Insulation compliance requirements

new_build_homeownerfree compliance report

Building your own home is one of the most significant, important and life changing events you will do in your lifetime and will have a positive effect on you and your family for many years to come. Making the correct decisions to meet your requirements is all important in terms of site, type and size of building and various finishes.

Central to all of this is the energy efficiency and cost effective running of your home which will have a long-term effect on your comfort, quality of life and financial wellbeing.

Recent changes to building regulations means that each new build home must comply to Part L of the building regulations 2011, which will make it mandatory for all new homes to be 60% more energy efficient than the standards at the peak of the construction boom in 2005. Each new home must demonstrate at commencement notice stage how this will be achieved and also demonstrate at completion stage how it was achieved in addition to producing a Building Energy Ratings certificate (BER)

As you can imagine achieving these targets is confusing and very stressful for you the homeowner. We at GMS Insulations Ltd in conjunction with our partners have over 30 years experience in the construction industry not only in insulation but in all areas of the construction process and we remove the stress and uncertainty from your self-build project by providing expert advice and regulatory compliance for your project.

Through our partners 2eva ( we provide a complete Part (L) calculation including the relevant U-Value calculations to prove compliance with the current building regulations. We provide this information to you in the form of a detailed report which has a summary sheet at the front which helps to demystify the one off client and the technical details for their builder or suppliers about performance thresholds.

This pre compliance report contains all the necessary information on fabric insulation, air tightness, window and door performance, heating systems, and renewable energy requirements and content and crucially is a requirement when submitting your commencement notice to the local building control prior to starting you build.

This report also acts a template for performance specification when constructing your home and will specify the performance criteria for every element of your build.

This building regulation compliance report is free to clients who use Icynene Spray Foam Insulation products in their walls or roof or both.

In addition our partners 2eva can work with you throughout the build and at the completion by providing airtightness testing and final Building Energy Rating (BER) Certification. Alternatively we will provide the clients BER Assessor with the .xml file (the software file with all of the information) that was prepared for pre compliance at commencement notice stage

By providing this service we remove the stress and uncertainty from you new build and make it what it should be, an enjoyable exciting experience

Our philosophy at GMS is to concentrate on reducing the primary energy demand of your home, by

A)   Providing a well insulated building envelope (Walls, Roof & Floors) utilising The Icynene Thermaseal Passive Wall & Passive Roof System.

B)   Specifying high levels of air tightness with Mechanical Heat Recovery Ventilation for maximising indoor air quality and comfort.

C)   Specifying high performance windows and doors.

D)   Specifying a high performance heating system for space and hot water heating requirements which also meet the renewable energy content of the regulations (Solar Thermal, Photovoltaic, Biomass, Air/Ground source heat pump etc)

Why wait, contact us today with your drawings to start the process of Future Proofing your home for a guaranteed lifetime of savings and comfort      

Building Regulations – Part L compliance – A summary

Building an Energy Efficient home is not just about saving money and protecting the environment - it’s the law!

By law you need a Building Energy Rating (BER) Certificate.
By law your new home must conform to Building Regulations that require you to demonstrate a 60% reduction in Energy Consumption from previous standards


In order to demonstrate compliance with the 2011 Revisions to Building Regulations the following criteria must be met:

Achieve the Energy Performance Coefficient (EPC) of less than 0.4, using the DEAP Assessment Procedure for the energy rating of dwellings.
Minimum Acceptable U-value Standards.
Prevention of Cold Bridging & the limitation of Air Leakage.
Demonstrate an Air-tightness by testing of less than 7m3/h.m2 @ 50Pa
Provide 10 kWh/m2/annum contribution from Renewable Energy Technologies contributing to energy use for domestic hot water heating, space heating or cooling; or 4 kWh/m2/annum of electrical energy

The importance of controlling air leakage or air infiltration


Air leakage is defined as the flow of air through gaps and cracks in the building fabric. Uncontrolled air leakage increases the amount of heat loss as warm air is displaced through the envelope by colder air from outside. Air leakage of warm damp air through the building structure can also lead to condensation within the fabric (interstitial condensation), which reduces insulation performance and causes fabric deterioration.

Air leakage is a ‘double whammy’ in energy efficiency terms, because warmed air leaks out and cold air leaking in then needs to be heated

The airtightness of a dwelling, or its air permeability, is expressed in terms of air leakage in cubic metes per hour per square metre of the dwelling envelope area when the building is subjected to a differential pressure of 50 Pascals (m3/(h.m2)@50Pa).

The dwelling envelope area is defined in this context as the total area of all floors, walls and ceilings bordering the dwelling, including elements adjoining other heated or unheated spaces.

Air permeability figure are used in DEAP calculations and poor airtightness can significantly affect the calculated thermal performance of a building.

A reduction in air permeability (@ 50Pa) from 15 (m3/(h.m2 ) to 5 (m3/(h.m2)

= Energy savings of approximately 35 -50%

The air permeability of a building can be determined by means of a pressure test conducted using a device referred to as a Blower door. Building Regulations 2011 TGD-L (Dwellings) indicates that reasonable provision for airtightness is to achieve a pressure test result of no worse than 7m3/(h.m2)@50Pa. , however best practice is regarded as less than 3m3/(h.m2)@50Pa , with Passive House requirements being less that 1m3/(h.m2)@50Pa . Icynene’s range of products regularly delivers airtightness levels of   1.5m3/(h.m2)@50Pa.

When achieving high levels of air tightness it is mandatory that a proper mechanical Heat Recovery Ventilation System and this can deliver up to 30% savings on space heating in addition to providing fresh filtered air changes for excellent indoor air quality and health