Questions_and_Answers_0002.pdf

Questions and Answers

Plum Orchard Mansion Gutters & Flashing and Davisville Housing Roof Replacement

Cumberland Island National Seashore

140P5426R0025

Transportation and Logistics to Cumberland Island:

The SOW requires the contractor to provide all transportation, labor, materials, and equipment; however, the solicitation does not clearly define available transportation infrastructure. Please clarify:

a. What contractor transportation options are available for personnel, equipment, roofing materials, copper gutters, and construction supplies to Cumberland Island?

Cumberland Island is accessible by water only. The Contractor is responsible for providing and coordinating all transportation required to complete the work, including transportation of personnel, equipment, roofing materials, copper gutters, tools, and construction supplies.

b. Are any Government-owned docks, barges, ferries, staging areas, or storage areas available for contractor use?

Government-owned barges are not available for Contractor use. The NPS does not own or operate the passenger ferry serving Cumberland Island. Any Contractor use of concessioner-operated ferry services shall be arranged directly by the Contractor with the concessioner and shall be at the Contractor's expense.

NPS docks will be available for Contractor use for loading and unloading personnel, equipment, materials, and supplies. Use of NPS docks shall be coordinated with the NPS and shall not interfere with NPS or concessioner operations.

Laydown and temporary material storage areas will be made available to the Contractor at locations designated or approved by the NPS. The Contractor shall coordinate proposed staging, laydown, and storage requirements with the NPS prior to use.

Except for the NPS facilities specifically identified as available for Contractor use, the Contractor shall be responsible for providing and coordinating all transportation, mobilization, and logistics necessary to perform the Work.

c. Are there restrictions on delivery schedules, vessel sizes, loading/unloading operations, or material storage on the island?

Deliveries shall generally be scheduled during regular NPS work hours.

Deliveries that must occur outside of regular work hours due to tidal conditions or other marine access limitations shall be coordinated with the NPS a minimum of 72 hours in advance.

Crew boats greater than 25 feet in length shall not be moored at Government-owned docks.

The NPS does not establish a specific maximum vessel size for barges or other commercial delivery vessels used by the Contractor. Vessel size and configuration shall be appropriate for the waterways, water depths, tidal conditions, currents, docking or landing locations, and other navigational constraints associated with access to Cumberland Island. The Contractor and its marine transportation provider shall be responsible for determining the suitability of vessels used for delivery operations.

Loading and unloading operations shall be coordinated with the NPS and shall not interfere with NPS or concessioner operations. Materials may be temporarily stored in NPS-approved laydown or storage areas. The Contractor shall coordinate the location and use of these areas with the NPS.

d. Is overnight storage of equipment and materials permitted on the island?

Yes

Additional Deteriorated Wood / Differing Site Conditions:

The Davisville roofing SOW identifies approximately eight sheets of deteriorated roof sheathing at Phillips House for replacement but notes that additional deterioration may be discovered. Please clarify:

a. Will replacement of roof sheathing beyond the specified eight sheets be treated as additional work under a contract modification?

Yes. Replacement of roof sheathing beyond the eight (8) sheets currently included in the Scope of Work will be treated as additional work.

Where additional deteriorated or damaged roof sheathing is identified following removal of the existing roofing, the Contractor shall notify the NPS and obtain approval prior to replacement. Additional plywood authorized by the NPS will be compensated at the same unit price established in the Contractor's Cost Schedule for plywood replacement.

The quantity of additional plywood replaced shall be documented and verified by the NPS.

b. How should contractors account for unforeseen roof framing damage, hidden rot, deteriorated decking, or concealed structural deficiencies encountered during construction?

Where additional deteriorated or damaged roof sheathing is identified following removal of the existing roofing, the Contractor shall notify the NPS and obtain approval prior to replacement. Additional plywood authorized by the NPS will be compensated at the same unit price established in the Contractor's Cost Schedule for plywood replacement.

c. Will a unit-price proposal for additional sheathing replacement be requested after award?

No. A unit price for additional roof sheathing replacement is included in the Cost Schedule and shall be provided as part of the Contractor's proposal.

Any roof sheathing replacement required beyond the eight (8) sheets included in the base Scope of Work and authorized by the NPS will be compensated at the unit price established in the Contractor's accepted Cost Schedule.

Standing Seam Metal Roofing System Requirements:

Please provide additional design criteria for the proposed standing seam roofing systems, including:

a. Required panel profile and panel width.

The Government does not require a specific 16-inch or 18-inch standing seam panel width. Either panel width is acceptable provided the proposed roofing system meets all specified wind design, uplift resistance, material, finish, warranty, and manufacturer installation requirements.

The standing seam roofing shall be a concealed-fastener system. Panel profile, seam configuration, panel width, clips, fasteners, and attachment spacing shall be consistent with the manufacturer's tested and approved roofing assembly used to demonstrate compliance with the specified wind and uplift requirements.

Contractor shall submit the proposed panel profile, panel width, and complete tested assembly for Government review and approval.

Contractor shall submit the proposed panel profile, panel width, and complete tested assembly for Government review and approval.

b. Required panel color and finish

Panel color and finish will be established following the Contractor's submission of product information for the standing seam roofing system included in its proposal.

The Contractor shall submit the manufacturer's standard color and finish options for the proposed roofing system for Government review and selection prior to ordering materials.

c. Minimum warranty requirements for roofing materials and finishes.

Provide a minimum 20-year manufacturer-issued Weathertightness Warranty for all standing seam metal roofing systems.

A standard manufacturer paint finish warranty is acceptable provided the warranty is applicable to the project site's coastal marine environment and does not contain exclusions based upon the project's proximity to saltwater or exposure to a coastal marine environment.

Contractor shall submit the proposed manufacturer's Weathertightness Warranty requirements and standard finish warranty for Government review.

d. Whether a specific manufacturer or approved-equal roofing system is preferred.

The Government does not require or prefer a specific roofing manufacturer. The Contractor may propose any standing seam roofing system that meets the material, performance, wind-uplift, finish, installation, and warranty requirements of the Scope of Work and applicable RFI responses.

The proposed roofing system and associated product data shall be submitted for Government review and approval.

Purlin System Design Requirements:

The SOW requires installation of a purlin system over the existing roof but does not provide design parameters. Please clarify:

a. Required purlin size, gauge, and material.

b. Whether delegated design or engineered calculations are required.

c. Whether stamped engineering drawings must be provided.

d. Design wind uplift criteria to be used for pricing and engineering purposes.

The requirement for a purlin system has been deleted from the Scope of Work. Roof panels will be clipped directly to the wood deck in accordance with wind load requirements and the manufacturer’s installation specifications.

Plum Orchard Flashing Quantities:

Please provide the estimated quantity of counterflashing replacement required under Section 3.3 of the Plum Orchard SOW.

a. Total linear feet of flashing replacement.

b. Number of chimney/chase locations requiring replacement.

c. Any available details or dimensions for estimating purposes.

There are seven (7) masonry chimney/chase locations requiring installation of new reglet counterflashing over the existing base flashing.

For estimating purposes, each chimney/chase is approximately 3'-6" by 6'-0". The Contractor may use these approximate dimensions to determine the total counterflashing quantity.

All dimensions and quantities provided by the NPS are approximate and are furnished for estimating purposes only. The Contractor shall be responsible for verifying all dimensions and existing conditions in the field prior to fabrication and installation.

Welded Wire Mesh Quantity Verification:

Please provide the number and dimensions of masonry chase tops requiring removal and replacement of welded wire mesh.

a. Total quantity of chase locations.

b. Approximate dimensions of each chase.

There are seven (7) masonry chimney/chase locations requiring removal and replacement of the welded wire mesh at the tops of the chases.

For estimating purposes, each chimney/chase top is approximately 3'-6" by 6'-0".

All dimensions and quantities provided by the NPS are approximate and are furnished for estimating purposes only. The Contractor shall be responsible for verifying all dimensions and existing conditions in the field prior to fabrication and installation.c. Estimated square footage of replacement mesh.

Historic Preservation Requirements:

Since Plum Orchard Mansion is a historic structure, please clarify:

a. Whether mock-ups, samples, or Government approval of fabricated copper components will be required prior to installation.

b. Whether a Historic Preservation Specialist will review contractor submittals.

c. Whether any additional preservation requirements apply beyond those identified in the

SOW.

Refer to Sections 4, 5, and 6 of the Scope of Work for applicable submittal, material, and historic preservation requirements.

The NPS Cultural Resource Manager may exercise the right to review Contractor submittals, including samples and fabricated components, and may observe work on site during performance of the project.

No additional historic preservation requirements beyond those identified in the Scope of Work and applicable RFI responses are established by this response.

Schedule and Material Staging:

Please clarify:

a. Whether the Government anticipates both project locations being performed concurrently or sequentially.

The Government does not require the two project locations to be performed either concurrently or sequentially. The Contractor may establish the sequencing of the Work based on its proposed means, methods, and schedule, subject to coordination with the NPS.

b. Whether contractor staging areas will be provided at both sites.

Contractor staging and laydown areas will be made available at both project locations. Specific locations and limits of staging areas shall be coordinated with and approved by the NPS prior to use.

c. Whether any seasonal, environmental, wildlife, or visitor-use restrictions could affect construction activities.

The Contractor shall comply with the environmental, cultural resource, wildlife, and visitor-use requirements identified in the Scope of Work and applicable project compliance documents. Construction activities shall be coordinated with the NPS where temporary restrictions or adjustments are necessary to protect park resources, wildlife, visitors, or ongoing NPS operations.

Bid Documents:

Please clarify:

a. No price schedule provided for Davisville Housing Unit Roof Replacement.

Provided in Response.

Question No.

Reference (Sect/Para/Page) STATEMENT/QUESTION GOVERNMENT RESPONSE

1. GENERAL Please confirm if Microsoft Project can be used for the scheduling software on this project?

The Park does not have access to Microsoft Rroject. Any schedules sent to the park shall be exported from Project in a PDF or XLSX format.

2. GENERAL

Does the contractor need to provide temporary restrooms for workers while onsite or can they use the current facility restrooms located on the island?

The contractor can use the existing bathrooms at the facilities.

3. PLUM ORCHARD

GUTTERS SOW

During the site visit, it was mentioned that there was an additional drawing that was missing from the RFP that included wood encased gutter work on the front of the mansion (south side).

Please provide if available so this work can be included in the proposal.

The interior wood gutters have been removed from the Scope of Work.

Amended SOW being issued with the RFI Response.

4. PLUM ORCHARD

GUTTERS SOW

Which hanger does the customer want us to use to support the 8” copper half round gutters? The existing half round copper regal hangers are more than 30” on center and are screwed into the roof deck below the Divinci starter shakes. There is no way to add this type of hanger to the gutters without removing the shales from the top down. The bottom supported brackets only come in sizes up to 6” maximum.

The Government does not require a single specific hanger configuration for the 8-inch half-round copper gutters.

The roofing manufacturer has confirmed that the starter course can be removed and replaced where necessary to facilitate installation of roof-mounted gutter hangers. The manufacturer has also confirmed that the gutter hangers may be installed at the first course above the starter strip. The manufacturer's written response will be included as an attachment to this RFI response. The manufacturer has indicated that they are available to answer technical questions from contractors bidding the project.

Additionally, during market research, the Government identified commercially available vertical fascia-mounted half-round copper gutter hangers suitable for 8-inch half-round gutters.

The Contractor may utilize a roof-mounted or vertical fascia-mounted hanger system, provided the proposed system is compatible with the 8-inch copper half-round gutter, is suitable for the intended exterior coastal application, and meets the spacing and installation requirements of the Scope of Work. The proposed hanger and attachment method shall be submitted for Government review prior to installation.

5. PLUM ORCHARD

GUTTERS SOW

All new gutters need to be painted with oil bases paints. Is there a specific brand or type the customer wants utilized for this application?

Primer: Farwest Paint Rynolite 1029 Primer or approved equivalent.

Top Coat: Farwest #300 series Semi- Glass glkyd enamel or approved equivalent.

6. PLUM ORCHARD

GUTTERS SOW

Is the contractor only required to install wire mesh for the (2) chimney caps noted on the plans?

All masonry chases will require new wire mesh covering. It is clouded to

7. PLUM ORCHARD

GUTTERS SOW

The largest copper half-round gutter is 8”. Is that going to be acceptable for the lower roof area on the west end of the building? Yes.

8. PLUM ORCHARD

GUTTERS SOW

The internal gutter is specifying using epoxy resin to create slope to existing drains. There is no product that I’m aware of you can pour to create a slope. The internal drain is only 3.5” to 4” deep and by adding 1/8” slope, it will be over the top of the gutter on a 32 LF run. The current issue is the internal gutter is not wide or deep enough to handle the water during heavy rainfall. Please advise on how would you like us to proceed on this issue.

The interior wood gutters have been removed from the Scope of Work.

Amended SOW being issued with the RFI Response.

9. PLUM ORCHARD

GUTTERS SOW

Are all the chimney chases (4 sides) to have new copper counterflashing and kerf cuts? Yes.

10. PLUM ORCHARD

GUTTERS SOW

Specifications call for new welded wire mesh at all chimney chases, but the plans say only two. Which one is correct? The plans indicate

11. PLUM ORCHARD

GUTTERS SOW

Can the contractor use the North landing area (Plum Orchard Dock/landing) for equipment and supplies for Plum Orchard?

Yes. Please schedule all landings with the COR at least 24 hours in advance.

12. PLUM ORCHARD

GUTTERS SOW

Can the contractor dock a boat at the Plum Orchard Dock area while working at Plum Orchard. Yes.

13.

PLUM ORCHARD

GUTTERS

(GENERAL)

Can the workers sign in daily at Plum Orchard? The contractor’s employees are not required to sign in on the island.

14. DAVISVILLE

ROOFS SOW

Due to the close proximity of the salt environment Aluminum is the only material that will be eligible for a warranty. Please confirm that the standing seam metal roof is too be an Aluminum panel.

The Scope of Work currently specifies 24-gauge Galvalume-coated steel standing seam roofing panels. The Government will consider substitution of an aluminum standing seam roofing system where necessary to satisfy the specified warranty requirements for the coastal environment. Contractor shall provide manufacturer documentation demonstrating the warranty limitation applicable to the specified Galvalume-coated steel system and shall submit the proposed aluminum roofing system, including panel thickness, finish/coating system, fasteners, clips, accessories, wind-uplift performance, and manufacturer warranty, for Government review and approval. No material substitution is authorized by this RFI response until approved by the Government.

15. DAVISVILLE

ROOFS SOW

Please confirm the color of metal panel to be priced for the standing seam metal roofs (all buildings).

Color is TBD until contractor has Submitted the manufacturer.

16. DAVISVILLE

ROOFS SOW

Does the customer require 16” or 18” wide standing seam roof panels if they meet the required wind ratings and uplift calculations?

The Government does not require a specific 16-inch or 18-inch standing-seam panel width, provided the proposed panel system complies with all specified wind design, uplift resistance, substrate, fastening, finish, warranty, and manufacturer installation requirements. Contractor shall submit the proposed panel width and complete tested assembly for review and approval.

17. DAVISVILLE

ROOFS SOW

The manufacturer is requiring removal of the shingles in order to furnish a Weathertightness Warranty. They want to make sure the existing decking is properly secured to meet current building codes. Please advise if this is acceptable.

The Government will consider removal of the existing asphalt shingle roofing where required by the standing seam roofing system manufacturer as a condition of providing the specified Weathertightness Warranty.

Contractor shall provide written documentation from the proposed roofing system manufacturer confirming that removal of the existing asphalt shingles is required to obtain the specified Weathertightness Warranty.

The documentation shall identify any manufacturer requirements for inspection and verification of the existing roof decking and deck attachment prior to installation of the standing seam roofing system.

Upon receipt and review of the manufacturer's documentation, the Government will amend the Scope of Work, as appropriate, to incorporate removal of the existing asphalt shingles and associated requirements.

Following removal of the existing shingles, the existing roof decking shall be inspected and its attachment verified for compliance with the requirements of the approved roofing system and applicable wind-uplift requirements. Any deteriorated, damaged, inadequately secured, or otherwise deficient roof decking identified following removal shall be brought to the attention of the Government prior to repair or replacement.

No repair or replacement of existing roof decking beyond that currently required by the Scope of Work is authorized without prior Government approval.

18. DAVISVILLE

ROOFS SOW

Is high temperature ice and water-shield acceptable as an underlayment to the existing plywood decking?

High-temperature self-adhering ice and water shield may be utilized as underlayment over the existing plywood roof decking, provided the proposed underlayment is approved by the standing seam roofing system manufacturer for use with the proposed roofing system.

Contractor shall submit the proposed underlayment Product Data Sheet and documentation from the standing seam roofing system manufacturer demonstrating that the underlayment is approved for use beneath the proposed aluminum standing seam roofing panels and is compatible with the manufacturer's Weathertightness Warranty requirements.

Underlayment shall be rated for the temperatures anticipated beneath the metal roofing system and shall be installed in accordance with the underlayment manufacturer's requirements and the requirements of the approved standing seam roofing system.

19. DAVISVILLE

ROOFS SOW

Does the customer want a 20-year watertightness Warranty on all the standing seam metal roofs?

Yes. Provide a minimum 20-year manufacturer-issued Weathertightness Warranty for all standing seam metal roofing systems included in the Scope of Work.

The roofing system, substrate preparation, underlayment, panels, clips, fasteners, flashings, accessories, installation details, and installer qualifications shall comply with the roofing system manufacturer's requirements necessary to obtain the specified warranty.

Contractor shall submit the proposed manufacturer's Weathertightness Warranty requirements and sample warranty for Government review prior to installation.

20. DAVISVILLE

ROOFS SOW Is a standard paint finish warranty acceptable for this project?

A standard manufacturer paint finish warranty is acceptable provided the warranty is applicable to the project site's coastal marine environment.

The finish warranty shall cover the proposed aluminum standing seam roofing panels and shall not contain exclusions based upon the project's proximity to saltwater or exposure to a coastal marine environment.

Contractor shall submit the proposed manufacturer's paint finish warranty for Government review and approval prior to ordering roofing materials.

21. DAVISVILLE

ROOFS SOW

It was noticed during the walkthrough that a good portion of the fascia boards were compromised due to termite damage. Does the replacement of damaged fascia board need to be included in the contractor’s proposal?

The fascia is not included in the Scope for this requirement.

22. DAVISVILLE

ROOFS SOW

For the Phillps and Davis House, can these houses be worked on at the same time or will the contractor only be allowed to replace

(1) roof at a time?

The Phillips House and Davis House roofing work may be performed concurrently. The Contractor is not limited to completing one roof prior to beginning work on the second roof.

The Contractor shall sequence and perform the work so that each structure remains weathertight throughout construction. At the end of each workday, and whenever precipitation or adverse weather is anticipated, all exposed roof areas shall be dried-in and protected from water intrusion. The Contractor shall be responsible for maintaining temporary weather protection until the permanent roofing system is installed and weathertight.

23. DAVISVILLE

ROOFS SOW

Will the contractor have access around the each of the buildings during construction or will there be areas that no access is granted for equipment/trailers?

The Contractor will be permitted reasonable access around each building as necessary to perform the Work. Access shall be limited to areas necessary for construction operations and shall be coordinated with the NPS.

Equipment, trailers, material storage, and staging shall not obstruct established roads, pedestrian access, utilities, or access to adjacent facilities.

The NPS reserves the right to restrict equipment access and staging in areas where necessary to protect existing structures, vegetation, utilities, cultural resources, or other site features.

Contractor shall minimize ground disturbance and damage resulting from construction operations and shall restore areas damaged by its operations.

24. DAVISVILLE

ROOFS SOW

Will the (3) buildings be occupied at any capacity during construction?

The Davis House and Phillips House are currently unoccupied; however, their occupancy status may change prior to or during the period of performance.

The North Cabin is currently occupied by an NPS employee and shall be considered an occupied structure for purposes of planning and performing the Work.

The Contractor shall coordinate construction activities with the NPS and maintain safe access to occupied structures throughout construction. The Contractor shall not assume that the Davis House or Phillips House will remain unoccupied for the entire duration of the Work.

25.

DAVISVILLE

ROOFS /

GENERAL

Where will the contractor be required to sign in daily for the Davisville Roofs replacement portion of this contract? Sign in not required.

26.

DAVISVILLE

ROOFS /

GENERAL

Can the contractor utilize one of the NPS’s docks on the SOUTH end of the island during construction of the Davisville Roofs Replacement?

The Contractor may utilize the NPS dock at the Sea Camp Ranger Station for access to the island in support of the Davisville Roof Replacement project.

The Contractor shall be responsible for providing all marine transportation required for Contractor personnel, equipment, materials, and supplies. Use of the Sea Camp Ranger Station dock shall be coordinated with the NPS and shall not interfere with NPS Ferry operations.

The Contractor will be permitted to stage up to two (2) vehicles at the Sea Camp Ranger Station for the purpose of transporting Contractor personnel between Sea Camp and the Davisville project sites.

Contractor use of the dock, vehicle staging area, and associated access routes shall be coordinated with the NPS throughout the period of performance.

PRINT APPROVED BY:

(SIGNATURE) (DATE)

A SIGNED PRINT APPROVAL SIGNIFIES A CUSTOMER HAS

VERIFIED ALL DIMENSIONS, SIZES, QUANTITIES, AND

MATERIAL TYPES.

FABRICATION WILL PROCEED ONLY AFTER RECEIPT OF

SIGNED PRINT APPROVAL

MATERIAL:

□ .1875" X 1" GALV. STEEL

DATE: ___________________ SHEET ________ OF _______

PROJECT INFORMATION:

(PROJECT NAME)

(ARCHITECT)

(CUSTOMER)

(REPRESENTATIVE/ DISTRIBUTOR)

QUANTITIES:

__________ TOTAL PCS

NOTES:

1. ALL FASTENERS SUPPLIED BY OTHERS.

2. UNLESS OTHERWISE NOTED, FABRICATION OF MITERS AND ACCESSORIES ARE FURNISHED STANDARD USING PRE-PAINTED RIVETS, THEN CAULKED.

HALF ROUND GUTTER SUPPORT

BRACKET - VERTICAL FASCIA

(Wrapped in metal to match gutter)

COLOR:______________________________________________

___" Dia.

BAR STOCK

□ GALV. STEEL

□ ALUMINUM

□ STAINLESS STEEL

□ COPPER

WRAP

□ .1875" X 1" STAINLESS STEEL

1/2"

5/16" Dia. Holes

2 1/4" Min. is

Std or ___"

CL

CL

(FABRICATOR SIGNATURE)

COPPER

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