The Fall Builders Forum Part 9 Energy Efficiency and Ventilation Regulations

Transcription

1 The Fall Builders Forum Part 9 Energy Efficiency and Ventilation Regulations (Effective December 19, 2014) John de Ruiter Manager, Permits & Inspections Tim Ryce Assistant Manager, Permits & Inspections Mike van der Laan Green Building Research Analyst, Permits & Inspections

2 Outline for Tonight Builders Forum Introduction (5 min) Overview of Changes (10 min) Envelope (15 min) HVAC / SWH (5 min) 9.32 Ventilation (15 min) Compliance Options (10 min) CNV Bylaw Amendments (10 min) Closing Remarks (5 Min)

3 The Builders Forum Opening Remarks

4 An Overview of the Changes

5 BCBC Energy Requirements (current to December 18, 2014)

6 BCBC Energy Requirements (as of December 19, 2014)

7 What is Section 9.36? Mid-stream amendment to the 2012 BC Building Code ~110 pages Multiple pathways to compliance Several options for specific building types Systems approach to prescriptive req s Performance-based options available

8 The Magic of Section 9.36 Treats the building as a system Enables performancebased design Removes barriers for new technologies

9 Compliance Paths Single Family Home Current to Dec. 18, 2014 Prescriptive path In-cavity Insulation Table Performance path EnerGuide model 77 As of Dec. 19, 2014 Prescriptive path Effective R-value Table Trade-off Options with / without HRV Performance path #1 EnerGuide model better than reference building Performance path #2 NECB

10 Compliance Paths Small Industrial (Automotive/Woodworking) Current to Dec. 18, 2014 Prescriptive path In-cavity Insulation Table As of Dec. 19, 2014 Performance path National Energy Code for Buildings (NECB)

11 Additional attention to detail at design stage Possible expansion of design team A whole new Code to purchase, understand, and apply Additional items in Building Permit submission A new normal What It Means For Designers / Builders

12 The Building Envelope BCBC

13 Building Envelope Scope + Application Focus is on total building performance, not just thermal insulation Heat transfer and air leakage between conditioned space and unconditioned space Windows must conform to Section 9.7 Properties of insulation, location and installation of air barriers, and vapour barriers must conform to Section 9.25

14 Effective R-Value

15 Effective R-Value Included Repetitive structural members - Studs - Joists, lintels - Sills, plates Credit for adjoining unconditioned spaces Excluded from Calculations Minor penetrations - pipes, ducts - Packaged air conditioners - Shelf angles, anchors, fasteners Major structural penetrations - Balcony slabs, beams, columns, ornamentation, Provided: insulation is tight to penetrating element - Total area of all major structural penetration is limited to max 2% of wall area

16 Effective R-Value Assembly Conventional 2x6 wood 16 o/c; R-20 batt insul; gyp bd interior; ply sheathing; wood siding Advanced 2x6 framing, 24 o/c, R-20 batt insul 2x4 wood 16 o/c; R12 batt insul; plus R-10 XPS, gyp bd interior; ply sheathing; wood siding Nominal R-value 20 (RSI 3.52) 20 (RSI 3.52) 22 (3.87) Effective R-value 17.2 (RSI 3.02) 18.2 (RSI 3.20) 22.4 (RSI 3.94) 2x6 steel 16 o/c, ; R-20 batt insul.; gyp bd interior; ply sheathing; wood siding 20 (RSI 3.52) (RSI 1.99)

17 Effective R-Value Look-up tables for common assemblies, and information on how to calculate others ( ) Calculator - Canadian Wood Council Wall Thermal Design Calculator

18 Effective R-Value

19 Continuity of Insulation

20 Continuity of Insulation Insulation must be continuous across the entire envelope but this does not mean continuous insulation across face. Another measure to reduce Thermal Bridging Applies to building components such as partitions, chimneys, fireplaces, and columns and beams along exterior walls, but not to stud framing and ends of joists (accounted for by effective R-value calculation).

21 Continuity of Insulation

22 Airtightness

23 Airtightness 9.25 currently requires an airtight building envelope 9.36 addresses construction of air barrier details because of the heat loss implications. Testing is NOT required. Air barriers must be continuous: across joints, between assemblies, and around penetrations.

24 Airtightness Joints in panel-type air barrier materials must be sealed by: Caulking, Sealants, Spray foam Gaskets Tapes

25 Airtightness Flexible sheet air barrier materials require all joints to be: lapped at least 50 mm (2 ), sealed, and structurally supported Sealants must be nonhardening

26 Airtightness

27 HVAC + Service Water Heating BCBC BCBC

28 HVAC + Service Water Heating Scope + Application Heating systems must be designed in accordance with good practice (as per 9.32 & 9.33) Systems not referenced in 9.36 must be designed in accordance with requirements of the NECB Heating and air-conditioning equipment must be located inside the conditioned space, unless it is designed to be located outside Equipment efficiency set out in Table (HVAC) and Table (Service Water Heating)

29 HVAC + Service Water Heating Continuity of Insulation All piping/ducts must be located inside the conditioned space. If located outside or within an exterior wall, the piping/ducts must be insulated to same level as required for above grade walls

30 HVAC + Service Water Heating Continuity of Air Barrier Ducts outside the heated envelope, or within an exterior assembly: All joints in the ducts must be sealed with sealant, mastic, or foil faced tape Fabric duct tape is not permitted

31 HVAC + Service Water Heating Temperature Controls Heat pumps with supplementary heaters controls should prevent operation of supplementary heater when the heat pump can supply the full heat load Heating & cooling systems with separate controls must prevent both cooling & heating to be activated simultaneously Heating systems must allow for zone controls either manually or automatically

32 HVAC + Service Water Heating Hot Water Piping The first 2 m of piping from a storage tank or heater must be insulated with pipe insulation If hot water piping system has recirculation, the entire system must be insulated. If piping is located outside the heated envelope, it must be insulated to no less than the effective R-value of exterior walls.

33 Ventilation BCBC BCBC 9.32

34 Ventilation Scope + Application Exhaust only ventilation no longer acceptable New Principal Fan Sizing Rule Ventilation air must be distributed to each bedroom and a common area 4 acceptable options Principal System must run continuously Crawlspace Ventilation Required Credit for very short bath fan exhaust ducts

35 Ventilation Principal Ventilation System Exhaust Fan Based on bedroom count & square footage Minimum exhaust fan air-flow rate in Table Minimum air flow rate, L/s Floor area m 2 Number of bedrooms >7 < >

36 Ventilation Kitchen & Bath Fans Principal exhaust fan 50 Pascals Designed to run continuously Controlled by dedicated switch Clearly marked principal Ventilation Exhaust Fan Two settings: on & off Accessible for servicing If capable of running at multiple flow rates, must have a separate switch so low rate is not less than required Sound rating not to exceed 1.0 sone

37 Ventilation Kitchen & Bath Fans Exhaust must be installed in every kitchen and bathroom Unless these are served by principal ventilation system, the Minimum flow rate is as per Table Capacity rating at 50 Pascals Room Minimum Exhaust Fan Flow Rate L/s Intermittent Continuous Kitchen 47 N/A Bathroom 23 9

38 (2) Supply with Forced Warm Air Heating Principal exhaust fan sized to Table ; continuous operation Furnace fan must run continuously Supply air drawn into furnace return; limits on supply duct

39 (3) HRV Supply with Forced Warm Air Heating

40 (4) Independently Distributed HRV System Dedicated supply ducts to each bedroom and to each floor At least one exhaust located 2 m above upper floor

41 (6) Passive Supply Only applicable to one storey dwelling (<168 m2 with no forced air heating) Passive inlets must be a min. 1.8m above floor Each bedroom must have one inlet with unobstructed vent area of 100 sq cm At least one common area must have an inlet

42 Ventilation Heated crawlspace ventilation If crawlspace is heated by ducted forced air heating, it must be connected to floor above by at least one transfer grille for each 30m2 of crawlspace area Note: Crawlspace ventilation in this section must not be confused with exterior ventilation of unheated crawlspace

43 Ventilation Ducts Exhaust ducts must discharge to outdoors Exhaust and supply ducts: Must be sized as required by manufacturer & equivalent diameter as per Table (3) Need to be air-sealed Insulated & provided with vapour barrier

44 Compliance Part 9 Building Energy Regulations in BC

45 Compliance Part 9 Building Energy Regulations in BC Effective December 19, 2014

46 Compliance Higher Energy Efficiency

47 Compliance Requirements for all Pathways Drawing Submission Design Verification Report Higher Energy Performance

48 Compliance Requirements for all Pathways Drawing Submission Design Verification Report Higher Energy Performance

49 Compliance to Prescriptive with trade-offs ( ) Design Verification Report 1.

50 Compliance Options Performance Pathway Reference house Assumes house design using all applicable prescriptive requirements Same fuel, occupancy, set-points, service hot water demand, climate data same as the Proposed house 2.5 air 50 Pascals airtightness Fenestration area and orientation to be modeled as being equally distributed on all sides fenestration to wall area ratio limited House energy target Annual energy consumption of reference house includes space conditioning and service water heating Higher Energy Performance

51 Compliance Performance Pathway House Performance Report (Pre-Construction) Design Verification Report Higher Energy Performance

52 Compliance Requirements for CNV Energy Performance Commitment House Performance Report (Pre-Construction) + (As-Built) Design Verification Report Higher Energy Performance

53 Green Building Zoning Amendments Adopted on October 27, 2014 Public Hearing Presentation

54 The Builders Forum Closing Remarks City of North Vancouver Builders Forum HPO Illustrated Guide to Energy Efficiency Requirements Canada Wood Council Effective R-Value Calculator Building Envelope Thermal Bridging Guide Pathways to High-Performance Housing in British Columbia BOABC additional training and education