Building298_Part3_Ch6_B20_Revision.pdf

Repair Building Envelope and Interior Finishes, Building 298 WO # N40085-19-F-6882 Building 298, Cherry Point, North Carolina

PART 3 - CHAPTER 6 - Page 629 6/17/20

B20 EXTERIOR ENCLOSURE

SYSTEM DESCRIPTION

This system consists of the exterior shell of the facility, which includes all vertical and horizontal exterior closure such as exterior walls, exterior windows, and exterior doors. This system excludes roofing (See System B30, Roofing). Include load bearing exterior walls here, and not in System B10, Superstructure. Structural frame elements at exterior such as columns, beams, and spandrels are included in Superstructure, with only the applied exterior finishes (e.g., paint, stucco) being included here.

Finishes to the inside face of walls which are not an integral part of the wall construction will be included in System C30, Interior finishes.

GENERAL SYSTEMS REQUIREMENTS

B2010 EXTERIOR WALLS

Provide cavity wall exterior wall systems composed of the Exterior Closure and Exterior Wall Backup Construction indicated below.

B201001 EXTERIOR CLOSURE

Provide Exterior Closure system as described below.

Provide brick masonry veneer Exterior Closure. Provide brick masonry details consistent with the existing adjacent building materials

B201002 EXTERIOR WALL BACKUP CONSTRUCTION

Provide Exterior Wall Back-up Construction System (back-up systems for Exterior Closure) including [unit masonry wall systems with insulation

B201003 INSULATION & VAPOR RETARDER

Provide continuous insulation, vapor retarder, water-resistive barrier, and air barrier to meet or exceed requirements of project's energy savings requirements as indicated by applicable American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) 90.1 calculations called for in Unified Facilities Criteria (UFC) 1-200-02, High Performance and Sustainable Building Requirements, and meeting minimum building envelope insulation requirements of UFC 3-101-01, Architecture.

Provide a continuous air barrier to control air leakage into, and out of conditioned spaces. The air barrier must encompass all elements of the facility that are exposed to the outside environment or outside environmental conditions such as roof, walls, floors, and compartmentalized unconditioned portions of the facility such as garages, and negatively pressurized spaces. Permanently seal penetrations through the air barrier, joints in the air barrier, adjoining construction, and transitions to different air barrier materials.

Confirm air barrier compliance with Air Barrier Performance Test in RFP Part 4 B20, Exterior Enclosure.

Provide thermal envelope performance testing through infrared thermography in accordance with RFP Part 4. Coordinate thermal imaging testing with air barrier testing construction schedule.

PART 3 - CHAPTER 6 - Page 630 6/17/20

Provide a continuous water resistive barrier in accordance with UFC 3-101- 01, Architecture. The water resistive barrier must resist liquid (bulk) water from being absorbed into the back-up wall assembly if water leaks, penetrates, or seeps past the exterior enclosure cladding system.

Provide a vapor pressure analysis and hygrothermal analysis in accordance with UFC 3-101-01, Architecture. Determine if a moisture barrier/ vapor retarder is required and where it would be located. Include analysis and conclusion in the design analysis for the project, refer to Part 2 Section 01 33 10.05 20, Design Submittal Procedures. If required by the analysis, provide a moisture barrier/ vapor retarder to restrict the flow of moisture through the exterior enclosure.

Provide contract drawings that indicate each exterior enclosure barrier location and the materials that make up the barriers. Detail the following barrier conditions;

1. Typical conditions at wall sections.

2. Barrier treatment at wall openings.

3. Intersections with other exterior enclosure assemblies and materials. Include intersections at roof and floors.

4. Intersections with counter flashing.

5. Inside and outside corners.

6. Preservation of air and water tightness at anchors for materials that cover the barrier.

7. Treatment to seal barrier penetrations such as conduits, pipes, electric boxes, and fixtures.

8. Indicate air barrier perimeter, if facility is segmented into areas that are not within the air barrier envelope.

B201005 EXTERIOR LOUVERS & SCREENS

Provide exterior louvers and screens, where required, that match the finish of the existing windows and detailed to integrate with the architecture of the building, as appropriate to the design of the building.

B201006 BALCONY WALLS & HANDRAILS

Provide balcony walls compatible with the exterior architecture of the building. Provide ornamental railing to harmonize with the existing railing of the existing building.

Handrails and guardrails must be finished to withstand extreme wear conditions.

PART 3 - CHAPTER 6 - Page 631 6/17/20

Provide metal ladders and railings complying with Occupational Safety and Health Administration (OSHA) requirements for access and protection to any exterior mechanical mezzanines or other similar spaces.

B201007 EXTERIOR SOFFITS

Provide exterior soffit system..

B201009 EXTERIOR PAINTING AND COATINGS

Provide field applied exterior coatings for all items that are not prefinished, and to prefinished items when required to provide a color other than a standard prefinished color.

B201010 EXTERIOR JOINT SEALANTS

Provide exterior application of joint sealants to seal joints and prepare for finish material installation.

B2020 EXTERIOR WINDOWS

Provide windows in each area of the building that is regularly occupied, except secure area of Wing B (including rooms B-226, B-227, B-228, B-229,B- 230,B-231, B-232, B233, B-234, B-235, B-236, B-237, B-239 and B-240) or as identified in Part 3, Chapter 5 Room Requirements, to enhance the working environment, without compromising visual acuity and comfort. Exterior windows must be prefinished aluminum .

If approved by the DOR, the sample window may be installed in an opening in a framed wall, and the mock-up may be left during construction as a cut-away of the installation. For masonry walls, install the sample window in the masonry sample panel.

B202001 WINDOWS

Provide aluminum operable windows.

Provide integral insect screens for all operable windows.

Provide a mockup of one combination window unit for the project [to be used for a field mockup test of compliance with American Architectural Manufacturers Association (AAMA) 502 Method A and Method B.

B202002 STOREFRONTS

Provide aluminum storefronts.

B202004 EXTERIOR GLAZING

Provide clear glass insulating glass units type glazing.

B2030 EXTERIOR DOORS

Provide solid door assemblies other than at the main entrance. Exterior doors and frames must be non-corroding prefinished steel.

PART 3 - CHAPTER 6 - Page 632 6/17/20

Provide Extra Heavy Duty Doors -– American National Standards Institute/Steel Door Institute (ANSI/SDI) A250.8, Level 3, physical performance Level A, Model 1.

Provide door glazing that matches the window glazing.

B203001 SOLID DOORS

Provide solid steel door assemblies other than at main storefront/curtainwall entrances including prefinished heavy-duty, non-corroding, insulated doors with frames and hardware.

Provide wood doors with rotary cut hardwood veneers. Edge bands must be wood. Also provide louvers and accessories and wall opening elements such as lintels sills and flashings.

B203002 GLAZED DOORS

Glazed Doors - Provide Exterior Glazed Doors and Entrances System.

including factory-finish aluminum framed door assemblies with insulated, glazing, frames, and hardware compatible with other buildings on the base and wall opening elements such as lintels, sills, through-wall flashings, and joint sealers.

B203008 EXTERIOR DOOR HARDWARE

Provide the services of a certified door hardware consultant to prepare the door hardware schedule.

Provide hardware keying compatible with the existing base-wide keying system.

Provide door hardware finish of satin stainless steel.

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