7.3        Roof Systems

All projects at BWI Marshall and Martin State Airports shall comply with the Department of General Services (DGS) Statewide Roofing Policy and specifications, as well as the following criteria:

A.     Design shall include a 60-year life cycle cost analysis for all new construction projects. Reroofing rehabilitation projects are exempt from this requirement. Any method of analysis is acceptable as long as assumptions include: 1) 20-year life for built-up and modified bitumen roofs, 2) biannual maintenance performed.

B.     If the proposed roofing system has not been previously approved by DGS, consultants shall submit the system to Chief, Project Management Design, DGS Engineering, for review and approval. DGS review time is approximately 14 days.

C.      Based on project specifics, DGS may waive the requirement to install vapor retarders for roof installation and/or replacement projects. DGS shall evaluate the need for vapor retarders on a case-by-case basis. Requests for waivers shall be submitted to Chief, Project Management Design.

D.     All projects shall be specified to insure qualified contractors perform the work. Qualified contractors shall be approved by the manufacturer, have a minimum of 5 years of experience in the installation of roof systems, and meet the following guarantee and warranty requirements:

1.      Provide Manufacturer’s roof warranty, including the following minimum criteria:

a.      Complete coverage of the cost of the labor and materials for repair of leaks due to poor workmanship or materials failure.

b.      Complete systems warranty must include each and every component of the roofing system.

c.      Non-prorated, non-penal sum (no dollar limit), twenty (20) year warranty period.

Note: The use of polyisocyanurate (Iso) insulation, to make up the two layers of insulation (base and tapered layer) needed to achieve a 20-year no dollar limit roof, is no longer allowed unless a ½” cover board is applied. Roof systems in which felts are attached directly to the Iso boards shall be rejected and must be remedied.

d.      Coverage of the cost of removal and replacement of damaged or wet insulation, which is a result of leaks from poor workmanship or failed materials.

e.      No exclusion from coverage for damage to the roof system as a result of wind gusts less than 55 mph.

2.      Submit and provide components required by the roofing system manufacturer for the specific warranty.

3.      At the completion of the work, the contractor shall guarantee in writing to the Maryland Aviation Administration (MDOT MAA) representative that the roofing system, flashing, sheet metal work and all associate components as installed are of the highest quality, weathertight, waterproof and free from defects due to improper or defective materials, and/or workmanship developing under normal wear and tear for a period of five (5) years from the date of final acceptance of all work under this contract. The contractor shall be notified by the MDOT MAA representative of any defective work and shall correct water leaks into the building within forty-eight (48) hours after notification and within ten (10) days for all other defects. Failure of the contractor to correct any defects in the time allowed shall allow the MDOT MAA to contract for repairs and charge the contractor for all costs incurred. All repairs/replacement shall be at no cost to the MDOT MAA.

4.      Evidence shall be submitted to MDOT MAA which verifies that all new or replacement roofing materials conform with applicable Underwriter’s Laboratories listed fire rated roof-ceiling assemblies, where listed assemblies are specified as components of A/E designs for the subject building or are otherwise required by the adopted building or fire codes. Additionally, MDOT MAA will not accept any roofing material that is not a Class “A” roof, listed by Underwriter’s Laboratories or Factory Mutual.

E.      All roofs at BWI Marshall and Martin State Airports shall be color white. Consultant shall coordinate with Resident Architect for exact color requirements.

7.3.1            Rooftop Equipment Installation

Equipment installation such as satellite dishes is prohibited. Only HVAC equipment shall be permitted on rooftops. All rooftop equipment installation shall undergo a Line of Sight study and shall be reviewed and coordinated with MDOT MAA Operations and FAA-ATCT at BWI Marshall.