ASHRAE Journal - July 2012 - 153

iaq applications
it penetrates the roof to serve the RTUs. Water staining below the gas line and evidence of repeated attempts to seal the roof penetration strongly indicated water intrusion during precipitation events (Photo 1). The extent and severity of staining was inconsistent with the presence of fungal growth, and there was no visible mold growth on the ceiling tiles. In the kitchen storeroom, we observed significant discoloration of two ceiling tiles. Viewing the ceiling space, we found that the source of moisture was condensation on the refrigerant lines due to gaps and voids in the insulation. The top side of the ceiling tiles exhibited evidence of water damage and had supported moderate fungal growth (Photo 2). Township personnel reiterated that failure of a water line below the concrete floor resulted in limited flooding of the municipal offices hallway approximately one year prior to our assessment. We pulled back sections of the vinyl wall base, and observed very small areas of limited fungal growth on the lower portions of the drywall finish. To assess the back side of the drywall, we created a series of small inspection openings. The back side of the drywall had supported small areas of mold growth, but there was no visible evidence of water damage to the wood stud framing (Photo 3). Our analysis of samples from these materials confirmed limited growth of common fungal genera, but the impacted area was only a few square inches in size. Our most significant findings pertained to the installation and maintenance of the HVAC equipment. The facility has two rooftop units that serve the assembly room, and four forced-air furnaces located in a mechanical room that serve the remainder of the municipal offices. The RTUs were retrofitted to over-sized roof curbs and appeared to be new; our client confirmed that they had been installed to replace failed units the previous year. We removed a series of access panels to examine the coil and blower within each unit, and were surprised to find that they lacked an air
July 2012

photo 1: Repeated attempts had been made to seal the gas line penetration.

photo 2: Ceiling tile above kitchen storeroom. Refrigerant line sets serve walk-in cooler and freezer.

photo 3: Mold growth on back side of wallboard was limited to a few square inches. filtration system; there were no filters of any type within these systems. We soon realized that the RTUs also lacked outdoor air intakes; there was no sup-

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ASHRAE Journal - July 2012

Table of Contents for the Digital Edition of ASHRAE Journal - July 2012

ASHRAE Journal - July 2012
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
Applying VRF? Don’t Overlook Standard 15
Long-Term Commercial GSHP Performance Part 2: Ground Loops, Pumps, Ventilation Air and Controls
Technology Award Case Studies:
Firm Walks the Talk
Bell Canada’s HQ
Measuring Commercial Building Performance: Protocols for Energy, Water, and Indoor Environmental Quality
Standing Columns
Building Sciences
Advertising Section
Sustainable Products Capabilities
Emerging Technologies
Washington Report
Products
Refrigeration Applications
IAQ Applications
People
Special Products
Classified Advertising
Advertisers Index
ASHRAE Journal - July 2012 - ASHRAE Journal - July 2012
ASHRAE Journal - July 2012 - Cover2
ASHRAE Journal - July 2012 - 1
ASHRAE Journal - July 2012 - 2
ASHRAE Journal - July 2012 - Contents
ASHRAE Journal - July 2012 - Commentary
ASHRAE Journal - July 2012 - 5
ASHRAE Journal - July 2012 - Industry News
ASHRAE Journal - July 2012 - 7
ASHRAE Journal - July 2012 - 8
ASHRAE Journal - July 2012 - 9
ASHRAE Journal - July 2012 - Letters
ASHRAE Journal - July 2012 - 11
ASHRAE Journal - July 2012 - 12
ASHRAE Journal - July 2012 - 13
ASHRAE Journal - July 2012 - 14
ASHRAE Journal - July 2012 - 15
ASHRAE Journal - July 2012 - Meetings and Shows
ASHRAE Journal - July 2012 - 17
ASHRAE Journal - July 2012 - Applying VRF? Don’t Overlook Standard 15
ASHRAE Journal - July 2012 - 19
ASHRAE Journal - July 2012 - 20
ASHRAE Journal - July 2012 - 21
ASHRAE Journal - July 2012 - 22
ASHRAE Journal - July 2012 - 23
ASHRAE Journal - July 2012 - 24
ASHRAE Journal - July 2012 - 25
ASHRAE Journal - July 2012 - Long-Term Commercial GSHP Performance Part 2: Ground Loops, Pumps, Ventilation Air and Controls
ASHRAE Journal - July 2012 - 27
ASHRAE Journal - July 2012 - 28
ASHRAE Journal - July 2012 - 29
ASHRAE Journal - July 2012 - 30
ASHRAE Journal - July 2012 - 31
ASHRAE Journal - July 2012 - 32
ASHRAE Journal - July 2012 - 33
ASHRAE Journal - July 2012 - 34
ASHRAE Journal - July 2012 - 35
ASHRAE Journal - July 2012 - Firm Walks the Talk
ASHRAE Journal - July 2012 - 37
ASHRAE Journal - July 2012 - 38
ASHRAE Journal - July 2012 - 39
ASHRAE Journal - July 2012 - 40
ASHRAE Journal - July 2012 - 41
ASHRAE Journal - July 2012 - Bell Canada’s HQ
ASHRAE Journal - July 2012 - 43
ASHRAE Journal - July 2012 - 44
ASHRAE Journal - July 2012 - 45
ASHRAE Journal - July 2012 - 46
ASHRAE Journal - July 2012 - 47
ASHRAE Journal - July 2012 - Measuring Commercial Building Performance: Protocols for Energy, Water, and Indoor Environmental Quality
ASHRAE Journal - July 2012 - 49
ASHRAE Journal - July 2012 - 50
ASHRAE Journal - July 2012 - 51
ASHRAE Journal - July 2012 - 52
ASHRAE Journal - July 2012 - 53
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ASHRAE Journal - July 2012 - 55
ASHRAE Journal - July 2012 - 56
ASHRAE Journal - July 2012 - 57
ASHRAE Journal - July 2012 - 58
ASHRAE Journal - July 2012 - 59
ASHRAE Journal - July 2012 - Building Sciences
ASHRAE Journal - July 2012 - 61
ASHRAE Journal - July 2012 - 62
ASHRAE Journal - July 2012 - 63
ASHRAE Journal - July 2012 - 64
ASHRAE Journal - July 2012 - 65
ASHRAE Journal - July 2012 - 66
ASHRAE Journal - July 2012 - 67
ASHRAE Journal - July 2012 - 68
ASHRAE Journal - July 2012 - Sustainable Products Capabilities
ASHRAE Journal - July 2012 - 70
ASHRAE Journal - July 2012 - 71
ASHRAE Journal - July 2012 - 72
ASHRAE Journal - July 2012 - 73
ASHRAE Journal - July 2012 - 74
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ASHRAE Journal - July 2012 - 139
ASHRAE Journal - July 2012 - 140
ASHRAE Journal - July 2012 - Emerging Technologies
ASHRAE Journal - July 2012 - 142
ASHRAE Journal - July 2012 - 143
ASHRAE Journal - July 2012 - 144
ASHRAE Journal - July 2012 - 145
ASHRAE Journal - July 2012 - 146
ASHRAE Journal - July 2012 - Washington Report
ASHRAE Journal - July 2012 - Products
ASHRAE Journal - July 2012 - Refrigeration Applications
ASHRAE Journal - July 2012 - IAQ Applications
ASHRAE Journal - July 2012 - 151
ASHRAE Journal - July 2012 - 152
ASHRAE Journal - July 2012 - 153
ASHRAE Journal - July 2012 - 154
ASHRAE Journal - July 2012 - 155
ASHRAE Journal - July 2012 - People
ASHRAE Journal - July 2012 - Special Products
ASHRAE Journal - July 2012 - 158
ASHRAE Journal - July 2012 - Classified Advertising
ASHRAE Journal - July 2012 - Advertisers Index
ASHRAE Journal - July 2012 - Cover3
ASHRAE Journal - July 2012 - Cover4
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