Category Design Deficiencies - Page 2

12
Nov
OWNER Caution! – Why Ar...
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Comments Off on OWNER Caution! – Why Are Designers Not Aware of CPVC Failures? (Part 2)

This is the second of four posts in a CPVC piping failures series by Donald B. Snell, PE. Causes of CPVC Failures When CPVC failures do occur, most frequently they are due to contamination issues and minor stresses imparted on the pipe. (See article by Duanne Priddy on Why Do PVC & CPVC Pipes Occasionally Fail?.) Contamination issues

29
Oct
OWNER Caution! – Why Ar...
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Comments Off on OWNER Caution! – Why Are Designers Not Aware of CPVC Failures? (Part 1)

This is the first of four posts in a CPVC piping failures series by Donald B. Snell, PE. CPVC Advantages There are many advantages of using Chlorinated Poly (Vinyl Chloride) (CPVC) piping (such as domestic water, condensate drain piping, and fire sprinkler piping) in building systems. These advantages include: Lower cost Ease of installation Physical

17
Sep
Inherent Risks Associated...
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Comments Off on Inherent Risks Associated with Increased Building Exhaust

This is the seventeenth post in a series by J. David Odom (ASHRAE), Richard Scott (AIA/NCARB/LEED AP), and George H. DuBose (CGC). It was first published as a mini-monograph for NCARB (National Council of Architectural Registration Boards). The inherent risks associated with increased building exhaust as recommended in this LEED credit are numerous: It increases

This is the eleventh post in a series by J. David Odom (ASHRAE), Richard Scott (AIA/NCARB/LEED AP), and George H. DuBose (CGC). It was first published as a mini-monograph for NCARB (National Council of Architectural Registration Boards). Intent: Provide additional outdoor air ventilation to improve air quality for improved occupant comfort, well-being, and productivity. For

28
May
The Envelope Design, HVAC...
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Comments Off on The Envelope Design, HVAC Design, and Moisture Problem Equation

This is the ninth post in a series by J. David Odom (ASHRAE), Richard Scott (AIA/NCARB/LEED AP), and George H. DuBose (CGC). It was first published as a mini-monograph for NCARB (National Council of Architectural Registration Boards). It may be only a slight overstatement to state that there is no wall system which a creative

22
Apr
Liberty Building Forensic...
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Comments Off on Liberty Building Forensics Group Completes Expert Witness Work for Pegasus Landings

Here is a press release we sent out recently. Orlando, Florida – 4/23/2014 – Florida-based Liberty Building Forensics Group® (Liberty), a leading building forensics firm that has solved some of the world’s largest and most complex building moisture and mold problems, has recently completed an expert moisture-related consulting project for a building project called Pegasus

This is the fourth post in a series by J. David Odom (ASHRAE), Richard Scott (AIA/NCARB/LEED AP), and George H. DuBose (CGC). It was first published as a mini-monograph for NCARB (National Council of Architectural Registration Boards). Through our evaluation of various LEED credit opportunities for designers, we hope to establish the fact that a

22
Jan
Air Barrier Testing at a...
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Comments Off on Air Barrier Testing at a Tropical Resort, Part 4

By Rick Scott, AIA This is part 4 of 4. Conclusions and Lessons Learned Test findings showed the difficulty of trying to achieve a very tight air barrier installation. While the resort specifications called for a very ambitious whole building air barrier performance target of 0.085 cfm/ft2 at 75 Pa, such numbers are almost meaningless

By Rick Scott, AIA This is part 3 of 4. Results of Air Barrier Testing After the test data was collected, it was analyzed to determine the air leakage rates in cubic feet of air (cfm) per square feet (ft2) of wall surface area. This analysis revealed that the building was leakier than predicted and

13
Dec
Air Barrier Testing at a...
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Comments Off on Air Barrier Testing at a Tropical Resort, Part 2

By Rick Scott, AIA This is part 2 of 4. Air barrier testing was also advocated to make sure the installation was meeting the building envelope air tightness goals set by the design team. One limitation of air barrier testing is that it needs to be performed when the building envelope is substantially complete, since

8
Aug
Looking at a Building’s...
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Comments Off on Looking at a Building’s Genetic Profile

This post by David Odom is part 3 of 3. To the discerning eye, there are remarkable similarities between the biomed and construction fields. The medical community consistently looks for biomarkers in human DNA structure. This helps them to connect the dots between cause and effect. Even as early as the womb, they are able

26
Jun
Building Owners Beware: T...
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Comments Off on Building Owners Beware: The Rooftop Swimming Pool That You Don’t Want (Part 2)

This post by Don Snell is part 2 of 2. Air is uncontrolled when it infiltrates. Air infiltration can be caused by mechanical fan effects or wind pressure. In this case, it was caused by strong negative fan pressure. Roof curb spaces should be maintained at a near-neutral pressure with respect to the outdoors. These,

12
Jun
Building Owners Beware: T...
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Comments Off on Building Owners Beware: The Rooftop Swimming Pool That You Don’t Want (Part 1)

This post by Don Snell is part 1 of 2. It’s not uncommon for mid-rise buildings in warm, humid climates to have rooftop make-up air units to serve the ventilation and pressurization requirements in these buildings. What is uncommon is to unknowingly have the roof curbs of these make-up air units become a swimming pool-size