ASHRAE Journal - May 2011 - 60

building sciences

Photo 2 (above): Bathtub on Exterior Wall. The classic “Joe Hole”—a hole so big even I can crawl through it. It needs to be draftstopped with something rigid and airtight. Note to folks out there in the real world: fluffy insulation is not rigid and airtight. But a sheet of OSB or gypsum board over fluffy insulation makes the fluffy insulation happy and Joe happy. Photo 3 (top right): Fireplace on Exterior Wall. OK, an even bigger hole than the bathtub hole. Kind of makes it funny to think about sealing an electrical wire going through a top plate when you have something this big. Photo 4 (right): Soffit on Exterior Wall. Wow, this allows for connecting your entire floor cavity to the outside.

they are not always necessary despite what folks say. What they are not is a quality assurance thing. The difference is important. Quality assurance is figuring out what the right thing to do is; quality control is doing it. For example, the right thing to do is to “build tight and ventilate right.” Blower doors can help measure the “tight” part. They cannot measure the “ventilate right” part. To me, the ventilate right part is easy: put in a ventilation system and pick a rate.4 A ventilation system is more reliable than any other approach—such as building a leaky building with random uncontrolled holes. And in terms of the rate, let the people in the house pick the rate much like we do with letting people pick a temperature. We give them a system that can satisfy a range of conditions, and then we give them control of the thermostat. I say we do the same with a ventilation stat. So how tight should we go? Depends on who you ask and whether or not they are crazy.5

Back in the day, when I was young and didn’t know what I didn’t know and what I could never know,6 I was asked to establish airtightness limits and create a ventilation standard for new, to be constructed, energy-efficient houses in Canada. I was supposed to put something together called the R-2000 Program. The year was 1982. Where to start? Easy. Ask someone who knows more than you. Back then, everyone knew more than me. I went to the National Research Council of Canada and ran into folks with names like Handegord, Wilson, Baker, Tamura, Shaw, Bomberg, among others. They said: “interesting that you ask, we have been measuring things and talking to the Swedes who not only are measuring things, but they have actually got something called a “code” for this kind of stuff. It seems that most new houses with basements that we have measured in Canada (and that some other folks have been measuring in the northern U.S.) are around five to seven air changes per hour at a 50 Pa air pressure difference (ach@50Pa) when tested with

4. Our approach is to design and install a controlled ventilation system that is capable of ventilating at 1.5 times the current ASHRAE Standard 62.2 recommended rate, commissioning the system at 60% of the current ASHRAE Standard 62.2 recommended rate and giving control of the ventilation system to the occupant and telling them they can turn it up, turn it down or turn it off. They are responsible for their own environment. This personal responsibility thing is big with us. Of course, there are folks who want to control your thermostat, and folks who are going to want to control your ventilation stat. I say, we hunt these people down and get them out of the gene pool. Just my opinion, mind you. Apparently, elections have consequences. Before I get a zillion comments, I know it is not quite the same. Most of us know that there is a safe range for temperature: don’t turn off the heat completely as things will freeze. Also, most of us can sense temperature; we know when it is too hot and when it is too cold. Ventilation is a little bit different. It can be argued that most people don’t know when they have enough ventilation or when they have too little. I like ranges. A range of ventilation rates that fit between the bookends of too much and too little. We can set the “bookends” from a policy perspective and then get out of folks’ way. 5. Disclaimer here: I know that I am crazy. 6. A sort of Rumsfeldism. It will be interesting to see how history treats him in 50 years time—and his boss, too.

60

ASHRAE Journal

ashrae.org

May 2011



ASHRAE Journal - May 2011

Table of Contents for the Digital Edition of ASHRAE Journal - May 2011

ASHRAE Journal - May 2011
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
Seismic Restraint
Plug Load Design Factors
Technology Award Case Studies:
State-of-Art School
Green School Lab
Eco-Friendly, Affordable, School
Building Sciences
Special Section
InfoCenter
Solar NZEB Project
Emerging Technologies
IAQ Applications
Washington Report
International Column
Products
People
Classified Advertising
Advertisers Index
ASHRAE Journal - May 2011 - Intro
ASHRAE Journal - May 2011 - ASHRAE Journal - May 2011
ASHRAE Journal - May 2011 - Cover2
ASHRAE Journal - May 2011 - 1
ASHRAE Journal - May 2011 - 2
ASHRAE Journal - May 2011 - Contents
ASHRAE Journal - May 2011 - Commentary
ASHRAE Journal - May 2011 - 5
ASHRAE Journal - May 2011 - Industry News
ASHRAE Journal - May 2011 - 7
ASHRAE Journal - May 2011 - 8
ASHRAE Journal - May 2011 - 9
ASHRAE Journal - May 2011 - 10
ASHRAE Journal - May 2011 - 11
ASHRAE Journal - May 2011 - 12
ASHRAE Journal - May 2011 - 13
ASHRAE Journal - May 2011 - Letters
ASHRAE Journal - May 2011 - 15
ASHRAE Journal - May 2011 - 16
ASHRAE Journal - May 2011 - 16a
ASHRAE Journal - May 2011 - 16b
ASHRAE Journal - May 2011 - 17
ASHRAE Journal - May 2011 - Meetings and Shows
ASHRAE Journal - May 2011 - 19
ASHRAE Journal - May 2011 - Seismic Restraint
ASHRAE Journal - May 2011 - 21
ASHRAE Journal - May 2011 - 22
ASHRAE Journal - May 2011 - 23
ASHRAE Journal - May 2011 - 24
ASHRAE Journal - May 2011 - 25
ASHRAE Journal - May 2011 - 26
ASHRAE Journal - May 2011 - 27
ASHRAE Journal - May 2011 - 28
ASHRAE Journal - May 2011 - 29
ASHRAE Journal - May 2011 - Plug Load Design Factors
ASHRAE Journal - May 2011 - 31
ASHRAE Journal - May 2011 - 32
ASHRAE Journal - May 2011 - 33
ASHRAE Journal - May 2011 - 34
ASHRAE Journal - May 2011 - 35
ASHRAE Journal - May 2011 - State-of-Art School
ASHRAE Journal - May 2011 - 37
ASHRAE Journal - May 2011 - 38
ASHRAE Journal - May 2011 - 39
ASHRAE Journal - May 2011 - 40
ASHRAE Journal - May 2011 - 41
ASHRAE Journal - May 2011 - 42
ASHRAE Journal - May 2011 - 43
ASHRAE Journal - May 2011 - Green School Lab
ASHRAE Journal - May 2011 - 45
ASHRAE Journal - May 2011 - 46
ASHRAE Journal - May 2011 - 47
ASHRAE Journal - May 2011 - 48
ASHRAE Journal - May 2011 - 49
ASHRAE Journal - May 2011 - 50
ASHRAE Journal - May 2011 - 51
ASHRAE Journal - May 2011 - Eco-Friendly, Affordable, School
ASHRAE Journal - May 2011 - 53
ASHRAE Journal - May 2011 - 54
ASHRAE Journal - May 2011 - 55
ASHRAE Journal - May 2011 - 56
ASHRAE Journal - May 2011 - 57
ASHRAE Journal - May 2011 - Building Sciences
ASHRAE Journal - May 2011 - 59
ASHRAE Journal - May 2011 - 60
ASHRAE Journal - May 2011 - 61
ASHRAE Journal - May 2011 - 62
ASHRAE Journal - May 2011 - 63
ASHRAE Journal - May 2011 - 64
ASHRAE Journal - May 2011 - 65
ASHRAE Journal - May 2011 - 66
ASHRAE Journal - May 2011 - 67
ASHRAE Journal - May 2011 - InfoCenter
ASHRAE Journal - May 2011 - 69
ASHRAE Journal - May 2011 - 70
ASHRAE Journal - May 2011 - 71
ASHRAE Journal - May 2011 - 72
ASHRAE Journal - May 2011 - 73
ASHRAE Journal - May 2011 - 74
ASHRAE Journal - May 2011 - 75
ASHRAE Journal - May 2011 - 76
ASHRAE Journal - May 2011 - 77
ASHRAE Journal - May 2011 - Solar NZEB Project
ASHRAE Journal - May 2011 - 79
ASHRAE Journal - May 2011 - 80
ASHRAE Journal - May 2011 - 81
ASHRAE Journal - May 2011 - 82
ASHRAE Journal - May 2011 - 83
ASHRAE Journal - May 2011 - 84
ASHRAE Journal - May 2011 - 85
ASHRAE Journal - May 2011 - 86
ASHRAE Journal - May 2011 - 87
ASHRAE Journal - May 2011 - 88
ASHRAE Journal - May 2011 - 89
ASHRAE Journal - May 2011 - Emerging Technologies
ASHRAE Journal - May 2011 - 91
ASHRAE Journal - May 2011 - 92
ASHRAE Journal - May 2011 - 93
ASHRAE Journal - May 2011 - 94
ASHRAE Journal - May 2011 - 95
ASHRAE Journal - May 2011 - IAQ Applications
ASHRAE Journal - May 2011 - 97
ASHRAE Journal - May 2011 - 98
ASHRAE Journal - May 2011 - 99
ASHRAE Journal - May 2011 - 100
ASHRAE Journal - May 2011 - 101
ASHRAE Journal - May 2011 - Washington Report
ASHRAE Journal - May 2011 - 103
ASHRAE Journal - May 2011 - International Column
ASHRAE Journal - May 2011 - 105
ASHRAE Journal - May 2011 - 106
ASHRAE Journal - May 2011 - Products
ASHRAE Journal - May 2011 - 108
ASHRAE Journal - May 2011 - People
ASHRAE Journal - May 2011 - Classified Advertising
ASHRAE Journal - May 2011 - 111
ASHRAE Journal - May 2011 - Advertisers Index
ASHRAE Journal - May 2011 - Cover3
ASHRAE Journal - May 2011 - Cover4
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