PSI-Value Calculations
Request a Free Quote Today
Our vastly experienced and knowledgeable Energy Consultants can provide PSI-Value Calculations for thermal junctions for residential and commercial projects.
Request a Quote From
EPS Group Today
- Calculated PSI-Values can be used to help SAP or SBEM Calculations comply with Building Regulations.
- Reduce build costs by removing the need for more costly compliance options.
- Quick Turnarounds.
PSI-Value Calculations for Thermal Junctions
Psi-Values are used to calculate a building’s overall heat loss at a junction (also referred to as non-repeating thermal bridges).
PSI-Value Calculations are different to U-Value Calculations in that a U-Value Calculation determines heat loss through thermal elements such as floors, walls, roofs etc. Thermal bridges on the other hand are the area between these elements, which can have a much greater heat loss than the surrounding elements.
Examples of thermal junction or thermal bridges within buildings are :
- Window Lintels, jambs and sills
- Door jambs
- Roof to wall junction
- Wall to floor junction
- Corners
At EPS Group, we have extensive experience in PSI-Value Calculations and are able to provide you with a service that is suitable for your needs, whether it be to help reduce build costs, help create a highly efficient building or demonstrate compliance with SAP or SBEM Calculations.
For more information relating to PSI-Value Calculations please explore the Frequently Asked Questions below.
Why Choose Us
Competitive Pricing
EPS Group regularly review our pricing to ensure that we offer the most competitive rates on the market. If you do find a cheaper quotation, we’ll do our best to match it.
Fully Accredited
With EPS Group you can be confident that you are working with a fully accredited energy consultancy.
In House Team
At EPS Group we believe in building ongoing relationships with clients. Customer care is our primary focus and for these reasons we do not use sub-contractors.
UK Coverage
Our in-house team covers the entire UK, no matter which service you require or where you are based, we’ve got you covered.
48 Hour Turnaround
We understand that time is critical. That’s why we offer an optional 48 Hour Turnaround Service for Energy Consultancy Services.
Proudly Working With
Members of the Elmhurst Energy Consultancy Scheme
With EPS Group you can be confident that you are working with a fully qualified consultancy for PSI-value calculations.
Let’s discuss your project
What is PSI-Value Calculation?
Psi-Value Calculations are a desk-based exercise using specialist thermal modelling software to calculate a building’s overall heat loss at a junction or thermal bridge.
There are two types of thermal bridges in buildings; repeating and non-repeating. Repeating thermal bridges such as timber studs bridging insulation are taken into account in u-value calculations.
Non-repeating thermal bridges occur at junctions between building elements or thermal junctions. These areas can have significantly higher heat transfer than the surrounding materials and they occur where two thermal elements meet and are calculated using PSI-Values.
PSI-Value Calculations Explained
Whilst new buildings are now highly efficient in terms of insulation levels, air tightness and HVAC systems, care still needs to be taken to ensure that the thermal junctions or bridges between these elements are not diminishing the performance of a building.
Calculated PSI-Values can be input into SAP or SBEM Calculations rather than using generic ‘default’ values. This greatly increases the chances of demonstrating compliance with Approved Document L of the Building Regulations.
Although calculated PSI -Values may be more costly than using generic or default values, they can provide significant savings in build costs and therefore prove to be a highly effective option.
PSI Value Calculation FAQs
Why would I need PSI-Value Calculations?
PSI-Value Calculations are used in SAP or SBEM Calculations and can help to demonstrate compliance with Approved Document L of the Building Regulations. They can also create energy savings by predicting heat loss lost through thermal junctions.
What are the main types of Thermal Bridges?
Repeating thermal bridges
Repeating thermal bridges are allowed for in U-Value Calculations and are not part of the PSI-Value Calculation, for example cavity wall ties or timber studs between insulation in a timber frame wall.
Non-repeating thermal bridges
Non-repeating thermal bridges occur at junctions between building elements, such as corners, lintels, jambs etc. A PSI-Value is used to predict the heat loss between these elements.
Can I still use Accredited Construction Details?
In Approved Document L 2021 the use of Accredited Construction Details was withdrawn. Whilst they can still be used in older projects, they are now seen as out of date and not fit for purpose.
Standard sets of construction details do still exist, but they are not as precise as calculated PSI-Values.
What is a Y-Value?
The Y-value is a prediction of the heat losses across all non-repeating thermal junctions in a building. This is calculated by multiplying the length of each junction by the PSI-Value and then dividing this by the total area of external elements (excluding party walls).
How can EPS Group help with
PSI-Value Calculations?
Regardless of whether PSI-Value Calculations are required for a residential, commercial or mixed-use development, we can help achieve compliance with Approved Document L of the Building Regulations.
There are many reasons to appoint us to provide your PSI-Value Calculations including:
-
Fully Qualified & Knowledgeable Team
Our Consultants are fully qualified and insured to assess projects of all sizes and uses throughout the UK. You can therefore rely on the advice and services that they provide. -
Pragmatic Approach
We understand that the Building Regulations can be tedious at times but also understand that they are there for a good reason. We work with clients to explore ways of achieving compliance with minimal fuss and cost. -
Competitive Pricing
We provide transparent, competitive, all-inclusive fixed fees with significant discounts available for developments with multiple units.
-
Expedited Service
We understand that Overheating Risk Analysis can be overlooked when planning a project. We can therefore often provide an expedited service if a deadline is pending. -
Multi-disciplined Team
Our Multi-disciplined Team provides a range of supplementary new build assessment and compliance services including SAP Calculations, SBEM Calculations & BRUKL Reports and Air Tightness Testing. -
Ongoing Technical Support
We understand that building designs are often subjected to change. We are therefore available to update or amend any previously issued Overheating Risk Analysis at a reasonable cost with minimum fuss.
How it Works
Send us your specifications
We’ll provide a competitive price
You give us the go ahead
Our in house team will complete the PSI Value Calculations
How it Works
Send us your specifications
We’ll provide a competitive price
You give us the go ahead
Our in house team will complete the PSI Value Calculations
