PSI Value Calculations

Identify areas where insulation may be compromised

Boosting your building’s energy ratings and ensuring
Part L compliance

PSI value calculations – also known as thermal bridging calculations – are used to evaluate heat loss at junctions where building elements meet, such as wall-to-floor or roof-to-wall connections.

Accurate PSI values are essential for improving energy efficiency, meeting UK Building Regulations, and achieving higher SAP or SBEM scores for your property. But they can be costly, particularly for small projects or repeated designs, which makes it hard for you to balance compliance requirements with budgetary needs.

With this in mind, it’s vital to partner with a professional firm that can deliver the data you need, at a price you can afford – and this is where Energy Digest can help.

Why do you need this service?

Enhance energy
efficiency

Reducing thermal bridging reduces the amount of wasted energy and keeps operational costs to a minimum. 

Prevent condensation
risks

These calculations help to mitigate moisture accumulation at cold spots, protecting the building’s structural integrity and occupant health.

Helps achieve
Part L Compliance

Lower PSI values lead to improved SAP Scores, which improves your chances of passing compliance, which is imperative for your project.

Our Process

Collect construction
build-up details,

including submitting junction specifications and material data.

Perform PSI value calculations

using advanced thermal modelling tools.

Review and optimise the results

to ensure the calculations meet performance and compliance standards.

Update SAP calculations

by integrating PSI values into the SAP report.

Issue reports,

including a comprehensive breakdown of results with recommendations.

Why choose Energy Digest?

To reduce duplication and save on resources, our energy consultants can deliver standardised solutions that are applicable across multiple projects.
We’ll evaluate critical thermal bridges in great depth using the advanced 2D and 3D modelling tools that are at our disposal – and we’ll provide you with fully Part L compliant calculations to support a hassle-free approval.

Remember, we offer free psi-value certifcates if we already have matching junction details for your project. This cuts costs and speeds up the process while maintaining accuracy and ensuring your SAP compliance goals can be met.

Fast turnaround time

To help you meet your own deadlines, we’ll issue your thermal bridging calculations within 5 days.

Multi-disciplined team

We cover 20+ services in the built environment, with specialists providing high-value calculations and strong advice.

Practical solutions

Our professionals provide recommendations that are calculated to ensure real world outcomes, resulting in cost-effectiveness and high impact.

Unrivalled support

Our service doesn’t end with the reports. We can provide ongoing support and expertise, from planning to completion.

Speak to our
experts today

FREQUENTLY ASKED QUESTIONS

PSI Value Calculations
FAQs

PSI values account for heat loss through thermal bridging, directly impacting SAP calculations. Lower PSI values improve energy efficiency scores, helping achieve Part L compliance and better building ratings.

Pre-calculated PSI values for standard junctions eliminate repetitive calculations, reducing costs and expediting compliance while maintaining precision.

Common thermal bridges include wall-to-floor connections, wall-to-roof junctions, window and door reveals, balcony penetrations, and external wall corners. These areas require careful assessment to reduce heat loss.

Materials with low thermal conductivity improve PSI values by reducing heat transfer. High-performance insulation and efficient construction techniques result in lower PSI values, boosting energy performance.

We use THERM and AutoPSI, advanced thermal modelling tools that simulate heat transfer at junctions to deliver precise and compliant results for SAP and Part L compliance.

What are the key components
of our PSI value calculations?

To help us reach accurate figures and deliver a high-value service, we’ll conduct the following:
 
• A thermal bridging assessment, which we use to evaluate critical junctions and identify areas where insulation may be compromised.
• Advanced thermal modelling, which utilises cutting-edge tools like THERM and AutoPSI to precisely calculate heat transfer at junctions.
• Material and design optimisation techniques to ensure the most effective materials and construction strategies are chosen to minimise heat loss.

Spoke with Josh who not only reassured me but asked for a fee that I thought was fair. Thank you Josh. Use again? Definitely.

Steve Quirk

The team really know their stuff – super helpful and always had clear answers to any questions or compliance issues we ran into. Definitely our go-to for any future projects!

Nathan Donnelly

Quick and well priced water calculation service and received an appliance specification report alongside the certificate which was really useful for us and the building control officer, highly recommended!

Ilma Akhtar

Very knowledgeable about building regulations, and the industry. Always goes the extra mile to help out! 5*

Karim Meraga

Still unsure?

We offer free phone call and email support until you’re ready to proceed with us.
Access free support for your project now.

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