MOLD & MILDEW CORRECTIVE ACTIONS VOLAR Barracks Rehabs Ft. Polk & Ft. Hood Jack Osborne, P.E. Fort Worth District Corps of Engineers
Scope: OVERVIEW Ft. Polk (awarded Jan 09) Remodel 16 VOLAR Style Barracks (~575,000 SF) Upgrade 4 CEP s and replace distribution systems Correct Surface and Storm Drainage Ft. Hood (est. award date 15-Sep-09) Remodel 11 VOLAR Style Barracks (~250,000 SF) Upgrade 1 CEP and replace distribution system Site improvements Primary Focus: Eliminating sources of Mold and Mildew Growth Total Project Values: Polk (~$200M) Hood (~$80M) Contracting ti Method: Best Value Design-Build ild RFP
Ft. Hood Ft. Polk
WHAT CAUSES MOLD? Food Source Carbon-based Substances (paper, wood, etc) Water Source Building Envelop Water Leaks Infiltration of humid air Piping leaks Showering, Cooking, Laundry Condensation on surfaces Mold Spores (which are ubiquitous) 48 Once a leak occurs mold begins to grow in hours.
TEAM Fort Polk/Hood DPW Planners, energy engineers, PM IMCOM Fort Worth District Mechanical, Electrical, Structural, Civil, Environmental and Construction Engineers, Architect, Interior Designer, PM, AM and Estimators, ERDC-CERL Research, Energy Engineers, System Specialist Consultants Forensic Engineer Expert on Building Leakage Testing Mold and Mildew Prevention
SYSTEMIC PROBLEMS Failing of seals at the windows and doors
Exterior Walls Drill tip showing wetted material entering 8 concrete block Perlite in cavity compacted, causing water buildup.
Exterior Wall Issues (Polk) Building envelope damage
Vinyl Wall Covering (example from Fort Sill)
Drainage Issues
SYSTEMIC PROBLEMS Poor Control of Chilled Water temperatures Envelop vapor barrier on interior side Fan-Coil Units located above the ceiling Laundry Rooms Food sources Flooded Crawl Spaces due to poor drainage
SOLUTIONS Envelop EIFS finish Close-in the open Breezeways & Stairways New Windows (fixed) Blower door testing to verify leakage rate Crawl Spaces Re-grade exterior Natural ventilation Crawl spaces sloped to center drain and covered with vapor membrane and mud slab
HVAC SYSTEMS SOLUTIONS Central Energy Plant (CEP) Chillers capable of providing consistent water supply temp New Distribution System State-of-the-art Control Systems Dorm Fan-Coil Units 4-Pipe Fan Rooms Controls (control sensible load only) Air Distribution Dedicated Outside Air Unit (DOAS) Quantity to offset exhaust air flow and provide slight building pressurization
Other Items Mold Resistant Products SOLUTIONS Gypsum board paper, joint tape and compound Green board on bathroom walls Paint Interior surfaces of exterior walls provided with permeable finish Air Supply Diffusers selected that DO NOT discharge on to a wall or ceiling surface Laundry Rooms decoupled from other HVAC systems Blower Door Testing to verify Leakage rate
Energy Saving Features CEP w/ high efficiency chillers, variable speed pumps and cooling tower fans, etc Heat recovery from exhaust air High Performance windows Closed in breezeway and stairways Lower Humidity levels increase comfort at higher temperatures Energy Star equipment Meet EPAct 05 LEED-NC Silver