Welcome to the BCBC 2018 Update Sessions

Session 4.10

Part 9 Specific to

Building Envelope And Structure

BOABC Presentation Changes

The BOABC have made some changes to this presentation to provide information that is specific to the BC Building Code. Presentations are provided by BOABC under licence with National Research Council Canada (NRC). No Reproduction without licence from NRC.

Building envelope and structure

Author: Mihailo Mihailovic and Elisabeth Girgis, Codes Canada

National Building Code Part 9

CODES CANADA

Part 9 – Housing and small buildings

Lateral loads (seismic) Continuous insulation materials Limited water doors New snow load values Protection above cooktops

Handbook : pages 52-61 4

Changes to the Envelope Elements of a Part 9 Building

Section 9.7. Windows, Doors and Skylights

Subsection 9.7.4. Design and Construction Article 9.7.4.2. Standards

Deals with a term known as a “Limited Water” door

within the NAFS standard and lists locations where

their use is permitted.

Changes to the Envelope Elements of a Part 9 Building

Section 9.25. Heat Transfer, Air Leakage and Condensation Control

Subsection 9.25.2. Thermal Insulation 9.25.2.2. Insulation Materials

Subsection 9.25.5. Properties and Position of Materials in the Building Envelope

9.25.5.1. General

Changes to the Envelope Elements of a Part 9 Building

Please Note Sections

9.26. Roofing, 9.27. Cladding, and

9.11. Sound Protection

also contain revisions. Please see material for the EIFS, ASTC and

Roofing Session presentation.

Limited water doors Article 9.7.4.2

Exposed main entrance doors must be tested with pressure difference Limited water (LW) rated doors must be protected from precipitation

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LW

Other: Mineral wool roof insulation 9.25.2.2.(1)

Refers to ASTM C 726, “Mineral Wool Roof Insulation Board”

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A third material property path for exterior insulation

Changes to the Envelope Elements of a Part 9 Building

Continuous insulation materials 9.25

To minimize condensation for materials with:

- Air leakage < 0.1 L/(s•m²) @ 75 Pa

- Water vapour permeance < 60 ng/(Pa•s•m²)

NBC 2010 required:

- Ratio of outboard to inboard insulation must comply with Table 9.25.5.2.

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Inboard Outboard

Continuous insulation materials 9.25.5.1.(4)

12

0 0.1

Water vapour permeance ng/(Pa•s•m²)

0

60

300

30 Table 9.25.5.2.

Extruded (XPS) polystyrene Type I

Expanded (EPS) polystyrene Type II Fibrous

insulations

Polyurethane spray foam–low density

Polyurethane spray foam–medium density

Foil-faced polyisocyanurate

Air leakage L/(s•m²) @ 75 Pa)

New! Relaxation >30 <60 ng/(Pa•s•m²)

+R4 < 6000 HDD

Continuous insulation materials

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Average annual heating degree-days (°C)

Changes to the Structural Elements of a Part 9 Building

Section 9.3. Material, Systems and Equipment Subsection 9.3.1. Concrete

Article 9.3.1.1. General Article 9.3.1.7. Compressive Strength Article 9.3.1.8. Concrete Mixes

Section 9.4. Structural Requirements Subsection 9.4.2. Specified Loads

Article 9.4.2.2. Specified Snow Loads

Changes to the Structural Elements of a Part 9 Building

Section 9.6. Glass Subsection 9.6.1.

Article 9.6.1.3. Structural Sufficiency of Glass

Changes to the Structural Elements of a Part 9 Building

Two new defined terms, solid masonry units and solid masonry have created changes in

Section 9.15. Footings and Foundations • Subsection 9.15.5. Support of Joists and Beams

on Masonry Foundation Walls Section 9.20. Above Ground Masonry and ICF • Subsection 9.20.6. Thickness and Height • Subsection 9.20.8. Support of Loads

Section 9.21. Masonry and Concrete Chimneys • Subsection 9.21.4. Masonry and Concrete

Chimney Construction

Changes to the Structural Elements of a Part 9 Building

Section 9.23. Wood Frame Construction New available seismic loading data has had a large

impact in 9.23. Pretty much all locations within the province have a new

Sa(0.2) value assigned.

BE PREPARED

Highest value in 2012 Code 1.2 Highest value 2018 Code is 1.62

Changes to the Structural Elements of a Part 9 Building

Section 9.23. Wood Frame Construction

Appendix C Table C-2 no longer contains any seismic data.

The data now resides in its own Table C-3 Seismic Design Data (Replaces the previous Table C-3 Radon Gas now a reformatted to simply state whether a rough-in for radon gas is required or not required)

Changes to the Structural Elements of a Part 9 Building

Section 9.23. Wood Frame Construction

Wind loads • Still located in Table C-2 • appear to be unchanged with the maximum value in

BC being Sandspit at the same 0.78 kPa.

Should still be safe to say that wind load simply does not need to be addressed in BC as the Code consistently

uses the value of equal to or greater than 0.8 kPa

Caution AHJ can use their data

Changes to the Structural Elements of a Part 9 Building

Section 9.23. Wood Frame Construction Changes start in

Subsection 9.23.3. Fasteners Article 9.23.3.5. Fasteners for Sheathing or

Subflooring • Revised value in Table 9.23.3.5.-B • New Sentence (3) • New Table 9.23.3.5.-C • New Sentence (8)

Changes to the Structural Elements of a Part 9 Building

Section 9.23. Wood Frame Construction Next, Subsection 9.23.6. Anchorage

Article 9.23.6.1. Anchorage of Building Frames Now has 4 categories for anchorage • Buildings with not more than 1 floor (or a roof) supported by fame

walls in a location where the Sa(0.2) value is less than 0.7 can use the minimal anchorage.

• Buildings with 2 or more floors supported by frame walls in a location where the Sa(0.2) value is 0.7 or less.

• Buildings supported by frame walls in a location where the Sa(0.2) value is more than 0.7 but not greater than 1.8.

• Buildings in a location where the Sa(0.2) value is greater than 1.8

Changes to the Structural Elements of a Part 9 Building

Section 9.23. Wood Frame Construction Next, Subsection 9.23.11. Wall Plates

Article 9.23.11.4. Joints in Top Plates New sentence and accompanying Table for

fastening joints

Changes to the Structural Elements of a Part 9 Building

Section 9.23. Wood Frame Construction Lastly, Subsection 9.23.13. Bracing to Resist Lateral

Loads Due to Wind and Earthquake

Review the Notes comments regarding Heavy Construction

Changes to the Structural Elements of a Part 9 Building

Subsection 9.23.13. Bracing to Resist Lateral Loads Due to Wind and Earthquake

Article 9.23.13.. Requirements for High Wind and Seismic Forces

Article 9.23.13.3. Requirements for Extreme Wind and Seismic Forces

Article 9.23.13.5. Braced Wall Panels in Braced Wall Bands

Table 9.23.13.5.

Changes to the Structural Elements of a Part 9 Building

Subsection 9.23.13. Bracing to Resist Lateral Loads Due to Wind and Earthquake

Article 9.23.13.6. Materials in Braced Wall Panels Table 9.23.13.6. Revised Article 9.23.13.11. Additional System Considerations Sentence (3) is revised to include the

new top plate splice nailing as per 9.23.11.4.(5)

Lateral loads (seismic) Appendix C Table C-3

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Courtesy of: J. Adams, 2015

Lateral loads (seismic) 9.23

Provides prescriptive solutions for all Canada Increases lateral resistance with:

- Thicker sheathing - Blocking between studs - Nailing of splices in wall top

plates - Reduced spacing between

anchor bolts

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Takeaways

New lateral load (seismic) requirements Relaxation for continuous insulation materials in milder climates Limited water doors permitted where protected Microwaves and stove hoods exempt from clearances New snow load data

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Thank you

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