Technical Support 
1. SAP Calculations 
 
At Varley Insulation Products we provide SAP calculations, alterations and consultancy. 
 
SAP calculations are required to prove Building regulations Part L compliance for all new build properties, all conversions and all extensions where the glazed area is over 25% of the floor area. 
 
As part of our service we advise our clients as to how they can best achieve compliance in the most cost effective manner, for this reason all of our SAP calculations are site specific. Alterations are free of charge and, if required, we will also liaise with Building Control Officers on your behalf.  
We have built a large portfolio of satisfied clients, these range from national home builders to private individuals and whatever the project our standards remain the same.  
 
If you would like to know about some of the projects that we have worked on, are currently working on, then please feel free to contact us and we will be happy to share our experiences. Our desire to build lasting working relationships ensures that the service that we offer is second to none. 
 
Please click on the links below to download the documents: 
2. U-values 
 
The U-value measures how well a building component, e.g. a wall, roof or a window, keeps heat inside a building.  
 
For those living in a warm climate the U-value is also relevant as it is an indicator of how long the inside of the building can be kept cold. 
 
Comfortable indoor climate with good U-values 
 
In both cold and warm climates good U-values are important measures for understanding the amount of energy that is needed to keep a comfortable inside temperature. 
 
What is the U-value? 
 
The U-value is a measure of the heat flow through a building element. The higher the U-value the more heat flows through so a good U-value is a low one as you want to keep heat inside the building or outside depending on the climate you live in.  
 
The technical explanation of the U-value 
 
Getting a little technical the U-value physically describes how much thermal energy in Watts [W] is transported through a building component with the size of 1 square meter [m²] at a temperature difference of 1 Kelvin [K] (=1ºC). Thus the unit for U-values is W/(m²K). 
Using building components with low U-values (i.e. good) has a number of advantages: 
 
It saves money 
It helps preserve the environment 
It is good for your health 
It gives better indoor comfort 
A house built with low U-value building components will use less energy and thus the building owner saves money on the energy bill. Using less energy is good for the environment. 
Good U-value building components increase the surface temperature on the inside which is critical in preventing growth of mould and fungus as well as draught of air. Good U-values also improve the indoor thermal climate and create healthy buildings for the residents. 
 
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3. Energy Performance Certificate (EPC) 
You must provide an Energy Performance Certificate (EPC) for any new property you build, whether it is marketed or not. The EPC gives information on a building's energy efficiency in a sliding scale from 'A' (very efficient) to 'G' (least efficient). 
For developers selling houses off-plan (not yet built), a Predicted Energy Assessment (PEA) is usually required. 
 
If the new home is being marketed for sale, the EPC or PEA must be provided to prospective buyers. 
In new homes, the EPC must be produced by a domestic energy assessor accredited on construction. This assessor does not need to visit your property, but must use an approved version of the Standard Assessment Procedure (SAP) software.  
 
The EPC will be the result of the 'As Built' check, which is an extension of the SAP rating calculated at the design stage. The EPC comes with a recommendation report that includes advice on improvements you could make to save money and energy. 
 
Please click on the link below to download the document: 
 
4. Code for Sustainable Homes 
 
Please click on the link below to download the document: 
 
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