Building Science and Imperfection
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1 Building Science and Imperfection Managing Risk in Building Enclosures Christy Cronin, Building Science Corporation Out of the crooked timber of humanity no straight thing was ever made. Immanuel Kant Cronin buildingscience.com 1 of 16
2 Houston IAQA Building Science and Imperfection: Managing Risk in Building Enclosures October 16, 2015 Five Approaches to Risk Mitigation in Building Enclosures 1. Buildings are complicated 2. Think in terms of functions, not products 3. Water shedding is different than waterproofing 4. Decide what is inside and what is outside 5. Mock-ups and pre-installation meetings are really important Construction time throughout history Notre Dame de Paris completed 1345 Johnny Appleseed Cronin buildingscience.com photo by Gavin Malavolta, 2 of 16
3 Houston IAQA Building Science and Imperfection: Managing Risk in Building Enclosures October 16, 2015 Construction time throughout history Empire State Building 410 days photo by Charley Lhasa, One World Trade Center 8 years Pyramid at Giza ~20 years photo by Joe Mabel, photo by Wilhelm Joys Andersen, Changes in building materials moisture tolerance of modern building materials varies cavity walls use more materials than mass walls Cronin buildingscience.com 3 of 16
4 Larger, higher quality homes Occupant Reported Housing Defects Lack some plumbing 4.7% 1.7% Exposed wiring 4.0% 0.6% Holes in floors 2.0% 0.9% Open cracks or holes in walls or ceilings 6.0% 4.8% Leaks from roof 7.9% 5.4% Homes with A/C Bathrooms per home ~50% ~90% Leaks in basement 29.6% 10.9% Data from U.S. Department of Housing American Housing Survey; for about the same cost Median Size of New Homes 1,525 SF 2,169 Median Sale Price of New Homes Inflation Adjusted Price/SF to 2010 Dollars) $32,708 $221,241 $103 $102 Data from U.S. Census Data on size from: Data on price from: Cronin buildingscience.com 4 of 16
5 Diversity of building types Buildings are complicated. - David Shrigley, The Essential David Shrigley Cronin buildingscience.com 5 of 16
6 Think in terms of functions, not products Basic Enclosure Functions* Support: resist and transfer physical forces Control: control mass and energy flows Rain and soil moisture (drainage plane, capillary break, etc.) Air (continuous air barrier) Heat (continuous layer of insulation) Vapor (balance of wetting & drying) Finish: interior and exterior surfaces for people * Text quoted from John Straube The Perfect Wall Cladding Control Layers Structure Cronin buildingscience.com 6 of 16
7 the perfect slab and the perfect roof Most walls are not the Perfect Wall Maintain continuity of the control layers Identify locations of cold surfaces Evaluate the wetting & drying potential of moisture sensitive materials Cronin buildingscience.com 7 of 16
8 Maintain continuity of control layers Maintain continuity of control layers Cronin buildingscience.com 8 of 16
9 Control vs. Finish Confusion Control vs. Finish Confusion Cronin buildingscience.com 9 of 16
10 Water shedding vs. waterproofing Water shedding vs. waterproofing Balcony door flashing installation sequence 3 4 Cronin buildingscience.com 10 of 16
11 Water shedding vs. waterproofing Window installation: Flexible membrane flashings are waterproofing; metal flashings are water shedding Integrate waterproofing layer with drains Cronin buildingscience.com 11 of 16
12 Decide what is inside and what is outside Case study: canopy detailing Cronin buildingscience.com 12 of 16
13 Houston IAQA Building Science and Imperfection: Managing Risk in Building Enclosures October 16, 2015 fluted metal deck of canopy Cronin buildingscience.com 13 of 16
14 Case study: vestibule detailing Vestibule entry Storefront (to be installed behind columns) excluding the vestibule from the conditioned space Extend self-adhered membrane to backside of vestibule sheathing Storefront sits on concrete cub, fully behind columns and canopy Cronin buildingscience.com 14 of 16
15 Case study: below-grade Mock-ups and pre-installation meetings are important Cronin buildingscience.com 15 of 16
16 Performance mock-ups Christy Cronin, Cronin buildingscience.com 16 of 16
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