National Construction Code Building Code of Australia (2019)

BCA Assessment Report - Section J (using BCA 2016 as permitted under transition arrangements)

Proposed alterations and additions to an existing building (guesthouse accommodation) - Duntryleague Mansion, Woodward Street, Orange.

Prepared for designs@m

Report No: 19032 Version: A Date prepared: 1010512019 Report author: Marc Kiho

B.Tech (Civil), Dip.EHBS

Kiho Building Consulting PO Box 1732 Orange NSW 2800 - P: 0400 680 815 - E: energy_rating@bigpond.com Building Code of Australia Section J BASIX & NatHERS

Register

Issue No Remarks Date A CC issue 10/05/2019

Introduction

This Section J - Energy Efficiency report has been prepared for designs@m and refers to the proposed alterations and additions to an existing commercial building (guesthouse accommodation) at the Duntryleague Mansion, Woodward Street, Orange.

The report is based on, and limited to, the information shown on the following documentation:

Drawing no. 123950 sheets 47E & 480.

Exclusions This report does not include:

Assumptions regarding the design intention or the like (except as noted in the report). An assessment of sections A through to Hof the Building Code of Australia (2019).

Report Format

The report identifies the parts of Section J of the Building Code of Australia (2019) relevant to the project as summarised in the following table (see below). The report is based on Section J BCA2016 as permitted under transition arrangements.

The prescriptive BCA requirements and status of each of the relevant parts is discussed in the following body of the report.

Building description

• Proposed alterations and additions to an existing commercial building (guesthouse accommodation) at the Duntryleague Mansion, Woodward Street, Orange.

• BCA Building Classification - 3 and 6

• Floor area - 1,280m2 (ground floor restaurant/ meeting rooms & 2 floors accommodation)

• BCA climate zone - 7

• The construction of new external building fabric (walls / floors / ceilings) will require full compliance with Section J.

• The existing building is undergoing an internal renovation and therefore full compliance with Section J is not deemed appropriate nor possible. The existing glazing and external wall construction does not comply with Section J due to the age of the building and type of construction.

• It is considered that the existing building will meet the relevant performance requirements of JP1 (ie reduced energy demand) and therefore achieve compliance with Section J by addressing the following:

o Draught proofing of all external doors; and o Installing ceiling insulation to R3.5 (where access is available); and o Installation of Section J compliant energy efficient lighting (fluorescent / LED) and

lighting controls; and o Installation of energy efficient package air conditioners and ventilation systems.

• The above are addressed in the following Section J analysis and summary table located at the end of the report.

• The prescriptive BCA requirements and status of each of the relevant parts is discussed in the following body of the report.

Application of Section J - Energy Efficiency Parts of the existing building are undergoing an internal refurbishment and due to the age of the building and construction full deemed to satisfy compliance with Section J is not considered reasonable, cost effective nor practical.

At the time of construction of the building (circa 1870) building regulations did not consider thermal performance requirements. The existing glazing areas and glass types do not comply with current Section J thermal properties. The building has existing wall, floor and ceiling construction that is generally uninsulated or has insulation present of an unknown R value.

There is a very minimal overall increase in glass area in the building associated with the alterations and additions. For the new glazing to comply with current Section J requirements it is likely to require the installation of tinted or high-performance double glazing with thermal specifications that are not readily commercially available and may impact on heritage values.

The following broad principles are considered when applying Section J to existing buildings constructed prior to the introduction of minimum levels of energy performance in 2006:

1. The new work must comply unless legislation exempts the building to some degree (such as heritage buildings) or legislation permits the building control authority to exercise discretion; and

2. The existing building and its services must be made to comply where required by legislation; and

3. The new work must not reduce the existing buildings level of energy efficiency below that which was required by the BCA at the time of its construction or its most recent work; and

4. The new work should not reduce the existing buildings level of energy efficiency even if it were constructed prior to energy efficiency provisions being introduced into the BCA; and

5. The energy efficiency of the existing space, or the services directly associated with the new building work should be improved if the improvement is reasonable, cost effective and practical.

(ABCB Handbook - Applying energy efficiency provisions to new building work associated with existing class 2 to 9 buildings - 2010).

Principles 1 and 2 above require discretion to be exercised by the building control authority given the particular characteristics of the existing building and the type and extent of works being carried out, as full compliance with the current BCA energy efficiency requirement is

impossible to achieve in the existing building without significant demolition and reconstruction works taking place.

It is considered that principles 3 to 5 will meet the relevant performance requirements of JP1 (ie reduced energy demand) and therefore achieve compliance with Section J by addressing the following:

o Draught proofing of all external doors; and o Installing Section J compliant R3.5 ceiling insulation; and o Installation of thermally efficient windows (timber framed to reduce conduction); and o Installation of Section J compliant energy efficient lighting (fluorescent / LED) and

lighting controls; and o Installation of energy efficient package air conditioners and ventilation systems.

As the proposed new windows result in a very minimal overall increase in glass area, the use of single glazed clear glass in timber frames will not result in any measurable reduction in the energy efficiency of the existing building.

The above are addressed in the following Section J analysis and summary table located at the end of the report.

Section J - Energy Efficiency

BCA Section J - parts Referenced Comment

J1 .2 - thermal construction aeneral y compliance readily achievable J1 .3 - roof and ceilina construction y compliance readily achievable J1 .4 - roof liqhts N n/a - not present J1 .5 - walls y compliance readily achievable J1 .6 - floors y compliance readily achievable J2.4 - glazing y compliance readily achievable J2.5 - shadina y compliance readily achievable J3.2 - chimnevs and flues y compliance readily achievable J3.3 - roof liahts N n/a - not present J3.4 - windows and doors y compliance readily achievable J3.5 - exhaust fans y compliance readily achievable J3.6 - construction of roofs, walls and floors y compliance readily achievable J3. 7 - evaoorative coolers N n/a - not present J5.2 - air-conditionina svstems y compliance readily achievable J5.3 - mechanical ventilation svstems N n/a - not present J5.4 - miscellaneous exhaust svstems N n/a - not present J6.2 - artificial liahtina y compliance readily achievable J6.3 - interior artificial liahtina and oower control y compliance readily achievable J6.4 - interior decorative and disolav liahting N n/a - not present J6.5 - artificial liahtina around the building perimeter y compliance readily achievable J6.6 - boilina water and chilled water storage units y compliance readily achievable J?.2 - heated water suoolv y compliance readily achievable J?.3 - swimmina pool heatina & pumping N n/a - not present J?.4 - spa oool heatina and ournoino N n/a - not present JB.3 - facilities for enerav monitorina y compliance readily achievable

Section J - Energy Efficiency Assessment .:... Analysis The parts identified in the previous table are further analysed and comments regarding the project are included in italics and bold.

A summary sheet is included which should be attached to the drawings and read in conjunction with this report.

BCA Reference Prescriptive BCA requirements / comments

J1 .2 Thermal general

Construction Where required, insulation must comply with AS/NZS 4859.1 and be installed so that it abuts or overlaps adjoining insulation and forms a continuous barrier with ceilings, walls, bulkheads, floors or the like.

Compliance to be certified during construction.

J1 .3 Roof and Ceiling The new areas of ceiling (with roof space above) require a total R- Construction value of 3.7 for an upward direction of heat flow. This can be achieved

by the following:

• Installation of R3.5 bulk insulation above the ceiling (new areas of construction and existing ceilings where access is available).

Note: recessed lighting will reduce the effectiveness of ceiling insulation. Contact author of report for advice if recessed lighting is proposed.

Compliance to be certified during construction.

J 1.5 Walls The new external walls and walls adjoining roof space require minimum total construction A-values as follows:

Clad framed external walls (R2.8): • Installation of R2.7 bulk insulation within a minimum 90mm

framed wall and vapour permeable sarking fixed to outside of framed wall beneath cladding.

Framed walls adjoining roof space (R2.8): • Installation of R2.7 bulk insulation within a minimum 90mm

framed wall.

Compliance to be certified during construction.

J1 .6 Floors The proposed new ground floor construction consists of a concrete slab on ground. Insulation will not be necessary as heating I cooling is not proposed to be installed within the slab.

J2.4 Glazing The following generic thermal performance values are specified for all new windows in the building:

Timber framed windows and doors: Total U value (NFRC) = 6.0 (U values lower than this value are satisfactory)

Total SHGC value (NFRC) = 0.60 (SHGC values -or- 10% of this value are satisfactory)

J3.2 Chimneys & flues The following draught sealing is required for chimneys in the function areas and accommodation rooms:

• Fully sealed or capable of being sealed by an operable damper I flap.

Compliance to be certified during construction.

J3.4 External Windows and The following draught sealing is required: Doors

• A foam seal around the perimeter of the frame and a draught stopper along the bottom edge of external doors.

• External doors to be fitted with a self-closer. • New windows to comply with AS2047.

Compliance to be certified during construction.

J 3.5 Exhaust fans The following draught sealing is required:

• Any exhaust fans in the bathrooms must be fitted with a self­ closing damper or the like.

Compliance to be certified during construction.

J3.6 Construction of roof, walls and floors

Construction of the conditioned spaces using plasterboard lined walls and ceilings with cornices, skirting and architraves will achieve draught sealing compliance.

J 5.2 Air-conditioning systems It is assumed that space heating and cooling to the accommodation areas will be provided by package air-conditioner/s.

The following specifications are applicable for air-conditioners:

• max 35 kWr for any single unit; • COP I EER for AC units to be in excess of 2.80; • All supply and return ductwork I refrigerant piping insulated to

R2.0 and sealed (R3.0 where exposed to sunlight); • when serving more than 1 zone, thermostatically control the

temperature of each zone in accordance with J5.2a)(i)(B); • to be deactivated when the building is not occupied and

controlled by a separate time switch complying with specification J6 (for each AC unit > 1 OkWr capacity Q! heater of >10kW heating capacity).

• To be deactivated in each accommodation room when an external door is left open for more than 1 minute.

Note: Any new air-conditioning system requires certification by a Mechanical Engineer where the size of the air-conditioner is greater than 35kWr. For smaller package or split systems the motor efficiency performance is controlled under the Australian Governments Minimum Energy Performance Standards (MEPS).

Compliance to be certified during construction.

J6.2 Interior Artificial Lighting The aggregate maximum illumination power density must not exceed the following (except as allowed by adjustment factors from table J6.2c where motion detectors, dimming, daylight sensors or room size allows). See author of report for upgrade calculations if limits noted below are unachievable -

• Entry lobby: 15W / sq.m.

• Corridor areas: 8W /sq.m.

• Lounge areas I storage areas: 10W / sq.m.

• Restaurant areas: 18W / sq.m.

• Accommodation rooms: 6W /sq.m.

• Staff I toilet areas: 6W I sq.m. (240 W maximum)

The above wattage allowances generally limit all fixed lighting to low wattage fluorescent or LED sources.

The following is exempt from the above: • Emergency lighting required by part E4: • Lighting of a specialist process nature.

Compliance to be certified during construction.

J6.3 Interior artificial lighting Artificial lighting to the above areas must incorporate the following: and power control

• Light switches to be in a visible location for each room or space being illuminated;

• An occupant activated device such as a room security device, motion detector, card reader, card switch or the like is to be installed to cut power to lighting, air-conditioner, exhaust fan and bathroom heater (if present) when the accommodation area is unoccupied.

The following is exempt from the above: • Emergency lighting required by part E4; • Lighting for a specialist 24 hour process.

Compliance to be certified during construction.

J6.5 Artificial Lighting around New artificial lighting around the perimeter of the building must: Perimeter of Building

• Be controlled by a daylight sensor or time switch (complying with spec J6), and

• When the total perimeter lighting load exceeds 1 OOW - o Must have an average light source efficacy of not less

than 60 Lumens/W; or o Be controlled by a motion sensor

• When used for facade or signage lighting have a separate time switch.

Emergency lighting required by part E4 is exempt from the above.

Compliance to be certified during construction.

J6.6 Boiling water and chilled The following power control shall be used on any boiling water or water storage units chilled water storage units in the staff areas (if installed):

• Power to be controlled by a time switch.

Compliance to be certified during construction.

J7.2 Heated water supply The following energy efficiency requirements are necessary for sanitary heated water supplies:

• Designed and installed in accordance with Part 82 of NCC Vol. 3 (Plumbing Code of Australia).

Compliance to be certified during construction.

J8.3 Facilities monitoring

for energy The following facilities for energy monitoring are required:

• Gas and/or electricity meters (assumed to be existing).

• Sub metering is not required.

Section J BCA requirements - Ountryleague Mansion, Woodward Street Orange (to be read in conjunction with Section J report)

Insulation (new areas ol construction only)

Ceilings: R3.5 External walls: R2.7 bulk insulation and sarking Internal walls adjoining roof space: R2 7 bulk msulanon Floor: nil

External windows & glass doors (new areas of construction only) U=6.0 SHGC=0.60 Glazing to comply with AS2047

Draught sealing External doors to have foam seal around perimeter, draught stopper along bottom edge and self-closer. Bathroom exhaust fans to be fitted with a self-closing damper Chimneys to be fitted with self-closing damper or sealed.

Air conditioning (new areas of construction only) Maximum of 35kWr for any single AC unit Minimum COP/EER of 2.80 Ductwork and refrigerant piping to be insulated to R2.0 (R3.0 where exposed to sunlight) When serving more than 1 zone, thermostatically control the temperature of each zone in accordance with J5.2(a)(i)(B) All AC units with a heating or cooling capacity of more than 1 OkWr to have a time switch controller (refer to spec J6 of BCA for details) To be deactivated in each accommodation room when an external door 1s open for more than 1 minute

Internal lighting Entry lobby - maximum illumination power density of 15 W/m2 Lounge areas I storage areas areas - maximum illumination power density of 10 W/m2. Corridors - maximum illumination power density of 8 W/m2 Restaurant- maximum illumination power density of 18 W/m2 Accommodation rooms maximum illumination power density of 6 W/m2 Staff/ toilet areas maximum illumination power density of 6 W/m2 An occupant activated device such as a room security device, motion sensor, card reader, card switch or the like is to be installed to cut power to lighting, air-conditioner. exhaust fan and bathroom heater (if present) when a motel unit is unoccupied

External lighting

All new external lighting to be controlled by either a daylight sensor or time switch and where total perimeter lighting exceeds 100W have a light source efficacy not less than 60 lumens/W or be controlled by a motion sensor

Facade lighting or illuminated signs to be controlled by a time switch

Hot water supply Heated sanitary water systems to be designed and installed as per part 82 NCC vol 3

Boiling/ chilled water units (if any) To be controlled by a time switch

Metering of gas/ electricity Electricity and gas meters (assumed to be existing) Sub metering is not required