.D.EX.R.D.

EX.R.D.

EX.R.D. EX.R.D.

EX.R.D.

EX.R.D.EX.R.D.

EX.R.D.

9,672 SF

18,652 SF

9,806 SF

2,755 SF 31,655 SF 2,525 SF

1,104 SF 2,790 SF

10,927 SF

152 SF

2 4

EX. BRICK CHIMNEY

EX. ROOF

EXPANSION JOINT

EX. ROOF

EXPANSION JOINT EX. ROOF

EXPANSION JOINT

EX. ROOF

EXPANSION JOINT

30' - 10" 55' - 10" 30' - 10"

16' - 11"

8' - 8"

22' - 7"

22' - 8"

8' - 2" 9' - 7"

6 6

57' - 11"

22' - 8"

DEMOLITION ROOF PLAN KEY

COMPLETE DEMOLITION OF EXISTING ROOF SYSTEM

ROOF SLOPE DUE TO TAPERED INSULATION OR

SLOPED STRUCTURE - REFER TO STRUCTURAL DRAWINGS

EX.R.D. EXISTING ROOF DRAIN - SEE PLUMBING DRAWINGS

OUTLINE OF EXISTING ROOF SYSTEM

GENERAL DEMOLITION NOTES

1. CONTRACTORS ARE REQUIRED TO INSPECT/REVIEW THE EXISTING BUILDING PRIOR TO

RELATED DEMOLITION WORK. UNLESS NOTED OTHERWISE, REMOVAL OF ANY WALL,

FLOOR OR CEILING INCLUDES ALL GENERAL MECHANICAL AND ELECTRICAL ITEMS

WHICH ARE A PART OF, OR ATTACHED TO IT.

2. CONTRACTOR SHALL VERIFY ALL EXISTING JOB SITE CONDITIONS AND DIMENSIONS

AND BE RESPONSIBLE FOR THE SAME. ADVISE CONSTRUCTION MANAGER OF ANY

AND ALL DISCREPANCIES.

3. PATCH FLOORS, WALLS AND CEILINGS DAMAGED DURING CONSTRUCTION AND

DEMOLITION AS REQUIRED. FINISH TO MATCH EXISTING.

4. ACCOMMODATE NEW CONSTRUCTION IF NOT INDICATED.

5. PROTECT ALL EXISTING FINISHES THROUGHOUT PROJECT.

6. REFER TO DEMOLITION ELEVATIONS, SECTIONS AND DETAILS FOR ADDITIONAL

INFORMATION.

7. REFER TO STRUCTURAL, MECHANICAL, PLUMBING AND ELECTRICAL PLANS FOR

ADDITIONAL DEMOLITION NOTES.

8. SALVAGE ALL UNISTRUT AND PROTECT FOR RE-USE IN NEW CONSTRUCTION, IF

REQUIRED.

9. AT LOCATIONS OF REMOVED WALLS, ALL ASSOCIATED ITEMS ATTACHED TO THE WALL

ARE TO BE REMOVED. SUCH AS: DOORS, WINDOWS, FRAMES, MARKERBOARDS,

TACKBOARDS, TACK STRIPS, ETC.

COMPLETE DEMOLITION

OF EX. ROOF DOWN TO

ROOF DECK

EX. ROOF, CLEAN AND

PREP FOR NEW ROOF

SYSTEM APPLIED ON TOP

COMPLETE DEMOLITION

OF EX. ROOF DOWN TO

ROOF DECK

EX. ROOF, CLEAN AND

PREP FOR NEW ROOF

SYSTEM APPLIED ON TOP

EX. ROOF, CLEAN AND

PREP FOR NEW ROOF

SYSTEM APPLIED ON TOP

EX. ROOF, CLEAN AND

PREP FOR NEW ROOF

SYSTEM APPLIED ON TOP

COMPLETE DEMOLITION

OF EX. ROOF DOWN TO

ROOF DECK

COMPLETE DEMOLITION

OF EX. ROOF DOWN TO

ROOF DECK

E a s t

K a la m a z o o A v e n u e

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M ic h ig a n

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F u lt o n S tr e e t, S u it e

G ra n d R a p id s

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1/16" = 1'-0"

DEMOLITION ROOF PLAN

KEYED NOTES - DEMOLITION

1 REMOVE DEBRIS AND CLEAN EXISTING TPO MEMBRANE AND FLASHING. PREP FOR NEW

MEMBRANE TO BE APPLIED ON TOP OF EXISTING CLEANED MEMBRANE.

2 REMOVE DEBRIS AND CLEAN EXISTING EPDM MEMBRANE AND FLASHING. PREP FOR

NEW MEMBRANE TO BE APPLIED ON TOP OF EXISTING CLEANED MEMBRANE.

3 REMOVE AND DISCARD EXISTING EPDM MEMBRANE, LAYERS OF RIGID INSULATION,

BUILT-UP ROOF SYSTEM, AND FIBER GLASS BOARD DOWN TO THE ROOF DECK. PREP

FOR NEW ROOF MEMBRANE, RIGID, AND TAPERED INSULATION SYSTEM.

4 REMOVE AND DISCARD EXISTING TPO MEMBRANE, LAYERS OF RIGID INSULATION ,

BUILT-UP ROOF SYSTEM, AND FIBER BOARD DOWN TO THE CONCRETE ROOF DECK.

PREP FOR NEW ROOF MEMBRANE, RIGID, AND TAPERED INSULATION SYSTEM.

5 LEAVE EXISTING ROOF SYSTEM, NO WORK

6 REMOVE AND DISCARD EXISTING FLASHING. PREP FOR NEW FLASHING, MATCH EXISTING

COLOR, SIZE, AND STYLE.

AD 111

1 ISOMETRIC ROOF

ISSUED FOR DATE

ADDENDUM 1 SEPTEMBER 09, 2020

SLOPED STRUCTURE

WILL NEED TAPER AT ROOF EDGE

TO DRAINS

FLAT ROOF STRUCTURE

WILL NEED TAPER AT ROOF

EDGES AND TO EXISTING DRAINS

FLAT ROOF STRUCTURE

WILL NEED TAPER AT ROOF EDGE TO DRAINS

FLAT ROOF STRUCTURE

WILL NEED TAPER AT ROOF

EDGES AND TO EXISTING DRAINS

FLAT ROOF STRUCTURE

WILL NEED TAPER AT ROOF

EDGES AND TO EXISTING DRAINS

FLAT ROOF STRUCTURE

WILL NEED TAPER AT ROOF

EDGES AND TO EXISTING DRAINS

FLAT ROOF STRUCTURE

WILL NEED TAPER AT ROOF

EDGES AND TO EXISTING DRAINS

File details come from the government source that posted it. Updated Mar 11, 2026.