Attachment_5_-_Q_As_0001.pdf

United States Department of the Interior

National Park Service Minute Man National Historical Park

174 Liberty Street Concord, MA 01742

Roof Replacement Buttrick Cottage House & Buttrick Carriage House

174 Liberty St Concord, MA 01742

RFI Response Q&As

Is there a lead or asbestos report for these buildings?

There is no lead or asbestos report for these buildings.

Please confirm that the existing covered skylights will remain in place.

The skylight will remain intact and in place.

Please confirm if there are any known leaks or rot in the decking?

There are currently no know leaks at this time for both roofs.

Are there any preferred/required vendors?

Replace shingles “in kind” as to color and style. Samples to be submitted for likness.

• Basis of design:

GAF Royal Sovereign 3-Tab Shingles (Weathered Grey)

• Contractors may submit alternatives to the basis of design.

Does the roof have an existing warranty?

The current roof has surpassed any installation and manufactures warranty periods.

Can a Superintendent be dual-hat to cover the SSHO role?

Yes, a jobsite superintendent can also be the Site Safety and Health Officer.

Please confirm that the area must remain open to the public during construction.

Both buildings are not open to the general public, however they are used daily by the park staff and must remain as open through out the project.

Please confirm whether the cupola on either building is to receive new shingles or is excluded from scope.

There is only one cupola in this project, and it is intended to be re-shingled. “Replace roof on louvered vent cupola. Care to be taken to not damage original building elements.”

Can NPS confirm the expected extent (or unit of measure) of chimney stucco repair for estimating purposes?

These are the notes that NPS complied for the purpose of estimating both roofs. Not that the chimneys are ~12 feet in height.

Are contractor shop drawings required for copper cap sleeves or is a standard detail acceptable?

Standard details are acceptable, as are, physical mockups, and mockups of like materials.

Will NPS provide historic-approved samples for matching shingles, stucco, and gutters, or is contractor to submit first?

The selected contractor shall submit samples for approval. The selected contractor will be permitted to take existing physical samples from the buildings to aid in better likeness.

Where is lead-coated copper required versus standard copper or Freedom Gray?

Both roofs have multiple flashing and materials installed in several generations of repairs. For the purpose of estimating NPS took into consideration that there are multiple types of flashing.

For a more cohesive installation of materials, one type may be selected based on location, turnround times, and intent.

Is Douglas Fir the required wood species for in-kind gutter replacement, or are equal hardwoods acceptable?

Douglas Fir has been the preferred material for this application throughout the park, however comparable species can be submitted for review.

Can mockups (e.g., flashing, gutters) be submitted and approved in phases, or must all mockups be reviewed at once?

Mockups can be submitted and reviewed for approval in phases.

Can the government identify designated laydown/staging areas for materials and waste?

The staging that is marked with black hashing on page 2 of the Site Plan document is intended for contractor parking, roll off dumpsters, man lift parking, and material staging. The selected contractor will have free use to stage and work the full perimeter of the buildings for pipe staging, lift use, and general working of the roof.

Will lift or scaffold access to roofs be acceptable? Are there height, weight, or equipment use restrictions?

The selected contractor will have free use to stage and work the full perimeter of the buildings for pipe staging, lift use, and general working of the roof. Both buildings are used daily by the park staff and must remain as open throughout the project. Doorways, including garage and carriage doors are to be accessible at all times by park employees.

Where are the available onsite connections for temporary power and water?

Water and power are available onsite inside of the garage and carriage doors of the Buttrick Carriage house. An exterior garden hose hookup is located on the driveway side of the Buttrick Carriage House as well.

If needed to maintain schedule, will weekend work be permitted with prior approval?

Weekend work will not be permitted for the work in this contract.

Will NPS provide a map of staff work zones or access paths to be maintained during construction?

What is the anticipated timing of Notice to Proceed after contract award?

The Contraction Officer will determine this, in general the process will take 7 days for the Notice to Proceed.

If copper or flashing fabrication lead times exceed 60 days, will an extension be considered?

Time extensions will be considered when materials and fabrications have long lead times.

The specifications mention removing the satellite dish and replacing it with a digital version. Are there any preferences for the replacement regarding model, size, range, or mounting location?

There are no satellite dishes mounted to either roof in this contract. There will not be any new items mounted to these roofs in this contract for the foreseeable future that will need coordination with the selected contractor.

United States Department of the Interior