ASHRAE Journal - August 2012 - 62
building sciences
don’t do ugly Things
S
by Joseph W. lstiburek, Ph.d., P.eng., Fellow ASHRAE
Over-Roofing
eventeen years ago we bought an old house—a fixer upper—over a hundred years old—in Westford, Mass. I was going to make
Photo 1: Original Roof. Uninsulated rafter framing with board roof deck. Furring straightens out rafter plane for smooth plaster finish. Yes, skylights went in. Yes, they are big thermal holes. But a space needs to be a space or what is the point? It took us many millennia to get out of caves. Kind of dumb to build one on the top of your house. Let the light shine in. Dormers were considered, but we didn’t want to change the appearance that drastically. over-roof and do what I planned originally before I ran out of money and time and thought I could get away with doing only half the job.
sure it would end up energy efficient. Did the rubble foundation thing well—very well—so well that I wouldn’t change a thing if I did it again today. Wrote about it already (ASHRAE Journal, March 2010).
Did the attached barn—not particularly well—and ended up redoing it. Wrote about it (ASHRAE Journal, October 2011). Took the heat (pun intended) from the folks in the peanut gallery after I wrote about it—deservedly so—but you have to talk about the good and the bad—and worse than the bad, the embarrassing. I beat the ants, but it took a long time. Did the roof thing—unvented with spray foam. The roof thing was passable,
but not great. Knew it when I did it that it was not great, but that I would eventually get around to it in a couple of years and change it from passable to great. Actually, it wasn’t even passable. I had to do a quick fix. Read on. Well one thing led to another and another, and a couple of years turned into a decade. And still nothing. The quick fix was tolerable, and the pressure was off. Finally, when the shingles gave out, 17 years later, it was time. It was time to
Photo 2: Rafter Cavity Insulation. High density spray polyurethane foam fills rafter cavity (2 lb/ft3 [32 kg/m3] density).
62 ASHRAE Journal
Photo 3: Finished Roof Back Then. Looked pretty good seventeen years ago. New shingles were installed over a fully adhered membrane applied directly to the original roof decking.
ashrae.org August 2012
ASHRAE Journal - August 2012
Table of Contents for the Digital Edition of ASHRAE Journal - August 2012
ASHRAE Journal - August 2012
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
2012– 13 Presidential Address: Broadening ASHRAE’s Horizons
Improving Energy Performance of NYC’s Existing Office Buildings
How 90.1-2010 Will Affect Health-Care Facilities
Technology Award Case Studies:
Ventilation for Museum
Sustainability at the Y
Standing Columns
Building Sciences
Special Section
InfoCenter
Emerging Technologies
Products
Refrigeration Applications
IAQ Applications
Washington Report
Special Products
Classified Advertising
Advertisers Index
ASHRAE Journal - August 2012 - ASHRAE Journal - August 2012
ASHRAE Journal - August 2012 - Cover2
ASHRAE Journal - August 2012 - 1
ASHRAE Journal - August 2012 - 2
ASHRAE Journal - August 2012 - Contents
ASHRAE Journal - August 2012 - Commentary
ASHRAE Journal - August 2012 - 5
ASHRAE Journal - August 2012 - Industry News
ASHRAE Journal - August 2012 - 7
ASHRAE Journal - August 2012 - Letters
ASHRAE Journal - August 2012 - 9
ASHRAE Journal - August 2012 - 10
ASHRAE Journal - August 2012 - 11
ASHRAE Journal - August 2012 - 12
ASHRAE Journal - August 2012 - 13
ASHRAE Journal - August 2012 - Meetings and Shows
ASHRAE Journal - August 2012 - 15
ASHRAE Journal - August 2012 - 2012– 13 Presidential Address: Broadening ASHRAE’s Horizons
ASHRAE Journal - August 2012 - 17
ASHRAE Journal - August 2012 - 18
ASHRAE Journal - August 2012 - 19
ASHRAE Journal - August 2012 - 20
ASHRAE Journal - August 2012 - 21
ASHRAE Journal - August 2012 - 22
ASHRAE Journal - August 2012 - 23
ASHRAE Journal - August 2012 - 24
ASHRAE Journal - August 2012 - 25
ASHRAE Journal - August 2012 - 26
ASHRAE Journal - August 2012 - 27
ASHRAE Journal - August 2012 - Improving Energy Performance of NYC’s Existing Office Buildings
ASHRAE Journal - August 2012 - 29
ASHRAE Journal - August 2012 - 30
ASHRAE Journal - August 2012 - 31
ASHRAE Journal - August 2012 - 32
ASHRAE Journal - August 2012 - 33
ASHRAE Journal - August 2012 - 34
ASHRAE Journal - August 2012 - 35
ASHRAE Journal - August 2012 - 36
ASHRAE Journal - August 2012 - 37
ASHRAE Journal - August 2012 - 38
ASHRAE Journal - August 2012 - 39
ASHRAE Journal - August 2012 - How 90.1-2010 Will Affect Health-Care Facilities
ASHRAE Journal - August 2012 - 41
ASHRAE Journal - August 2012 - 42
ASHRAE Journal - August 2012 - 43
ASHRAE Journal - August 2012 - 44
ASHRAE Journal - August 2012 - 45
ASHRAE Journal - August 2012 - 46
ASHRAE Journal - August 2012 - 47
ASHRAE Journal - August 2012 - 48
ASHRAE Journal - August 2012 - 49
ASHRAE Journal - August 2012 - 50
ASHRAE Journal - August 2012 - 51
ASHRAE Journal - August 2012 - Ventilation for Museum
ASHRAE Journal - August 2012 - 53
ASHRAE Journal - August 2012 - 54
ASHRAE Journal - August 2012 - 55
ASHRAE Journal - August 2012 - Sustainability at the Y
ASHRAE Journal - August 2012 - 57
ASHRAE Journal - August 2012 - 58
ASHRAE Journal - August 2012 - 59
ASHRAE Journal - August 2012 - 60
ASHRAE Journal - August 2012 - 61
ASHRAE Journal - August 2012 - Building Sciences
ASHRAE Journal - August 2012 - 63
ASHRAE Journal - August 2012 - 64
ASHRAE Journal - August 2012 - 65
ASHRAE Journal - August 2012 - 66
ASHRAE Journal - August 2012 - 67
ASHRAE Journal - August 2012 - InfoCenter
ASHRAE Journal - August 2012 - 69
ASHRAE Journal - August 2012 - 70
ASHRAE Journal - August 2012 - 71
ASHRAE Journal - August 2012 - 72
ASHRAE Journal - August 2012 - 73
ASHRAE Journal - August 2012 - 74
ASHRAE Journal - August 2012 - 75
ASHRAE Journal - August 2012 - Emerging Technologies
ASHRAE Journal - August 2012 - 77
ASHRAE Journal - August 2012 - 78
ASHRAE Journal - August 2012 - 79
ASHRAE Journal - August 2012 - Products
ASHRAE Journal - August 2012 - 81
ASHRAE Journal - August 2012 - Refrigeration Applications
ASHRAE Journal - August 2012 - 83
ASHRAE Journal - August 2012 - IAQ Applications
ASHRAE Journal - August 2012 - 85
ASHRAE Journal - August 2012 - 86
ASHRAE Journal - August 2012 - 87
ASHRAE Journal - August 2012 - Washington Report
ASHRAE Journal - August 2012 - 89
ASHRAE Journal - August 2012 - Special Products
ASHRAE Journal - August 2012 - 91
ASHRAE Journal - August 2012 - 92
ASHRAE Journal - August 2012 - 93
ASHRAE Journal - August 2012 - 94
ASHRAE Journal - August 2012 - Classified Advertising
ASHRAE Journal - August 2012 - Advertisers Index
ASHRAE Journal - August 2012 - Cover3
ASHRAE Journal - August 2012 - Cover4
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_QJLWMC
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_MCDEBX
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_WNYSQY
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_XATVOD
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_FJSHSS
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_CCBZDS
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_XDEFVG
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2023november_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2023november
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_VHGNBL
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_WPKBNJ
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_UUVCDE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_RTGDEW
https://www.nxtbook.com/nxtbooks/ashrae/ashraemexico_2023
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_LKRFXS
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_AZSOFG
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_ERCDBH
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_QWDFRV
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_JHGVDF
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_OPUYHG
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_SREIBM
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_LRTGLK
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_OKRFGH
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2022november_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2022november
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_TZSERA
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_LVRUIX
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_RPTVYZ
https://www.nxtbook.com/nxtbooks/ashrae/mini_pub_catalog
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_XIYTGD
https://www.nxtbook.com/nxtbooks/ashrae/ashraemexico_2022
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_RFGDOB
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_PABXNU
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_REMKLS
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_PICVBT
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_AOYTVW
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_JQOPLS
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_IOYTBC
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_SGAJJF
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_IGHYER
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_PDRKLS
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2021november
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2021november_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_XCODFR
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_QSLFGO
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_ILKVNM
https://www.nxtbook.com/nxtbooks/ashrae/ashraemexico_2021
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_OPDJKD
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_VJKSRY
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_SDHUTC
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_JPPKRR
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_SDLTTH
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_CKLLES
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_SLDOX
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_HJETUK
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_OLUHGE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2020october
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2020october_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_ZERDGH
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_QVMNEO
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_RTPOKE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_BBATRE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_STUBMW
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_TPEMPE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_JNMKDS
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_FBTTPA
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_WQMMNE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_TVBRYN
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_showguide2020
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_KTUZMA
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_ABEDGD
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201910
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201909
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2019septmeber_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2019september
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201908
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201907
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201906
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201905
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201904
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2019april
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201903
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2019march
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201902
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201901
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_showguide2019
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2018december
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2018november
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2018fall_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2018fall
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2018october
https://www.nxtbook.com/nxtbooks/ashrae/ashraemexico_2018
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201810
https://www.nxtbook.com/nxtbooks/ashrae/ashraeinsights_201806
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201805
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201804
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201803
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201712
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201711
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201710
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2017fall_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2017fall
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201709
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201705
https://www.nxtbook.com/nxtbooks/ashrae/ashrae_meetinginsert_201610
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2016fall_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2016fall
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_acrexindia
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2015summer_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2015summer
https://www.nxtbook.com/nxtbooks/amca/2014summer2
https://www.nxtbook.com/nxtbooks/amca/2014summer
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_acma_2014summer
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201311
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201309
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_acmasupp_2013fall
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201305
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201303
https://www.nxtbook.com/nxtbooks/ashrae/pubcatalog_2013winter
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201211
https://www.nxtbook.com/nxtbooks/ashrae/achr_expo_mexico2012
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201209
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201208_v3
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201208_v2
https://www.nxtbook.com/nxtbooks/ashrae/pubcatalog_2012summer
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201205
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201203
https://www.nxtbook.com/nxtbooks/ashrae/pubcatalog_2012winter
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201111_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201109_v2
https://www.nxtbook.com/nxtbooks/ashrae/pubcatalog_2011summer
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201105
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201103
https://www.nxtbookmedia.com