Tower Roof-DCA 2008-11-17-08.ppt

Burnsengineering and construction

groupthe Burns g g

Solutions that build your futureSolutions that build your future.www.burns-group.com

Philadelphia, PA McLean, VA Wilmington, DE Phoenix, AZ Iselin, NJ Chesterfield MO

DCA Terminal BC Tower Roof Replacement


Agenda

• Purpose of Project

• Proposed Work and Improvements• Proposed Work and Improvements

• Construction Activities

• Questions


The Sheward Partnership’s Project Description WALKWAY LEVEL (Exterior)

Problem: Water leaks into the interior ceiling space below the metal grate walkway.

Resolution: Remove grating, water test existing construction to verify leaks. Clean and prep all caulk joints between steel members and mullion panels. Seal all joints and water test to confirm repairs.

JUNCTION LEVEL (Interior)JUNCTION LEVEL (Interior)

Problem: Water leaks into the interior ceiling space below the metal grate walkway.

Resolution: Remove existing ceiling tiles, hardboard closure panels and i ti i l ti i t f i th b t d t t ti E i fexisting insulation prior to performing the above noted water testing. Examine area for

leaks during water testing both prior to and after the water testing. Apply spray on foam insulation, install new hardboard closure panel, paint and then install new ceiling tiles.


The Sheward Partnership’s Project Description PENTHOUSE LEVEL (Exterior – Roof)

Problem: Water leaks into the Air Traffic Controller Operations Area (Cab Level).

Resolution: Remove conduits around the perimeter of the walkway at the baseof the parapet. Remove existing concrete pavers, insulation and roofing. Clean and prep the joint between insulated metal panel and precast concrete parapet. Install fully adhered modified Bitumen roof over new tapered insulation. Flash perimeter parapet with roof membrane. Install metal edge fascia and flash to panel.with roof membrane. Install metal edge fascia and flash to panel.

PENTHOUSE LEVEL (Exterior –Walls)

Problem: Water leaks and air infiltration into the interior Penthouse Attic space

Resolution: Clean and prep all areas around all wall penetrationsincluding AC Units, Fans, Insulated Panels and Steel Roof Panel. Seal all joints.


The Sheward Partnership’s Project Description PENTHOUSE LEVEL (Interior –Ceiling)

Problem: Existing interior coatings are delaminating from ceiling and wall structure surfaces due to the presence of condensation on the existing steel roof structures.

Resolution: Remove all coatings from the exposed steel plate and miscellaneous support members. Apply spray foam insulation to the underside of the steel plate and framing members. Install a gypsum wallboard ceiling below the insulation.insulation.

PENTHOUSE LEVEL (Exterior –Beams, Columns, and Roof)

Problem: Existing coatings are delaminating from the existing exterior Steel Roof Plate, Metal R f P l b d lRoof Panels, beams and columns.

Resolution: Remove all loose coatings down to bare steel or the initial NationalYellow base paint. Prep exposed materials and apply primer and high performance coatings to match the original National Yellow finish.g g


Ph i Pl

Construction ActivitiesPhasing Plan

•Access •Safety

•Safety Policies will be per MWAA’s Safety Manual and OSHA

•Coordination

•The FAA/MWAA will be involved in all progress meetings – meetings TBD – progress meetings will be held on Wednesday mornings.

•Work Hours

•All loading of material and equipment will be done on the weekends – hours of operation will be 2400 to 0500 for nights, and weekends will be the day shift (need to confirm with FAA/MWAA)FAA/MWAA)

•Construction Duration



Construction Activities

•Waterproof at Metal Grate – Catwalk at Walkway Level•Seal Wall Penetrations and Wall Panels at Penthouse Level•Insulate and Paint Roof Panels and Beam/Columns at Attic Level•Insulate and Paint, Roof Panels and Beam/Columns at Attic Level•Roof Replacement at Penthouse Level•Remove AC Units, Frame Opening and Install New Louvers•Install Motor Operated Dampers and New Exhaust Fan•Install Controls and Tie-In to Building Management System (BMS)•Sprinkler System Drain Down and Sprinkler Modifications•Systems Testing and Balancing•Electrical


Remove all L Panels


Insulate Lower Level Windows


Reseal all Joints


Remove Drop Ceiling and Light Fixtures to I l L Wi dInsulate Lower Windows


Paint Steel Plate

Detail view of top of tower. Bare steel must be prepared for application of coating.


Detail view of loose coating and substrate coating of National yellow.


Remove all coating per scope of work. Laboratory analysis for compatibility may allow well adhered coating to remain.


View of flying beams and columns. These should be prepared in the same way. Assume they will be painted in a different color than the top.


Remove Peeling Paint, Relocate S i kl H dSprinkler Heads


View of ceiling section that will receive spray foam insulation. i f i iThere appears to be less interference in this area.


View of ceiling section that will receive spray foam insulation. g p yNote hoist motor (1) that should be removed before starting work.


View of ceiling section that will receive spray foam insulation. Spray foam shall be installed to the bottom of the curved channel (1) but only to the required depth at the cross beams (2).(1), but only to the required depth at the cross beams (2).


View of ceiling section under Roto Dome cover. All loose paint shall be removed for the spray foam installation.


Repair Roof Drains


Existing drains to be checked for leaks from plumbing fractures.


Existing drain ring to be replaced with lower rim to allow drainage from new sloped roof system.


New flashing to extend under existing counterflashing.


Detail view of existing metal coping to be removed at columns. The columns will be flashed with a liquid membrane tied into the MB flashing.


Carefully remove screws & grating to access flashing at panels. Seal at angle iron opening with Eterna Bond (1) and seal angle iron and concrete with reinforced fluid applied coating (2) before recoating concrete.recoating concrete.


Use lead or copper to flash from top of vent (1) over sleeve (2).


View of summary item 1; condition under grating at walkway (EL 193’-10”). What appears to be silicone caulking is not tooled (1) and will not adhere to galvanized metal (2). Caulking should be scraped off flush to metal or removed. EternaBond or Andek Rash Band should be adhered into place using a steel roller. Once set the entire detailRash Band should be adhered into place using a steel roller. Once set the entire detail should be overlaid with a reinforced waterproofing membrane.


Electrical, Communications and Radio

• Antennas, conduit, junction boxes and lightning protection located within the project area will beprotection located within the project area will be temporarily relocated as required by the project phases.

• All items will be permanently reinstalled in their original locations with new hardware and fittings at the completion of constructionthe completion of construction.


Remove Conduit and Lightning Protection f Fl hifrom Flashing


Remove Conduit and Lightning Protection from Steel


Remove Obstruction Light


Remove FAA Equipment and Conduit


Relocate Cabling and Conduit


Remove FAA Cable


Remove Lightning Protection


Remove Conduit from Flashing


View of ceiling section. A careful inventory of items that interfere with spray foam should be made by contractor.


View of ceiling section under Roto Dome cover. Spray foam insulation should be installed to the bottom of the curved channel.


View of ceiling section under Roto Dome cover. Interfering items such as this sprinkler head must be lowered.


Remove conduit from raised perimeter to remove metal coping.


Summary

• Final Design to be complete by:

• All comments and feedback required by:

• Send comments to Zachary Coleman

• Questions ?

Tower Roof-DCA 2008-11-17-08.ppt

Documents