Super Insulated Building Enclosures (SEABEC 2013)
-
Upload
rdh -
Category
Engineering
-
view
571 -
download
5
description
Transcript of Super Insulated Building Enclosures (SEABEC 2013)
![Page 1: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/1.jpg)
May 21, 2013 – SEABEC - Zen and the Art of Building Enclosure Design
Super Insulated Building Enclosures – Balancing Energy, Durability, and Economics in the Pacific Northwest
! Graham Finch, MASc, P.Eng RDH Building Sciences Inc. Vancouver, BC/Seattle, WA
![Page 2: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/2.jpg)
Presentation Outline
! What are “Super-Insulated” buildings and what are the drivers?
! Thermal bridging – problems and solutions
! Designing of highly insulated walls – insulation placement & durability considerations
! Super-Insulated wood-frame building enclosure design guide
![Page 3: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/3.jpg)
! Energy codes outline minimum thermal performance criteria based on climate zone ! ASHRAE 90.1, IECC – US
! WSEC 2012, SEC 2012– Washington State & City of Seattle
! OEESC 2010 – Oregon State
! Energy codes in Pacific Northwest are some of most stringent but are also the best implemented in North America
! Building enclosure (R-value/U-values) very important part of compliance
! Effective R-values considered
From Energy Codes to Super Insulation
![Page 4: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/4.jpg)
! Most Energy Codes now consider effective R-values
! Nominal R-values = Rated R-values of insulation which do not include impacts of how they are installed ! For example R-20 batt insulation or
R-10 foam insulation
! Effective R-values include impacts of insulation installation and thermal bridges ! For example nominal R-20 batts within
steel studs becoming ~R-9 effective, or in wood studs ~R-15 effective
Effective R-values
![Page 5: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/5.jpg)
! In Pacific Northwest - minimum energy code R-value targets generally in range of: ! R-15 to R-25 effective for walls
! R-25 to R-50 effective for roofs
! R-2 to R-4 for windows
! Green or more energy efficient building programs including Passive House - R-value targets in range of: ! R-30 to R-50+ effective for walls
! R-40 to R-60+ effective for roofs
! R-6+ for windows
! Other drivers – comfort, passive design, mold-free
! What does Super Insulation mean?
From Energy Codes to Super-Insulation
![Page 6: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/6.jpg)
Super Insulated?
12” EPS insulation boards (blocks?) R-54
![Page 7: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/7.jpg)
Super Insulated?
8” XPS insulation below grade R-40
6” mineral fiber (stainless brick ties) over insulated 2x6 wood frame ~R-38
![Page 8: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/8.jpg)
! Good to have super insulated walls and roofs – but what about thermal bridges and poorly insulated windows?
Super Insulated?
![Page 9: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/9.jpg)
! Thermal bridging occurs when a more conductive material (e.g. metal, concrete, wood etc.) bypasses a less conductive material (insulation)
! Minimizing thermal bridging is key to energy code compliance and an energy efficient building
! Balance of good window performance and appropriate window to wall ratio
! Use of exterior continuous insulation with thermally improved cladding attachments
! Minimizing the big thermal bridges
! Energy codes have historically focused on assembly R-values – however recently more attention is being placed on R-values of interfaces and details
! Also impacts comfort, condensation, and mold
Energy Codes and Thermal Bridging – A Balancing Act
![Page 10: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/10.jpg)
! Whole building airtightness testing requirements in Seattle and Washington State building codes are driving improvements in energy efficiency
! Various solutions to achieve higher degrees of airtightness
! Target of 0.40 cfm/ft2 at 75 Pa is frequently being met – range of 0.10 to 0.20 cfm/ft2 possible with some solutions
Building and Energy Codes and Airtightness
![Page 11: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/11.jpg)
! Windows significantly influence overall building enclosure performance ! Think about what R-3
windows do within an R-20 wall – where is the balance?
! Tend to see higher window to wall ratios in multi-family and commercial buildings
! 40% to 70%+ is common ! vs 15% to 30% in homes
! Optimized area and tuned SHGC, windows can have a positive impact (passive design strategies)
Challenges to Energy Efficiency – Windows
![Page 12: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/12.jpg)
Impact of Windows on Whole Building R-values
![Page 13: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/13.jpg)
! Concrete balconies, eyebrows and exposed slab edges are one of the most significant thermal bridges
! Essentially ~R-1 component
! This reduce overall effective R-value of the whole wall area by 40 to 60% (for something that is just a few % of the overall wall area)
! Adding insulation to surrounding walls often can’t make up for the loss associated with the detail
Challenges to Energy Efficiency – Balcony & Exposed Slabs
![Page 14: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/14.jpg)
! Example of slab/balcony impact: ! Slab edge typically occupies ~8% of the
gross wall area (8” slab in 8’8” high wall)
! Balconies may occupy 1-2% of the gross wall area
! Window to wall ratio affects opaque wall area
Impact of Concrete Balconies and Exposed Slab Edges
Exposed Slab Edge Percentage for Different WWR
100% wall: 0% windows
60% wall: 40% windows
50% wall: 50% windows
40% wall: 60% windows
20% wall: 80% windows
8” slab, 8’ floor to ceiling
7.7% 12.8% 15.4% 19.2% 38.5% Exposed Slab Edge Percentage for Different WWR
100% wall: 0% windows
60% wall: 40% windows
50% wall: 50% windows
40% wall: 60% windows
20% wall: 80% windows
8” slab, 8’ floor to ceiling 7.7% 12.8% 15.4% 19.2% 38.5%
![Page 15: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/15.jpg)
! Cast-in thermal breaks ! Standard in Europe – becoming
more available in North America
! Pre-cast and discretely attached concrete balconies (bolt on)
Solutions for Balconies
![Page 16: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/16.jpg)
! Exterior insulation is only as good as the cladding attachment strategy
! How to achieve continuous insulation performance?
! Flashings and other details also important
Challenges to Energy Efficiency – Cladding Attachment
![Page 17: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/17.jpg)
! Many Possible Strategies – Wide Range of Performance
Cladding Attachment through Exterior Insulation
![Page 18: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/18.jpg)
Effective R-values of Various Cladding Attachments
Goo
d B
ad
Ugl
y
![Page 19: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/19.jpg)
Strategies: Thermally Improved Cladding Attachments
![Page 20: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/20.jpg)
Strategies Wood-frame: Screws through Exterior Insulation
Longer cladding Fasteners directly through rigid insulation (up to 2” for light claddings)
Long screws through vertical strapping and rigid insulation creates truss (8”+) – short cladding fasteners into vertical strapping Rigid shear block type connection
through insulation, cladding to vertical strapping
![Page 21: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/21.jpg)
! Wide range of R-values marketed with polyisocyanurate (polyiso) and closed-cell (2 pcf) sprayfoam insulation
! Polyiso – reports of R-5 up to R-7.5 ! Closed cell sprayfoam – reports of R-5 to 6.5
! Both influenced by age (off-gassing of blowing gases, replaced with air makes worse with time)
! R-value changes with temperature
! Higher density equals lower R-values
! This isn’t new science or information ! Real long-term thermal resistance (LTTR)
values for both products in the R-4.5 to R-5.5 range when you need them
Challenges to True Energy Efficiency – R-value Claims
![Page 22: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/22.jpg)
Real Insulation R-values – Old Science
From: Canadian Building Digest #149, 1972
Vari
ous
N.A
. Pol
yiso
Sam
ples
&
Age
s - N
ames
Rem
oved
Old
er a
nd h
ighe
r den
sity
winter summer
Room Temperature
![Page 23: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/23.jpg)
! Wide range of aluminum foil radiant barrier products on market (paints too)
! Varying marketing claims – anything from R-1 all the way up to R-15+
! Realistically may achieve R-1 to R-3 (very still air) if product faces a dead air cavity (ref. testing by many institutes)
! Be very wary of false claims & suspicious test results
! Why care? Often cheaper to use real insulation
Challenges to True Energy Efficiency – To Good to be True!
![Page 24: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/24.jpg)
! Wood-framed buildings generally provide good R-values, but… ! Taller wood-frame buildings – higher stud framing factors
! Solid wood buildings – Cross Laminated Timber (CLT)
! Where to insulate & air-seal - what assemblies to use?
New and Upcoming Challenges to Energy Efficiency?
![Page 25: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/25.jpg)
! Trend towards more highly insulated building enclosures due to higher energy code targets and uptake of passive design strategies ! Often means new enclosure assemblies (mainly walls) and
construction techniques
! Higher R-value windows (triple glazing and less conductive window frames)
! Reduction of thermal bridging, more structural analysis of façade components, balconies etc.
! Super insulation achieved with proper balance!
! Long-term performance of new assemblies (particularly wood frame) can be a challenge in our wet environment
Moving Towards Super Insulated Enclosures
![Page 26: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/26.jpg)
! Thermal insulation continuity & effectiveness – energy code driven
! Airflow control/airtightness – energy code and building code driven
! Control of condensation and vapor diffusion – building code driven
! Control of exterior moisture/rainwater & detailing – building code driven
! More insulation = less heat flow to dry out moisture ! Amount, type and placement of insulations matters
! Greater need to more robust and better detailed assemblies
! Potentially more sensitive to vapor, air & moisture issues
Energy Efficient Building Enclosure Design Fundamentals
![Page 27: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/27.jpg)
What about the Pacific Northwest
![Page 28: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/28.jpg)
! Continue to repair moisture damaged buildings in the Pacific Northwest
Not Super Insulated.. Lower Risk But Still Failed
![Page 29: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/29.jpg)
Definitely Not Super Insulated.. But Still Failed
![Page 30: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/30.jpg)
“Super Insulated” Glazing Systems .. Failed
Systemic Failure of proprietary triple glazing units
![Page 31: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/31.jpg)
! Rainwater penetration causes most problems –poor details (e.g. lack of, poorly implemented, bad materials)
! Air leakage condensation can cause problems
! Vapor diffusion contributes but doesn’t cause most problems – unless within a sensitive assembly
! Many windows leak and sub-sill drainage and flashings are critical, other details and interfaces also important
! Insulation inboard of structural elements decreases temperatures which increases risk for moisture damage
! Durability of building materials is very important
! Watch over-use of impermeable materials in wet locations
! Drained & ventilated rainscreen walls & details work well ! Unproven materials/systems can be risky
What Have We Learned from Past Enclosure Failures?
![Page 32: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/32.jpg)
Insulation Placement and Assembly Design Considerations
Interior Insulation
Exterior Insulation
Split Insulation
![Page 33: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/33.jpg)
Getting to Higher R-values – Placement of Insulation
Baseline 2x6 w/ R-22 batts = R-16 effective
Exterior Insulation – R-20 to R-40+ effective • Constraints: cladding attachment, wall thickness • Good for wood/steel/concrete
Deep/Double Stud– R-20 to R-40+ effective • Constraints wall
thickness • Good for wood,
wasted for steel
Split Insulation– R-20 to R-40+ effective • Constraints: cladding
attachment • Good for wood, palatable for
steel
New vs Retrofit Considerations
![Page 34: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/34.jpg)
! Insulation outboard of structure and control layers (air/vapor/water)
! Thermal mass at interior where useful ! Cladding attachment biggest source of thermal loss/bridging
! Excellent performance in all climate zones – But is not the panacea, can still mess it up
Exterior Insulated Walls
Steel Stud Concrete Heavy Timber (CLT)
![Page 35: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/35.jpg)
! Key Considerations: ! Cladding attachment
! Wall thickness
! Heat Control: Exterior insulation (any type)
! Air Control: Membrane on exterior of structure
! Vapor Control: Membrane on exterior of structure
! Water Control: Rainscreen cladding, membrane on exterior of structure, surface of insulation
Key Considerations - Exterior Insulation Assemblies
![Page 36: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/36.jpg)
Key Considerations - Split Insulation Assemblies
! Key Considerations: ! Exterior insulation type
! Cladding attachment
! Sequencing & detailing
! Heat Control: Exterior and stud space Insulation (designed)
! Air Control: House-wrap adhered/sheet/liquid membrane on sheathing, sealants/tapes etc. Often vapor permeable
! Vapor Control: Poly or VB paint at interior, plywood/OSB sheathing
! Water Control: Rainscreen cladding, WRB membrane, surface of insulation
![Page 37: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/37.jpg)
Split Insulation Assemblies – Exterior Insulation Selection
! Rigid exterior foam insulations (XPS, EPS, Polyiso, closed cell SPF) are vapor impermeable (in thicknesses, 2”+) ! Is the vapor barrier on the wrong side?
! Does the wall have two vapor barriers?
! How much insulation should be put outside of the sheathing? – More is always better, but is there room? Cost?
! Semi-rigid or rigid mineral or glass fiber insulations are vapor permeable and address these concerns
! Vapor permeance properties of sheathing membrane (WRB)/air-barrier is also important
![Page 38: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/38.jpg)
Split Insulation and Moisture Risk Assessment
Insulation Ratio Here is over 2/3 to the exterior of the sheathing Careful with lower ratios with foam
![Page 39: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/39.jpg)
! R-value design target up to R-25 for steel framed wall assembly. Energy modeling showed could trade-off a bit but no lower than R-18.2 (code)
! 6” steel stud frame wall structure (supported outboard of slab edge, and perimeter beams)
! Expectation to be cost effective, buildable and minimize wall thickness
! Tasked with the evaluation of a number of potential options
! Lack of performance from standard practices helped innovate a new solution
Case Study: Bullitt Center – Split Insulation Wall Assembly
![Page 40: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/40.jpg)
Bullitt Center – Exterior Wall Assembly Evaluation
Baseline: R-19 batts within 2x6 steel stud with exposed slab edges = R-6.4 effective Considered 2x8 and 2x10 studs - still less than R-8
Target R-value up to R-25
Vertical Z-Girts (16” oc) 5” (R-20) exterior insulation plus R-19 batts within 2x6 steel stud = R-11.0 effective
Horiz. Z-Girts (24” oc) 5” (R-20) exterior insulation plus R-19 batts within 2x6 steel stud = R-14.1 effective Crossing Z-girts also evaluated <R-16 effective
Intermittent Metal Clips 5” (R-20) exterior insulation plus R-19 batts within 2x6 steel stud = R-17.1 effective up to R-21 with some modifications
![Page 41: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/41.jpg)
The Need to Go Higher – Reduce the Thermal Bridging
![Page 42: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/42.jpg)
The Need to Go Higher – Reduce the Thermal Bridging
Intermittent Fiberglass Spacers, 3½” to 6” (R-14 to R-24) exterior insulation = R-19.1 to R-26.3 + effective
![Page 43: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/43.jpg)
! Metal panel
! 1” horizontal metal hat tracks ! 3 ½” semi-rigid mineral fiber (R-14.7)
between 3 ½” fiberglass clips
! Fluid applied vapor permeable WRB/Air barrier on gypsum sheathing
! 6” mineral fiber batts (R-19) between 6” steel studs
! Gypsum drywall
! Supported outboard slab edge (reduce thermal bridging)
! Effective R-value R-26.6
Bullitt Center – Exterior Wall Assembly
![Page 44: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/44.jpg)
! Double 2x4/2x6 stud, single deep 2x10, 2x12, I-Joist etc.
! Common wood-frame wall assembly in many passive houses (and prefabricated highly insulated walls)
! Often add interior service wall – greater control over airtightness
! Inherently at a higher risk for damage if sheathing gets wet (rainwater, air leakage, vapor diffusion) – due to more interior insulation
Double/Deep Stud Insulated Walls
![Page 45: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/45.jpg)
Key Considerations – Double Stud/Deep Stud
! Key Considerations: ! Air-sealing
! Rainwater management/detailing
! Heat Control: Double stud cavity fill insulation(s) – dense-pack cellulose, fiberglass, sprayfoam
! Air Control: House-wrap/membrane on sheathing, poly, airtight drywall on interior, OSB/plywood at interior, tapes, sealants, sprayfoam. Airtightness on both sides good
! Vapor Control: Poly, VB paint or OSB/plywood at interior
! Water Control: Rainscreen cladding, WRB at house-wrap/membrane, flashings etc.
![Page 46: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/46.jpg)
Deep/Double Stud and Moisture Risk Assessment
![Page 47: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/47.jpg)
! Guide to the Design of Energy Efficient Building Enclosures – for Wood Multi-Unit Residential Buildings
! Provides design and detailing guidance for highly insulated wood-frame wall & roof assemblies
! Contains North American energy code guidance, building science fundamentals
! Insulation placement, air barrier systems, cladding attachment
! Available as a free download direct from FP Innovations (google the title above)
Further Guidance on Highly Insulated Walls & Details
![Page 48: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/48.jpg)
! Deep energy retrofit of 1980s vintage concrete frame multi-unit residential building – owners decision to renew aesthetic (old concrete, leaky windows)
! Original overall effective R-value R-2.8
! Exterior insulate and over-clad existing exposed concrete walls (R-18 eff.)
! Install new triple glazed fiberglass frame windows (R-6 eff.) – triple glazing incremental upgrade <5 year payback
! Retrofitted effective R-9.1 (super-insulated for a building of this type)
! 55% reduction in air leakage measured
! Enclosure improvements 20% overall savings (87% space-heating)
! Actual savings being monitored – seeing higher than predicted savings
Final Thoughts – Super-Insulation Retrofit Case Study
![Page 49: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/49.jpg)
! Super-Insulated building enclosures require careful design and detailing to ensure durability ! Balancing materials, cost, and detailing considerations
! Cladding attachment detailing – minimize loss of R-value of exterior insulation
! Shifting insulation to the outside the structure improves performance and durability – balance is often cost
! Super-Insulated buildings require balancing thermal performance of all components & airtightness ! No point super-insulating walls/roofs if you have large thermal
bridges or poor performing windows - address the weakest links first
! Opportunities for both new and existing buildings
Final Thoughts – “The Art and Balance”
![Page 50: Super Insulated Building Enclosures (SEABEC 2013)](https://reader034.fdocuments.net/reader034/viewer/2022042714/55764d8fd8b42aaa548b45d5/html5/thumbnails/50.jpg)
Questions
! Graham Finch – [email protected]
! Highly Insulated Wood-frame Enclosure Guide – FP Innovations