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Oakdale Primary School, Expansion Project Sustainability Statement

1 Hamson Barron Smith Tel: 01444 449400 www.hamsonbarronsmith.com

Peterborough City Council Oakdale Primary School – Expansion Project

Sustainability Statement

May 2017

ver. author date checked comment

1 KA 2017-05-19 TC Issued for Planning Approval

Oakdale Primary School, Expansion Project Sustainability Statement

2 Hamson Barron Smith Tel: 01444 449400 www.hamsonbarronsmith.com

CONTENTS

1.0 EXECUTIVE SUMMARY 3

2.0 INTRODUCTION 4

2.1 BUILDING REGULATION REQUIREMENTS - SCHOOLS 4

2.1.1 ASSESSMENT METHODOLOGY 5

2.1.3 WEATHER DATA 5

3.0 ENERGY COMPLIANCE 6

4.0 ANNEX – BRUKL DOCUMENT 9

Oakdale Primary School, Expansion Project Sustainability Statement

3 Hamson Barron Smith Tel: 01444 449400 www.hamsonbarronsmith.com

1.0 Executive summary

Hamson Barron Smith (HBS) have undertaken Building Regulations Part L2A compliance simulation of the proposed KS2 (Block N) teaching block extension at Oakdale Primary School.

The proposed extension is greater than 100m2 and exceeds 25% of the existing building’s floor area; hence, it triggers compliance requirement with Approved Document Part L2A.

Based on the current design proposals there is no requirement for a renewable energy system in order to comply with Building Regulations or any other planning criteria.

The appointed Contractor will carry out the technical design (RIBA Stage 4 onwards). The Contractor shall have the responsibility to produce a final design stage thermal model to achieve compliance with Building Regulations.

The attached BRUKL in the annex illustrates the energy performance of the proposed building is sufficient to meet the requirements of Building Regulations Part L2A (2013).

Oakdale Primary School, Expansion Project Sustainability Statement

4 Hamson Barron Smith Tel: 01444 449400 www.hamsonbarronsmith.com

2.0 Introduction

2.1 Building Regulation Requirements - Schools

This report demonstrates the thermal and energy performance of Block N at Oakdale Primary School. An

analytical study has been undertaken to establish whether the proposed MEP strategy satisfied the

requirements of Approved Document Part L2A of the Building Regulations.

Below are images of the thermal model.

Oakdale Primary analysis model– View from East

Oakdale Primary School, Expansion Project Sustainability Statement

5 Hamson Barron Smith Tel: 01444 449400 www.hamsonbarronsmith.com

Oakdale Primary analysis model– View from Northwest

2.1.1 Assessment Methodology

The analysis was carried out using IES Virtual Environment software, version 2017.

2.1.3 Weather data

CIBSE Norwich TRY2005 weather data has been used in these calculations as the nearest representative

weather file.

Oakdale Primary School, Expansion Project Sustainability Statement

6 Hamson Barron Smith Tel: 01444 449400 www.hamsonbarronsmith.com

3.0 Energy compliance

Building regulation requirements

Approved Document L2A (ADL2A) provides recommended means of compliance with the Building

Regulations requirement for conservation of fuel and power in new buildings. It states that in the

Secretary of State’s view, compliance with the energy efficiency requirements would be demonstrated by

meeting the five separate criteria set out in the Approved Document L2A.

 Criterion 1 – Achieving an acceptable building CO2 emission rate

 Criterion 2 – Limits on design flexibility

 Criterion 3 – Limiting the effects of solar gain in the summer

 Criterion 4 – Quality of construction and commissioning

 Criterion 5 – Operating and maintenance instructions

ADL2A Compliance

The requirements of ADL2A apply to all areas of the new building.

Criterion 1 – Achieving an acceptable building CO2 emission rate

Building Emissions Rate (BER) has been calculated using IES Thermal Environment 2015, an approved

software tool.

Criterion 2 – Limits on design flexibility

Building Fabric

The as-designed construction U-values are as shown below:

Roof 0.18 W/m2.K

Wall 0.26 W/m2.K

Floor 0.22 W/m2.K

Window 1.6 W/m2.K

Oakdale Primary School, Expansion Project Sustainability Statement

7 Hamson Barron Smith Tel: 01444 449400 www.hamsonbarronsmith.com

Rooflight W/m2.K

Average window and rooflight glazing g-value shall be 40% and 55% respectively.

Air Permeability

An air-tight building envelope also contributes to minimising heat losses. The proposed air permeability

for side-lit spaces is 5 m3/h/m2 at 50 Pa. The proposed air permeability for top-lit spaces is 5 m3/h/m2 at

50 Pa. The limiting air permeability for all spaces in Part L is 10 m3/h/m2 at 50 Pa.

Heating

The proposed heating systems shall comprise new gas fired condensing boilers supplying low temperature

heat to each demise of the building via radiators. The proposed seasonal efficiency of gas boilers is 96%.

The radiators shall incorporate thermostatic valves to control the heating according to the desired room

temperature. Hence, heating to individual radiators shall be shut-off when room temperature is achieved

to save energy.

Hot Water

Domestic Hot Water is via electrically powered insulated point-of-use vessels. Hot water shall be provided

to the cleaner store and pupil WCs.

Lighting

The lighting proposed will be either T5 HF fluorescents or LED fittings, both of which have extremely high

efficacy of 84 Lumen/cW (minimum) and will come complete with PIR absence detection and daylight

dimming in all suitable areas. Building regulations 2013 requires over 60 Lumens/cW and also assumes

similar controls will be used.

Absence detection ensures that the lights will go out if there is nobody in the room, but will only come on

again when someone turns them on at the switch. Daylight dimming ensures the light fitting monitors

ambient light levels and dims or turns off when there is sufficient daylight in the space directly under the

particular fitting. This will enable lights adjacent to the windows or near a sky light to turn off. These

controls should reduce energy use from lighting by 35% in classrooms and up to 60% in WCs.

Ventilation

The proposed teaching classrooms shall be served by motorised weather louvres supplemented with

motorised openable windows. Mechanical supply and extract ventilation with heat recovery shall be

provided to the Pupil WCs. The extract ventilation system shall comprise a zonal extract fans with a

maximum specific fan power (SFP) of 0.5 Watts/lit/sec which is in line with the recommendation of Non-

domestic Building Services Compliance Guide.

Oakdale Primary School, Expansion Project Sustainability Statement

8 Hamson Barron Smith Tel: 01444 449400 www.hamsonbarronsmith.com

Renewables

No renewable systems shall be provided.

Criterion 3 – Limiting the effects of solar gain in the summer

For school buildings, the ADL2A refers to Building Bulletin 101 for guidance on methods to show compliance

with the requirement to control excessive solar gains. The ability to achieve thermal comfort shall be

demonstrated successfully by thermal modelling

Criterion 4 – Quality of construction and commissioning

Upon completion of each phase, the architect and main contractor shall provide evidence that the new buildings have been constructed and equipped such that the performance is in line with the predicted Building Emission Rating. A separate report shall be submitted providing evidence of compliance with this criteria, including results of the air permeability and pressure test.

The building services shall be commissioned in accordance with the requirements set out in the ADL2A. Refer to the Scope of Works document section on commissioning requirements for the main contractor. These shall be monitored by the building services consultants and all commissioning results included within the Operation and Maintenance manuals.

Criterion 5 – Operating and maintenance instructions

The building users shall be provided with information on the building, its fixed building services and their maintenance requirements as required by the ADL2A. These details shall be provided prior to hand-over. Refer to the Scope of Works document section on the Operation and Maintenance documentation to be provided by the main contractor.

Oakdale Primary School, Expansion Project Sustainability Statement

9 Hamson Barron Smith Tel: 01444 449400 www.hamsonbarronsmith.com

4.0 Annex – BRUKL Document

The BRUKL 2013 compliance document is attached at the end of this document.

BRUKL Output Document Compliance with England Building Regulations Part L 2013

Administrative information

Criterion 1: