Performance Assessment for the Orchards at Orenco Passive House - - PowerPoint PPT Presentation

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Performance Assessment for the Orchards at Orenco Passive House - - PowerPoint PPT Presentation

Jul 08, 2023 114 likes •552 views

Wall Enclosure Monitoring and Performance Assessment for the Orchards at Orenco Passive House PORTLAND BEC / WALSH CONSTRUCTION CO / ROXUL APRIL 3, 2017 JONATHAN SMEGAL, SENIOR PROJECT MANAGER, RDH BUILDING SCIENCE. Orchards at Orenco

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Wall Enclosure Monitoring and Performance Assessment for the Orchards at Orenco Passive House

PORTLAND BEC / WALSH CONSTRUCTION CO / ROXUL APRIL 3, 2017 JONATHAN SMEGAL, SENIOR PROJECT MANAGER, RDH BUILDING SCIENCE.

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Orchards at Orenco

  • Moisture Monitoring System
  • Data Analysis Graphs
  • Exterior Insulation
  • Comparison of two different High-R wall

assemblies

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(Roxul Comfortboard 80)

Smegal Jonathan and John Straube. “Hygrothermal Analysis of Exterior Rockwool Insulation.” December 2011. Building Science Corporation. RR-1104. www.buildingscience.com/documents/reports/rr-1104-hygrothermal-analysis- exterior-rockwool-insulation

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Stud Cavity Instrumentation

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  • In all four suites
  • “Guard bay” on

each side of measurement bay

  • Sensors at different

heights in the cavity

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Relative Humidity

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  • With a temperature

sensor

  • Vapor permeable

water proof protective cover

  • Two locations

against sheathing

  • Two locations at

mid depth

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Moisture content

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  • Metal pins
  • Tip measurement
  • Electrical

resistance correlates to wood moisture content

  • With a temperature

sensor

  • Three locations on

sheathing, one on framing

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Exterior Sensors

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  • Relative humidity

sensors on the interior and exterior surface of the exterior insulation

  • *Some redundancy

as a backup*

  • A lot of care taken

at penetrations

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Exterior RH

  • Interior and

exterior surface

  • f Roxul

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Boundary Conditions

  • Interior Conditions

– Measured at HRV return – Hobos

  • Exterior Conditions

– Local weather station data

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Data Analysis

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Performance Evaluation Criteria

  • Sheathing moisture content – highest likelihood of

moisture accumulation in colder climates

  • Relative humidity at the sheathing – keep in mind

duration, temperature

  • Sheathing dew point – compare interior dew point to

sheathing temperature

  • Mold Index
  • Start by looking at the interior boundary conditions

since they significantly influence the wall performance

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Interior Conditions - temp

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Interior Conditions - RH

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Sheathing moisture content

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Sheathing relative humidity - North

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Sheathing temperature - North

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Sheathing relative humidity - South

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Sheathing Dew Point

  • Compare the dew point of the interior suite air to

sheathing temperature.

  • This does not mean there’s condensation
  • ccurring, just possible

– Relative Risk

  • Important to consider length of time less than

dew point, and the magnitude of the difference

  • Comparisons of a previous study

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Sheathing Dew Point

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Hours of potential condensation - North Suites 520, 411

  • South Suites 268, 267 over two years
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Sheathing Dew Point Comparison

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(5 months – 3912 hours)

Smegal, Jonathan, Joseph Lstiburek, John Straube, and Aaron Grin. “Moisture-Related Durability of Walls with Exterior Insulation in the Pacific Northwest.” Paper presented at Thermal Performance of the Exterior Envelopes

  • f Whole Buildings XII International Conference, Clearwater, FL, December 2013.

http://www.buildingsciencelabs.com/wp-content/uploads/2014/11/Clearwater-2013-Smegal.pdf

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Mold Index

  • Some research

conducted shows ASHRAE 160 correlates poorly to biological growth.

  • The Finnish VTT

has been shown to provide a greater degree of reliability.

  • All suites in

Orchards are 0 on the index

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Exterior Insulation (CI)

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Advantages of CI

  • Continuous

– Significantly reduces thermal bridging (increases effective R-value)

  • Energy benefits
  • Comfort benefits
  • Exterior

– Increases temperature of the condensation plane – Durability benefits, reduced risk of moisture condensation and accumulation

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Best-case R-values for stud walls

www.BuildingSci ence.com Assumes no floor slabs, no double studs etc.

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  • “Perfect” or “Ideal Wall”
  • Must consider cost, constructability, etc.
  • Compromises on insulation location
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Screws Through Insulation

  • Rapidly gaining popularity to meet increasing

R-value requirements

  • Uncertainty about:

– How to do it – Allowable loads – Fastener types – Fastener spacing – Deflection

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Extensive testing has demonstrated performance

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Screws Through Insulation Highly Effective

0% 10% 20% 30% 40% 50% 60% 70% 80% 90%100%

Fiberglass Clip No Through Screws Stainless Steel Screws Fiberglass Clip SS Screws Galvanized Screws Fiberglass Clip Galv. Screws Isolated Galvanized Clip Stainless Steel Clip Intermittent Galvanized Clip Aluminum T-Clip Continuous Horizontal Z-Girt Continuous Vertical Z-Girt

Percent Effectiveness of Exterior Insulation (Typical Range) Galvanized Steel Screws Stainless Steel Screws

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Comparison of two different High-R wall assemblies

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Enclosure Performance Comparison

  • Two Passive House projects

– Victoria, British Columbia – Portland, Oregon

  • Very similar temperatures (HDD)
  • Both High-R wall assemblies

– Different strategies – Both have moisture monitoring installed

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*Smegal, Jonathan, Robert Lepage, and Chris Schumacher. “Moisture-Related Durability of InService High-R Wall Assemblies in Pacific Northwest Climates.” Paper presented at Thermal Performance of the Exterior Envelopes of Whole Buildings XIII International Conference, Clearwater, FL, December 2016.

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(Roxul Comfortboard 80)

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Evaluation Criteria

  • Challenge of comparing the performance of two

different buildings in different cities – Show the relationship between exterior temperature and sheathing temperature – Mold Index

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Conclusions

  • From the analysis of measurement data, there is

no indication of any moisture related durability risks in the enclosure at the Orchards Passive House.

  • Using continuous exterior insulation has both

energy and durability related benefits that reduce the risk of moisture issues in the enclosure compared to a similar wall without exterior insulation

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Acknowledgements

  • ROXUL Energy Design Center for funding the

research

  • Walsh Construction Co. for providing a building

to monitor, and helping ensure the installation went as smoothly as possible

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Contact me at:

jsmegal@rdh.com

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