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Glossary

Air

DAP

Design Air Permeability – The score you need to achieve to pass your air tightness test

m3/hr.m2

How an air tightness score is expressed. Metres cubed of air leakage per hour, per square metre of building envelope

ATTMA

The Air Tightness Testing and Measurement Association. The governing body for all air tightness testing

ATTMA TSL1

ATTMA Testing Standard L1 – the standard that we test to for domestic/residential dwellings

ATTMA TSL2

ATTMA Testing Standard L2 – the standard that we test to for commercial dwellings

Pressurise

A method of creating pressure inside a building by blowing air into it, using an industrial sized fan

Depressurise

A method of creating a negative pressure inside a building by sucking air out of it, using an industrial sized fan

Building Envelope

This is the combined internal area of the floor, walls and ceiling of a dwelling or building

Air Permeability, Air Tightness, Air Infiltration

These all mean the same thing – they are all terms for what we are testing for – the amount of air (and therefore heating) escaping from a building

SAP/EPC

TER

Target Emissions Rate – the target CO2 emissions figure which must be achieved by the proposed dwelling

DER

Design Emissions Rate – the actual CO2 emissions figure which has been achieved by the built dwelling

Energy Performance of Buildings Directive (EPBD)

The European Union’s main legislative instrument aiming to promote the improvement of the energy performance of buildings within the Community

Predicted Energy Assessment (PEA)

These are for new build homes. Normally, when a home is designed, a “target energy rating” based on the design is produced to show a building inspector that the property will meet requirements under Part L of the Building Regulations

On Construction Energy Performance Certificate (OCEPC)

This is an Energy Performance Certificate, which gives information on the buildings energy efficiency, and is displayed similar to the A-G ratings found on electrical appliances

Sound

Airborne

The name for sound that travels through the air, i.e. talking, TV, radio etc.

Impact

the name for sound the travels through a partition when an object is in contact with that partition, i.e. walking, washing machines, hammering etc.

UKAS

The United Kingdom Accreditation Service – a governing body for sound insulation testing, amongst other things. RJ Acoustics are accredited by UKAS for Building Regulation Approved Document E sound testing

Decibel

A unit for measuring sound

Loudspeaker

The speaker we use to create airborne noise

Decibel Meter

The machine we use to record the amount of noise (in decibels) coming through the wall or floor

Tapping Machine

The machine we use to create impact noise on the floor. A box with metal hammers that continually tap on the floor

Pre-Completion Testing

testing that is completed towards the end of a build, just before it is completed

White Noise

The type of noise created by our loudspeaker – it’s defined as noise containing many frequencies with equal intensities

Flanking

Noise that bypasses the partition being tested. Eg, when testing walls, the noise would travel through the floor/ceiling void. When testing the floor/ceiling, the noise would travel through the walls

Ventilation

Flow Rate

The rate of air flowing through an extract fan or heat recovery vent

l/s

Litres per second. This is the rate that we measure flow at

BPEC

British Plumbing Employees Council. Ventilation testing should be carried out by a BPEC qualified professional using UKAS calibrated equipment

Anemometer

a wind/flow speed meter. Used to measure the flow rate from and extract fan or heat recovery vent

Mechanical Extract Ventilation (MEV)

This can either be a whole house system or a localise system for specific rooms. Multiple ducts will run from a constantly running unit to wet rooms (kitchen, WC, bathroom) continuously extracting stale air. When these rooms are in use, the system will boost up to extract a larger volume of air

Mechanical Ventilation Heat Recovery (MVHR)

This is similar to Mechanical Extract Ventilation, except that it also supplies fresh air to all non-wet rooms (bedrooms, dining room, living room). The heat from the stale extracted air is kept in the central unit and used to heat the fresh air from outside before it is supplied to the house

Extract Fan

The fans found in most bathrooms and kitchen cooker hoods. Simply draws air out of a room to outside

Water Efficiency

Potable Water

Water that is suitable for drinking

General

Dwelling

A house, flat or other place of residence

Approved Document

A document that gives guidance for compliance with the Building Regulations for building work

Building Regulations

These are statutory instruments that seek to ensure that the policies set out in the relevant legislation are carried out. Building regulations approval is required for most building work in the UK

Building Control

The body that ensures that the building regulations are adhered to. They will have final sign off on your development