Major Texas Energy Code Changes (CZ3) TexEnergy Solutions August 30 th, 2016

Transcription

1 Major Texas Energy Code Changes (CZ3) TexEnergy Solutions August 30 th, 2016

2 Goals for today To give an overview of the Energy Code changes coming to Texas per Texas State Law. Will focus on IRC and Residential provisions of IECC

3 Givens Discussing 2015 IRC/2015 IECC Residential as amended in HB Municipalities will make their own revisions but what and how is currently unknown Residential requirements of the 2015 IECC changed very little from 2012 IECC.

4 Givens Adoption of 2015 IRC / 2015 IECC & 2015 IMC (in combination) will require mechanical outside air ventilation systems be provided in all new homes. Requirements of the outside air dictated by mechanical code not energy code.

5 IECC Pathways Currently (2009 IECC) Prescriptive Performance As of Sept (2015 IECC) Prescriptive Performance Energy Rating Index ENERGY STAR ENERGY STAR

6 IECC Pathways Currently (2009 IECC) Prescriptive Performance As of Sept (2015 IECC) Prescriptive Performance Energy Rating Index ENERGY STAR ENERGY STAR

7 Prescriptive Path Overview Mechanical outside air More stringent envelope R-values Mandatory Blower Door test (3ACH target) Tighter windows Mandatory Duct Leakage with tighter duct systems (4 CFM per 100 Sq.Ft. of enclosure) Tighter air-handlers/furnaces Hot water pipe insulation Minimum 75% high-efficacy lighting

8 Prescriptive Path Envelope Insulation Table R IECC (CZ 3) 2015 IECC (CZ 3) Ceiling R30 Ceiling - R38 Wall (wood) R13 Wall (wood) R20 or R13+5 cont Wall (mass) R5 cont or R8 cavity Wall (mass) R8 cont or R13 cavity Floor R19 Floor R19 Wall (basement & crawlspace) R5 cont or R13 cavity Wall (basement & crawlspace) R5 cont or R13 cavity

9 Prescriptive Path Envelope Insulation Table R Wall Insulation (CZ3) R20 larger slab or less CFA R13+5 larger brick ledge Insulated Headers R3 per inch Cavities within corners R3 per inch

10 Prescriptive Path Envelope Insulation R-20 wall image R13+5 wall image

11 Prescriptive Path Envelope Fenestration Table R IECC (CZ 3) Windows U = IECC (CZ 3) Windows U = 0.35 Skylight U = 0.65 Skylight U = 0.55 Both SHGC = 0.30 Both SHGC = 0.25

12 Prescriptive Path Envelope Fenestration

13 Prescriptive Path Envelope Infiltration R IECC (CZ 3-8) Air-sealing Inspection (Mandatory) 2015 IECC (CZ 3-8) Air-sealing Inspection (Mandatory) Blower Door test 7 ACH (Optional) Blower Door test 3 ACH (Mandatory)

14 Prescriptive Path Envelope Air Sealing 2009 IECC Table

15 Prescriptive Path Envelope Air Sealing 2015 IECC Table R

16 Prescriptive Path Envelope Air Sealing Additional airsealing options

17 Prescriptive Path Envelope Air Sealing Sealed kneewall

18 Prescriptive Path Envelope Air Sealing Overview Air sealing measures listed in Code are substantially the same Major changes include Kneewalls shall be sealed Skylights sealed to framing Additional air-sealing beyond the prescriptive list in Code will be required to meet the 3 ACH target

19 Prescriptive Path Envelope - Other 2009 IECC 2015 IECC Sunrooms no requirements in CZ 3 Sunrooms - must be thermally isolated (R ) Dynamic Glazing not covered Dynamic Glazing (R ) Wood-burning fireplaces shall have gasketed doors and outdoor combustion air Fenestration air leakage no requirement Rooms containing fuel-burning fireplaces no requirement Wood-burning fireplaces - shall have tight-fitting flue dampers or doors, and outdoor combustion air (R ) Fenestration Air Leakage new infiltration limit rating requirement (R ) Rooms containing fuel-burning appliances must be sealed and isolated (R )

20 Prescriptive Path Envelope - Other Dynamic glazing Window air-leakage

21 Prescriptive Path Systems Duct Leakage R IECC (CZ 3) Rough-in Test Total Leakage Test 6 CFM per 100 SF of enclosure 2015 IECC (CZ 3) Rough-in Test Total Leakage Test 4 CFM per 100 SF of enclosure Postconstruction Test Leakage to Outside Test 8 CFM per 100 SF of enclosure Postconstruction Test Total Leakage Test 4 CFM per 100 SF of enclosure Postconstruction Test Total Leakage Test 12 CFM per 100 SF of enclosure Postconstruction Test Leakage to Outside Test not allowed

22 Prescriptive Path Systems Duct Leakage R CFM per 100 ft

23 Prescriptive Path Systems - Mechanical (Table R ) 2009 IECC (CZ 3) Sealed air handlers Not required 2015 IECC (CZ 3) Sealed air handlers - 2% leakage when tested by manufacturer (R ) Building cavities shall not be used as supply ducts Mechanical ventilation fans - No efficacy requirement Mechanical ventilation fans No requirement Heating and cooling equipment sized in accordance with M of the IRC Building cavities shall not be used as ducts or plenums (R ) Mechanical ventilation fans shall meet the efficacy requirements of Table R Mechanical ventilation fans that are integral to the HVAC equipment shall be powered by an ECM motor (R ) Heating and cooling equipment sized in accordance with ACCA Manual J & S (R403.7)

24 Prescriptive Path Systems - Mechanical Building cavities shall not be used as ducts or plenums (R )

25 Prescriptive Path Systems - Mechanical Mechanical ventilation fans shall meet the efficacy requirements of Table R

26 Prescriptive Path Systems - Mechanical Mechanical ventilation fans that are integral to the HVAC equipment shall be powered by an ECM motor (R )

27 Prescriptive Path Systems - Other 2009 IECC (CZ 3) Hot water pipe insulation Not Requried 2015 IECC (CZ 3) Hot water pipe insulation R-3 pipe insulation on: ¾ piping (inside envelope) Piping outside conditioned space Piping to a distribution manifold Piping located under the slab Buried in piping (R ) Lighting 50% high-efficacy (R404.11) Lighting 75% high-efficacy (R404.11)

28 Prescriptive Path Mandatories (no change from 2009) 2015 IECC Envelope (with UA trade-offs) (R402.1) Wall vapor retarded per R702.7 of the 2015 IRC (R ) Eave baffles (R ) Insulated access hatches and doors (R ) Sunroom Isolation (R ) Envelope Air Leakage at 3 ACH (R ) Wood-burning fireplaces shall have tight-fitting flue dampers or doors and outdoor combustion air (R ) Windows, skylights and sliding doors hall have air infiltration rate of no more than 0.3 cfm per square foot and swinging doors no more than 0.5 cfm per square foot (R ) Fuel burning appliances shall be located outside of isolated from inside the thermal envelope (R ) IC-rated recessed lighted sealed to envelope (R )

29 Prescriptive Path Mandatories (cont.) Programmable thermostat (with heat pump supplement heat as applicable) (R &.2) R-8 ductwork outside conditioned space (R ) Airhandlers have manufacture s designation for air leakage of no more than 2% (R ) Duct leakage testing (4 CFM per 100 Sq.Ft. of enclosure) (R ) Building cavities shall not be used as ducts or plenums (R ) Mechanical system piping insulation shall be insulated to R-3 (R403.4) Manual J and S calculations (R403.7)

30 Prescriptive Path Mandatories (cont.) Heated water recirculation systems (R ) Hot water pipe insulation R-3 pipe insulation (R ) ¾ piping Piping outside conditioned space Piping to a distribution manifold Piping located under the slab Buried in piping Residential pools and spas (R ) 75% high-efficacy lighting (R404.1)

31 Prescriptive Path Mandatories (cont.) Outdoor intakes and exhausts shall have automatic or gravity dampers that close when the ventilation is not operating R403.6) Mechanical ventilation fans shall meet the efficacy requirements of Table R Mechanical ventilation system fans that are integral to the HVAC equipment shall be powered by ECM motors (R )

32 Required Documents Prescriptive

33 IECC Pathways Currently (2009 IECC) Prescriptive Performance As of Sept (2015 IECC) Prescriptive Performance Energy Rating Index ENERGY STAR ENERGY STAR

34 Performance Path Overview

35 Performance Path Overview Mechanical outside air More stringent envelope R-values (with small tradeoffs allowed) Mandatory Blower Door test (3 ACH) Tighter windows Mandatory Duct Leakage with tighter duct systems (target determined my model) Tighter air-handlers/furnaces More high-efficacy lighting (% determined by model) Negligible trade-offs for using more efficient HVAC or Water-heating equipment

36 Performance Path Mandatories 2015 IECC Envelope (with UA trade-offs) Envelope Air Leakage at 3 ACH (R ) Wood-burning fireplaces shall have tight-fitting flue dampers or doors and outdoor combustion air (R ) Windows, skylights and sliding doors shall have air infiltration rate of no more than 0.3 cfm per square foot and swinging doors no more than 0.5 cfm per square foot (R ) Fuel burning appliances shall be located outside of isolated from inside the thermal envelope (R ) IC-rated recessed lighted sealed to envelope (R )

37 Performance Path Mandatories (cont.) Programmable thermostat (with heat pump supplement heat as applicable) (R &.2) Air-handlers have manufacture s designation for air leakage of no more than 2% (R ) Duct leakage testing (target determined by model) (R ) Building cavities shall not be used as ducts or plenums (R ) Mechanical system piping insulation shall be insulated to R-3 (R403.4) Manual J and S calculations (R403.7)

38 Performance Path Mandatories (cont.) Heated water recirculation systems (R ) Residential pools and spas (R ) Minimum 75% high-efficacy lighting (R404.1)

39 Required Documents- Performance Affidavit and performance testing results and

40 IECC Pathways Currently (2009 IECC) Prescriptive Performance As of Sept (2015 IECC) Prescriptive Performance Energy Rating Index ENERGY STAR ENERGY STAR

41 ERI Path Overview New compliance path for the IECC ERI = HERS Index (Additional options will be on the market by Sept 2016) Per 2015 IECC as written ERI = 51 in CZ 3 ERI score starts at 65 (but ratchets down) Minimum 2009 IECC Envelope All Code Mandatories still apply Allows trade-offs on equipment efficiency that otherwise are not allowed in the Prescriptive or Performance Paths The bigger the house, the better this works!

42 ERI Path Mandatories 2009 IECC Envelope (without UA trade-offs) Envelope Air Leakage at 3 ACH (R ) Wood-burning fireplaces shall have tight-fitting flue dampers or doors and outdoor combustion air (R ) Windows, skylights and sliding doors hall have air infiltration rate of no more than 0.3 cfm per square foot and swinging doors no more than 0.5 cfm per square foot (R ) Fuel burning appliances shall be located outside of isolated from inside the thermal envelope (R ) IC-rated recessed lighted sealed to envelope (R )

43 ERI Path Mandatories (cont.) Programmable thermostat (with heat pump supplement heat as applicable) (R &.2) Airhandlers have manufacture s designation for air leakage of no more than 2% (R ) Mandatory Duct Leakage with tighter duct systems (target determined my model) Building cavities shall not be used as ducts or plenums (R ) Mechanical system piping insulation shall be insulated to R-3 (R403.4) Hot water Pipe Insulation (R ) Manual J and S calculations (R403.7)

44 ERI Path Mandatories (cont.) Heated water recirculation systems (R ) Hot water pipe insulation R-3 pipe insulation (R ) ¾ piping Piping outside conditioned space Piping to a distribution manifold Piping located under the slab Buried in piping Residential pools and spas (R ) Minimum 75% high-efficacy lighting (R404.1)

45 ERI Path Mandatories (cont.) Outdoor intakes and exhausts shall have automatic or gravity dampers that close when the ventilation is not operating R403.6) Mechanical ventilation fans shall meet the efficacy requirements of Table R Mechanical ventilation system fans that are integral to the HVAC equipment shall be powered by ECM motors (R )

46 ERI Path Impacts Using AHU with ECM motor is not a significant measure to lower ERI Inline fan (reduction by 2-5 points)

47 Required Documents- ERI At Permit For CO

48 IECC Pathways Currently (2009 IECC) Prescriptive Performance As of Sept (2015 IECC) Prescriptive Performance Energy Rating Index ENERGY STAR ENERGY STAR

49 ENERGY STAR Path Overview ENERGY STAR for Homes 3.0 Rev. 08 will be in effect Compliance based on HERS score (similar to ERI) Required HERS score is not a 52 or 65 for all homes but varies for every home based on it s specific design and location. ESv3 checklists and EPA/RESNET oversight do apply. In Sept. 2017, ENERGY STAR will move to ESv3.1

50 ENERGY STAR Path Overview ESv3 Rev 08 Changes Prescriptive Path removed (no one was using it) Water Management Checklist responsibility moved from Rater to Builder

51 ENERGY STAR Path Overview ESv3 Rev 08 Changes - HVAC HVAC Designer must now use per County design temperatures specified by ENERGY STAR Rules for HVAC group design codified HVAC Sizing limits clarified %s for allowable oversizing increased but next nominal size allowance removed HVAC paperwork split into Design and Commissioning Checklists HVAC Design Paperwork should to be reviewed by Rater prior to construction HVAC Commissioning Paperwork can be turned in after closing (reduces paperwork holdups)

52 ENERGY STAR Path Overview ESv3 Rev 08 Changes - HVAC HVAC Contractor required to submit HVAC Design Checklist to Rater HVAC is still required to produce items below but Rater can elect to not collect them HVAC Commissioning Checklist Full load calculations AHRI matchups Separate ventilation calculations Balancing Report

53 Required Documents- Energy Star For Permit For CO

54 Changes to the HERS Index Overview Impacts ENERGY STAR and ERI Implementing July 1, 2016 Aligning back-end calculations with 2015 IECC ERI rules Credit given for Water Efficient Fixtures and Layouts Ventilation calculations rules clarified Implementing in New Quality Assurance structure

55 Changes to the HERS Index Overview Impacts ENERGY STAR and ERI Alignment with the 2015 IECC ERI rules Typically will raise HERS scores by 0 to 6 points Credit for Water Efficient Fixtures and Layouts Typically will lower HERS scores by 0 to 1 point Ventilation calculations rules being clarified Could raise HERS scores depending on Rater and ventilation type 0-3 points Systems using AHU as Mechanical Outdoor Air strategy will see biggest increases

56 Changes to the HERS Index Overview Impacts ENERGY STAR and ERI New Quality Assurance structure in Goal is to increase consistency in HERS Index between Raters and Areas Could increase cost of Ratings

57 Additional Paths Alternative pathways along with ENERGY STAR could be available by Sept. 2016

58 Sampling What is it? Pre-analysis of building plans meeting the intended qualifications & Subsequent random testing and inspections *as defined by RESNET

59 Is Sampling allowed? It Depends Not for: prescriptive, performance, and ERI compliance pathways All performance tests and each measure shall be inspected by the code official or approved 3 rd party (R104.2, R104.4) Performance compliance report: batch sampling to determine compliance shall be prohibited (R ) Energy Star - Raters who operate under a Sampling Provider are permitted to verify the Minimum Rated Features of the home and to verify any Checklist Item designated Rater Verified using the RESNETapproved sampling protocol

60 Questions

61 Resources Free online version of 2015 IRC DOE Builder America Solution Center ENEGY STAR for Homes Green Built Texas

62 Contact Info Robert Pegues Jeff Bentley Eric Johnson Steve Saunders