2018-743-E AMS - Boomerang Design 510-Waters Assessment

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DocuSign Envelope ID:200BF5BF-439F-4591-A664-7248B1AB5C64 boomerang D E S I G N rethink,repurpose,results October 17, 2018 Mr.Jeff Thompson, Director Asset Management Services Orange County, North Carolina 200 South Cameron Street PO Box 8181 Hillsborough, NC 27278 Dear Jeff: Below, please find our proposal to study, research, and report upon solutions for moisture mitigation at 510 Meadowlands Drive. Final bid drawings and specifications are an additional service.Thank you for thinking of us. Please let me know if you have any questions. Background Orange County has been experiencing high moisture and mold levels in the facility located at 510 Meadowlands Drive in Hillsborough, NC. The County has been working with an Industrial Hygienist to remediate the areas of greatest concern. The County's next step is to study options to bring the building back into acceptable levels by reducing the amount of moisture within the building. The two-story building is comprised of a two-story section of conditioned office space in the front 1/3 of the building with a high-bay single story unconditioned warehouse in the remainder.The existing building has a pre- engineered structure and an exterior single wythe split faced block with banding of painted cmu. The roof insulation is typical metal building wrapped blankets.The wall insulation behind the sheetrock in the conditioned space is expected to be fiberglass batt insulation.The County built a full height 2-hour wall separating the office space from the warehouse space shortly after purchasing the building in 2006. The county installed Mitsubishi Ceiling-Cassettes throughout the conditioned space for HVAC. Building Construction 510 Meadowlands Drive building was constructed with a split faced, single wythe block.The nature of all masonry is that it is porous and absorbs water. Brick, stone, cinder block and split faced block will all absorb water, and the only way to prevent moisture traveling into the interior spaces is to construct multiple wythe walls. Multiple wythe (width) walls are actually two (and sometimes three or four) walls in one. The inner one or two widths are structural and support the building's weight, while the outer wall (sometimes called a veneer wall) does not. Between the inner and outer walls is an air gap, usually about 1"wide. Water will travel in pretty much any direction, based upon gravity, pressure differences, humidity, capillary action and heat gradients, but the one thing that water will not cross is an air gap. This is the biggest issue with split faced block buildings. They were, almost always, built without an air gap as a single wythe walls just like 510 Meadowlands Drive. The problems seen with split faced block buildings have been the result of water intrusion. The symptoms include water stains and bubbling paint on ceilings and walls, warping and buckling hardwood floors, water dripping from exterior wall outlets and light switch boxes, musty smells and mold formation. 6131 Falls of Neuse Road,Suite 204,Raleigh,North Carolina 27609 tel 919.573.6400 fax 919.573.6495 thinkboomerang.com