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
Standard Assessment Procedure (SAP) is the UK government’s recommended method system for measuring the energy rating of residential dwellings. The SAP rating is a scale from 1 to 100+, with dwellings that have a SAP over 100 being net exporters of regulated energy
TER
The target CO2 emission rate (TER) sets a minimum allowable standard for the energy performance of a building. TER is expressed in kg CO2/m2/yr
DER
The Dwelling emission rate (DER) is the actual CO2 emission rate of self-contained dwellings based on their actual specification. DER is expressed in kg CO2/m2/yr. The DER for the proposed building must not exceed the TER
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
ACDS
Accredited construction details (ACDs) are a set of standardized junction details that can be followed to ‘design out’ thermal bridges in compliance with the energy efficiency requirements (Part L) of the Building Regulations
PIR BOARD
PIR (polyisocyanurate) Board are the most popular type of rigid insulation boards currently available. PIR boards are usually laminated with aluminium foil facings. Celotex, Kingspan, and Xtratherm are the most common brands
DFEE
Dwelling Fabric Energy Efficiency (DFEE) is a measure of energy demand measured in kWh/m2/yr. The DFEE for the proposed building must not exceed the TFEE
TFEE
Target Fabric Energy Efficiency (TFEE) is the target energy demand, measured in kWh/m2/yr, that a dwelling must achieve
U-VALUES
U-values (W/m2K) are used to measure how effective elements of a buildings fabric are as insulators. The lower the U-value, the better the floors, walls and roofs are as heat insulators
PSI VALUES
The heat loss associated with the non-repeated thermal bridge is called linear thermal transmittance or psi-value or ψ-value (pronounced ‘si’). This is the rate of heat flow per degree per unit length of the thermal bridge that is not accounted for in the U-value of the plain elements
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
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
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 DOCUMENT
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