Foam Free (Towards ZNC) High Performance and Radiance Co-Housing

Transcription

1 Passive House Northwest AIA CEU Provider Foam-Free Passive House Case Study & Madison Haus Case Study phnw L.Johnson & R.Foster & O.Martin 3/29/2018

2 Course Description A case study of the Radiance Cohousing project and it's foam-free building techniques. Also A case study for the Madison Haus.

3 Learning Objectives At the end of the this course, participants will be able to: 1. Define what qualities differentiate high-performance airtight enclosures from typical construction and how those qualities are evolving. 2. Describe practitioner concerns of foam insulation hindering efforts to meet the evolving high-performance qualities. 3. Describe how a foam free enclosure can improve durability and provide a low carbon or carbon negative Passive House building 4. Describe practical methodologies practitioners can implement, to successfully produce a Passive House enclosure that is foam free.

4 Foam Free (Towards ZNC) High Performance and Radiance Co-Housing

5 Who Am I? Scientist Green Builder Consultant Happy Father Outdoor Enthusiast Soccer Fan

6 What is high performance? 1. Comfort 2. Health 3. Efficiency 4. Resiliency 5. Affordability 6. Beauty High impact and unhealthy materials?

7 Foam is not the solution. Credit: Zerodraft 7

8 Spray Foam Dangerous Toxic ingredients Global warming potential Unacceptable fire accelerant This fire started during installation due to an excessive exothermic reaction Woods Hole, MA 2011 High level of Embodied Energy Unreliable performance Reversible? Credit: Environmental Building News See the Foam Fails series on our blog 8

9 Spray Foam Dangerous Toxic ingredients Global warming potential Unacceptable fire accelerant This fire started during installation due to an excessive exothermic reaction Woods Hole, MA 2011 High level of Embodied Energy Unreliable performance Reversible? See the Foam Fails series on our blog Credit: Environmental Building News 9

10 Thousands of Projects; Three Key Findings 1. Foam, drywall, caulk, and micro-porous membranes are not reliable air barriers 1. Air transported moisture is the 2 nd leading cause of building failure (BSC/DOE/etc) 1. Minimize risk by having inboard and outboard air tightness with balanced heat recovery ventilation

11 Turn BS into Building Science: Everybody knows foam blows and most ventilation sucks

12 Thermal Bypass Diagrams Lesson 1: Air Seal. All Sides. Keep Stuff Warm. Thermal bypass describes heat loss that gets around insulation, including:. Factor of 4.8 or a Fraunhofer Institute, Stuttgart Germany Credit: Mark Siddall, Building Green Magazine 12

13 Heat losses by convection 40 Lab test of insulating material Gap in the airbarrier/ vapor retarder in Without gap: R-Value = 19 With 0.04 inch gap : R-Value = 3.9 Performance down by factor 4.8 Hotbox conditions: Inside temperature 70 F Outside temperature 15 F Pressure difference 20 Pa = wind force 2-3 Measurement: Institute of building physics, Stuttgart Source: DBZ 12/89, page 1639ff 13

14 All Leaks Are Not Created Equal Or small negative pressure in heating climates can be helpful. 14

15 Lesson Air Control 2: Airtight, but vapor open or vapor smart Moisture load: Diffusion and Convection Gap width: 0.04 in 5.5 in With a 0.04 in gap: No vapor diffusion Only vapor convection: 28.2 oz water/day Without gap: Diffusion 0.3 perms: e.g. INTELLO: 0.017oz water/day Fraunhofer Institute, Stuttgart Germany Credit: Mark Siddall, Building Green Magazine 15

16 Lesson Air Control 2: Airtight, but vapor open or vapor smart Moisture load: Diffusion and Convection Gap width: 0.04 in 28.2 oz water/day Fraunhofer Institute, Stuttgart Germany Credit: Mark Siddall, Building Green Magazine 16

17 Poorly insulated walls are often heated dry. Well built assemblies dry through vapor diffusion (or they don t dry) 17

18 A New Frontier of Building Science. You need to assume that the building will get wet, somehow, at some point in time. Stuff happens. So you need a moisture-tolerant design. Anton TenWolde, physicist at the U.S. Forest Products Laboratory via GBA post Are Dew Point Calculations Really Necessary 18

19 Three Critical Actions #1 Air Seal - Interior and exterior - Manage vapor #2 Insulate - Interior and exterior - Vapor open #3 Ventilate - Balanced - Heat recovery

20 Air Sealing => Limit Convective Heat Echange and Control Water Vapor Actually airtight Continuous (interior/exterior) Easy to verify or repair Healthy and durable Vapor smart and vapor open Sustainable Don t forget the details!

21 Wire and pipe penetration sealing Allow for room to gasket properly Credit: Ed May, BldgTYp Credit: Roger Lin, Southern Exposure Homes 21

22 Window Details, Foam Fails

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24 Insulation Limit Conductive Heat Gain While Managing Radiant Temperatures Easy to install and durable Vapor open and easy to verify Sustainable (low embodied) Exterior R-5+ Woodfiber, cork, mineral wool (vapor open) Covered in waterproof vapor open airtightness Interior As much as can be done safely and within reason Sheep wool, mineral wool, cellulose and fiberglass are good to less bad options

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26 Smart Enclosure System

27 Radiance Co-Housing Saskatoon Photo Credit: Michael Nemeth Nine unit Co-Housing Pro Clima (complete interior/exterior system, incl. windows) Gutex continuous exterior (240mm Thermosafe, 40mm Multitherm) FPI and CWC Pilot Program for Gutex in Wood Based Buildings Completion: Summer 2018

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29 PRIVATE + SHARED SPACE The layout and shared spaces are designed into the project by the people who will be living there through a co-planning process. SHARED ELECTRIC CAR GARAGE WITH SOLAR PV ARRAY ELECTRIC CAR CHARGE STATIONS FOR EACH PARKING SPACE SHARED WORKSHOP 8 PRIVATELY-OWNED TOWNHOUSES COURTYARD / GARDEN PATIO COMMON HOUSE (CO-OWNED) WITH GUEST ROOM + MULTI-PURPOSE SPACE DESIGN BY: BLDG STUDIO

30 Radiance Co-Housing Air/Water Photo Credit: Michael Nemeth

31 Radiance Co-Housing Thermal Photo Credit: Michael Nemeth

32 Radiance Co-Housing Windows

33 Juniper Passive House Merritt, BC 30 unit low income housing!!! I-Joist Approach Pro Clima Intello X as primary air barrier and smart vapor control layer Pro Clima Mento Plus as airtight vapor open WRB and insulation net Photo Credit: Nido Design, D&T Developments Completion: Summer 2018

34 UNBC Wood Innovation Research Lab (WIRL) Prince George Canadian airtightness record (0.07 ACH50)!!! Research Lab Panelized Construction Pro Clima Intello Plus as primary air barrier and smart vapor control layer Plywood lid taped with Tescon Vana Photo Credit: Stantec Architecture Completion: Spring 2018

35 Optimized As Mass Timber?

36 We love this stuff. We help you enjoy it. Lucas Johnson