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Jostec Contact Details

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Adam Joselyn
177 Balmoral Drive

About Jostec

Welcome to JosTec, formerly RJ Acoustics
Don’t worry, we’re still the same people, offering the same great service, we’ve just undergone a re-brand.

When we started as a business we only offered air tightness and acoustic services. Ten years on, the name RJ Acoustics is restrictive and doesn’t accurately represent everything we’re able to offer.

Re-branding as JosTec allows us to continue to add services to our offering that we believe fit in with what we’re already doing, so that we can offer everything our customers need under one friendly, familiar house.

Our Services
  • Sound Insulation Testing
  • Air Tightness Testing
  • Ventilation Testing And Commissioning
  • SAP Calculations & EPCS
  • SBEM Calculations
  • Water Efficiency Calculations
  • Energy Statements
  • Energy Saving & Reducing Carbon Emissions

Sound Insulation Testing
Sound insulation testing or pre-completion testing must be carried out on new build properties as well as converted properties. A property will either require an Airborne test or an Airborne and Impact test. Airborne tests are carried out on separating walls between habitable rooms of flats and houses. Airborne and Impact tests are carried out on the separating floors between habitable rooms of flats. Sound insulation testing must comply with Building Regulations Approved Document E.

All of our sound insulation tests are carried out in accordance with ISO 140-4 and ISO 140-7. All of our test engineers are members of the Institute of Acoustics. New build properties need to meet the requirements of DnTw+Ctr ≥45dB and LnTw ≤62dB. Conversion properties need to meet the requirements of DnTw+Ctr ≥43dB and LnTw ≤64dB.

Air Tightness Testing

Air tightness testing, also known as an air leakage, air infiltration or air permeability testing is a test to indicate the cubic metres of air leakage per hour per square metre of external area of the building – (m3/hr.m2) – as per Part L of Building Regulations.

Air leakage can occur through gaps and cracks in the fabric of the building envelope, allowing heat to escape, thus driving up heating bills and C02 production. Part L of the Building Regulations now requires that a representative sample of all new-build domestic dwellings be tested for air leakage.

For more information,Contact Us


Products & Services

Ventilation commissioning

Vent test

Part E Test

Sound test

Air test


SAP calculations

water efficiency calculations

Ventilation test

sound insulation test

air tightness test


Name Role Email Telephone
Adam Joselyn Director / Air Tightness Engineer 01923 518 923
Robert Joselyn Director / Sound Insulation Engineer 01923 518 923
Joe Smith Air Tightness Engineer 01923 518 923
Szabolcs Jako Air Tightness Engineer 01923 518 923

Jostec General Description

We specialise in sound insulation testing and air tightness testing. We provide free consultations and can organise SAP/EPC and noise surveys
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2024/05/18 07:51:08