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Home My WebLink About6.h. Approve Change Order No. 1 - City Hall Roof Replacement � ROSEI�✓IOLINT EXECUTIVE SUMMARY CITY tOUNCIL City Council Meeting: October 7, 2014 AGENDA ITEM: Approve Change Order No. 1 — City Hall AGENDA SECTION: Roof Replacement Consent PREPARED BY: Andrew J. Brotzler, PE, Director of Pu i AGENDA NO. Works / City Engineer �p . . ATTACHMENTS: Recommendation Letter from CNH APPROVED BY: Architects; Change Order 1 RECOMMENDED ACTION: Motion to approve Change Order 1 for the City Hall Roof Replacement BACKGROUND The roofmg contractor has encountered a significant amount of rotted ply�vood and several areas of inadequate and/or ineffective insulation during the roof replacement project. To resolve these issues, they have replaced the rotted pl��vood, replaced the water-damaged batt insulation, and added foam insulation wherever necessary to address air flo�v issues. The attached letter from Quinn Hutson from CNH Architects summarizes the damages and repairs in greater detail. These unexpected issues have resulted in an additional $25,859 being added to the contract, Uringing the new contract amount to $259,859. The additional charges are not covered by the insurance claim and will be paid from the City's operating budget for building repairs. Change Order 1 also extends the complerion deadline fYOm OctobeY 10 to October 24, 2014. SUMMARY Staff recommends Council appro�al of Change Order 1 for the City Hall Roof Replacement. G:APublic�Xlurks\Storm llamage\2013,August G\20141UU7 CC Change Order 1.doc� 7300 WEST 147T"STREET SUITE 504 APPLE VALLEY, MN 55124-7580 (952) 431 -4433 � � October 1, 2014 Mr. Andy Brotzler City of Rosemount 2875 145th Street West Rosemount, MN 55068-4997 Re: Rosemount City Hall Roof Replacement Review of Change Order#1 CNH No.: 14017 Mr. Brotzler: The following is a summary review of added costs and construction time associated with Change Order#1 for the City Hall Roof Replacement project. All of these changes have been reviewed by CNH Architects and with City of Rosemount staff as they were identified. My goal in this review is to summarize these in a single document. All items listed below were in concealed areas that were not able to be investigated prior to roofing or facia removal. Item #1 —Insulation over Upper Level Vestibule Doors When opening the facia in the area over the upper level exterior vestibule doors it was discovered that the stud header ��all ��as exposcd batt ins�ilation ��ithout exterior sheathing, see photo below. ° :<�,� ,;ry.�, u-P�; ' �� a� , ,. _ _ _ . . . � � ..�;. , �� M r� ��;� �t� ° `�'� _ � � �� ...,,. . > � „ . � r:.. "�v$4' % ..,, � ..... � ".4�..`.. � . "�".+.� .�p.= ._a '�+'� � ,t�5`" ' .... �s �;�*'.?M%�l,� . . � ; � �`� : ;��; � � � This exposed batt insulation in a vented soffit was not only unexpected, but not a standard construction practice. Not only does it provide poor insulation, it also would allow for condensation on the back side of the interior gypsum board wall. Due to this, CNH Architects recommended P�.\Projects\2014\14017�5-Constructwn Adrtun�.Correspondence�l.et�er01 Change Order#01 OvercieH�.doc adding spray foam insulation over the exposed batt insulation. This will not only seal the air flow gaps, add insulation R-value, but will act as a vapor barrier for this insulation. Item #2—Water Dama�ed Existin� Roof Deckin�and Insulation Water damage was discovered under the existing standing seam roof at the original portion of City Hall at the eave portions of both the east and west roof slopes. Over the years water had infiltrated at the upper window areas and at the internal gutter locations over each of the two entries. It was known that there had been leaking in these areas from water dripping inside the building or at soffit areas, but until the roofing was removed the condition of the plywood decking and rigid insulation could not be determined or quantified. Upon opening up these portions of the roof it was immediately evident that significant deterioration had occurred covering over I,200 square feet of the existing roof. This water damage was �articularly evident in the crumblin� Iv�vood sheathing shown in the photo below. _ ,. - - . -,�� K .. '�';.,x ,,<�s !s. ,.,.� �.. ., . '.'�� -4 ;,��'r ,�,_. . t. ,.,� + ,yih,` w,^ �� n �¢x, °*�r^ � � -� 4 ��yy� ��Gw.,'^�y,�}�.,,. _ �:'Y^�. -� � �"�::: ',,,� �` •- . _ ��"• � ��, . _x � �~�? .. ,�'�y ��°* �, . � � � fi � *�:�. �, . �um.�Sw,l�� . .�� ,. ,�a..�'1 'jl��r ti� v 0 r •,fs -s >, t�,;r. `�+'� i .\� �y��:� � 5`°,0�:�. *�� .w�*.,;YC�'�+�^^'�'. r'r 'p►�� ,e��",�r. 4 �,,'y aY � v 1 � � ^y, � �, �.,�„�-s �� .��y��'��.. �... �.��'�--�;��,,�,�?�;��., }:��-_ � � � �',,, �� '„ °�. t�►a,,.z 7'. , ,,;v .��. ±,�,�.�.. �,�,�,�° ,.,� .,� � �P� � �� `y, ��' �, � ` � �`�" . , " �;:d�;�' ; With the amount ofwater intrusion evidenced bythe water damaged plywood,CNH Architects was not surprised to find that the Styrofoam insulation below the plywood was soaked with water. This type of insulation is open-celled absorbing moisture into its structure and holding it there. CNH Architects recommended replacing both the plywood and the wet insulation for structural integrity and to restore the intended R-value lost with the wet insulation. In addition,wet insulation left in the roof system would void the new roof system warranty. ltem #3 —Added Spray Foam Insulation at Wall to Deck Areas The last item is areas along most facias were the wall to roof deck construction was not built to match the detailing on the construction documents resulting in additional areas where spray foam insulation was recommended to be installed to prevent heatloss directly from the building interioc to the vented soffit areas. P�.�PrqecU\?014\14017\5-ConsVUCtion Adrtun\Correspondznce\Letter0l Change Order#01 Overciew.doc One of the most notable areas of this is shown in the picture below which is inside the west facia constructio»at the north addition area. The photo shows that the yellow sheathing does not extend up to the roof decking per the original construction, but instead leaves the full stud area open with just some batt insulation stuffed in the gap (batt insulation not visible). � � , � � � �,�. � �.. � �, $�.K_ �� ;- � �, �� CNH Architects recommended installing spray foam insulation into this top of wall conditions,again for both preventing heatloss through the gap as well as prevent moisture issues from condensation. Altogether there were over 500 lineal feet of added spray foam insulation within soffit areas, all of which was only accessible to be installed during this reroofing project. Chan�e Order Value and Time Extension John A. Dalsin& Son, Inc.,the general contractor for this project,submitted costs for the work listed above which was reviewed by CNH Architects and found to be acceptable for the type and quantity of work performed. This extra work not only resulted added time to complete the work, but also caused small delays while the areas were reviewed and a direction was provided. Altogether CNH Architects has determined that approximately 10 �vork days were added based on this additional work (this represents 14 calendar days). P-\Pro�ects�2014U401 TS-Construc�ion Adinin\Correspondence�l.etter-01 Change Order MOl O�erview doc In conclusion,the work shown above will restore the structural integrity of water damaged areas of the existing roof and provide a complete thermal and air barrier between the interior of the building and the exterior soffits. The items discovered were not visible or discoverable during design or by the contractor during bidding. Finally,upon review of the costs and time extension CNH Architects recommends the approval of the attached Change Order#1. Sincerely, �_ i Quinn S. Hutson, AIA, LEED AP Principal CNH Architects, Inc. P:V'rojects�2014U401T5-Construction Adimn\Correspondence\Lzlterv0l Change Order r�01 Ocen�itw.doc 0 5��/1 TM =�_= Document G701 - 2001 Change Order PROJECT(Name and address�: CHANGE ORDER NUMBER:001 OWNER:❑ Rosemount City Hall Roof Replacement DATE:October l,2014 ARCHITECT:❑ 2875 145th Street W Rosemount,MN 5�068 CONTRACTOR:❑ TO CONTRACTOR(1Vame and address): ARCHITECT'S PROJECT NUMBER: 14017 FIELD:❑ John A. Dalsin&Son,Inc. CONTRACT DATE:August 08.2014 2830 South 20th Avenue CONTRACT FOR:General Construction OTHER:❑ Minneapolis,MN 55407 THE CONTRACT IS CHANGED AS FOLLOWS: (Inelude,where applieable,any undisputed nmount attributable to previously exeeuted Constri�ction Change Directives) PR#1,CR#1 East:Vestibule extra sprayfoam. Add$862.00 CR#2 East:Ply and insulation. Add$5,917.00 CR#3 East:Wet ply and insulation replacement. Add$2,024.00 CR#3 West:Temp protection of wet areas. Add$1,214.00 CR#3 West:Wet ply and insulation replacement. Add$7,537.00 CR#3 Additional spray foam wark. Add$8,305.00 The original Contract Sum was $ 234,000.00 The net change by previously authorized Change Orders $ 0.00 The Contract Sum prior to this Change Order was $ 234,000.00 The Contract Sum will be increased by this Change Order in the amount of $ 2�,8�9.00 The new Contract Sum including this Change Order will be $ 2�9,8�9.00 The Contract Time will be increased by Fourteen(14)days. The date of Substantial Completion as of the date of this Change Order therefore is October 24,2014. NOTE:This Change Order dces not include changes in the Contract Sum,Contract Time or Guaranteed Maximum Price which have been authorized by Construction Change Directive until the cost and time have been agreed upon by both the Owner and Contractor, in which case a Change Order is executed to supersede the Construction Change Directive. NOT VALID UNTIL SIGNED BY THE ARCHITECT, CONTRACTOR AND OWNER. CNH Architects,Ine. John A. Dalsin c& Son,Inc. City of Rosemount ARCHITECT(Firm name) CONTRACTOR(Firm nnme) OWNER(Firnz name� 7300 West 147th Street,Suite 504, 2830 South 20th Avenue, 2875 14�th Street W, Apple Valley, MN 55124 Minneapolis,MN 55407 Rosemount,MN 55068 ADDRESS ADDRESS ADDRESS BY(Signnti�re) BY(Signati�re) BY(Signntzrre) Quinn Hutson (Typed name) (Typed name) (Typed name) DATE DATE DATE AIA Document G701 T"'—2001.Copyright OO 1979,1987,2000 and 2001 by The American Institute of Architects.All rights reserved.WARNING Th�s AlA Document is protected by U.S.Copynght Law and intemational Treaties.Unauthorized reproduc[ion or distribution ot this AIA Document,or any .� portion ot it may result in severe civil and criminal penalties.and will be prosecuted to the maximum extent possible under the law This documentwas produced by AIA software at 15:07:51 on 10/01/2014 under Order No.7178443584_1 which expires on 01/16/2015,and is not for resale. User Notes: (726563138)