Healthy, Durable, Low Energy Buildings: Thermal: High R. Thermal bridges. Fundamentals, techniques, and pitfalls
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1 Dr John Straube, P.Eng. Associate Professor, University of Waterloo Principal, Building Science Corporation Healthy, Durable, Low Energy Buildings: Fundamentals, techniques, and pitfalls Thermal: High R Building Science.com 2 Thermal bridges Find the thermal bridge Thermal bridges provide shortcut for heat through insulation Heat passes through the structural members Common offenders Floor and balcony slabs Shear walls Window frames Steel studs Insulation and Thermal Bridges No. 3/65 Insulation and Thermal Bridges No. 4/65 Straube buildingscience.com 1 of 14
2 Find the thermal bridge Insulation and Thermal Bridges No. 6/65 Thermal Bridging Steel is 400 times more conductive than wood Steel studs are about 40 times thinner R<0.3 Cold R=4+ Batt 3.5 wall Insulation and Thermal Bridges No. 7/65 Hot Insulation and Thermal Bridges No. 8/65 Straube buildingscience.com 2 of 14
3 Complexity Air, thermal continuity Adding Insulation Reduces Durability Insulating makes in/out face of enclosure cold Gypsum board or OSB in normal walls Condensation occurs on cold surface Drying occurs slowly when cold Ergo... Insulating makes things wetter! Air & water vapor moves through fiberglass and cellulose Foam stops air and slows vapor 9 Building Science.com Efficient Enclosures & HVAC Airtight buildings require ventilation systems Don t over ventilate. Quality Quantity Better windows, insulation & lighting = Low heat gain = dehumidification = less sensible cooling Different HVAC systems can now be applied Enthalpy recovery Radiant cooling? DOAS? R14 and leaky Buildings,Energy, Environment No. 11/84 Straube buildingscience.com 3 of 14
4 Straube buildingscience.com 4 of 14
5 Double Stud: Exposes sheathing! Air leakage risk. R16-R22 A few products provide R EIFS can be added to get R40 Insulated Concrete Forms Excellent enclosure system Concrete acts as air barrier No vapor barrier needed Expensive, but high performance Insulation and Thermal Bridges No. 19/65 Building Science.com 20 Straube buildingscience.com 5 of 14
6 Structural Insulated Panels EPS EPS Advantages Superior blanket of insulation if no voids then no convection or windwashing May seal OSB joints for excellent air barrier system Therefore, done right = excellent Small air leaks at joints in roofs can cause problems Don t get them too wet from rain Low perm layers means limited drying EPS Insulation and Thermal Bridges No. 22/65 Rimjoist thermal bridging Air leakage risks Air barrier R22 Beware Joints No vapor barriers Insulation and Thermal Bridges No. 23/65 Straube buildingscience.com 6 of 14
7 Rimjoist thermal bridging Air leakage risks Air barrier! Cellulose is your friend Building Science.com 26 Straube buildingscience.com 7 of 14
8 Pitched Roof Types Vented Attic Insulation/air barrier at ceiling plane Cathedral Ceiling Insulation/air barrier at roof plane Pitched Roof Types Unvented Cathedralized Attic As cathedral but no venting above insulation Unvented Cathedral Ventilated Attics Ventilated Cathedral Ceilings R60-75 economically available or spray foam seal Straube buildingscience.com 8 of 14
9 Limitations of Ventilated Cathedral Limitations Unvented Cathedralized Attics Move air and insulation control from ceiling plane to roof plane Moves HVAC into conditioned space Saves lots of energy, reduce problems with comfort, extends life of equipment Avoids wind blown rain, snow, and burning wildfire embers Building Science.com 36 Straube buildingscience.com 9 of 14
10 R40+ roof, fire protection Cold Climate (Zone 5/6) Solution Building Science.com 37 Insulation and Thermal Bridges No. 38/65 Unvented Cathedral Ceiling Low-Slope Roofs Cover most commercial buildings Not flat. Ponding is not acceptable. Components Air barrier can be roof membrane Better to install interior Rain barrier is roof membrane Drainage gap is the outdoors Insulation is rigid, usually polyiso Straube buildingscience.com 10 of 14
11 Good Compromise Building Science.com 41 Straube buildingscience.com 11 of 14
12 Pitched Roofs Same physics Roof membrane sees less rain load and no pooling Hence membranes last longer or can be lower performance Basements Less extreme temperatures But soil is always wet Soil has huge thermal mass Insulation Location Choices Builders like to insulate the interior Foundations and Basements No. 47/74 Foundations and Basements No. 48/74 Straube buildingscience.com 12 of 14
13 Hybrid Add layer of: foam or spray foam To allow inward drying prefer about 1 perm Building Science.com 49 Foundations and Basements No. 50/74 Foundations and Basements No. 51/74 Joseph Lstiburek 52 Straube buildingscience.com 13 of 14
14 Spray foam basement insulation Open cell Climate specific Closed cell Insulated Concrete Forms (ICF) If you afford it, use them cap break, insulation, vapor retarder, above grade Foundations and Basements No. 53/74 Foundations and Basements No. 54/74 Straube buildingscience.com 14 of 14
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