When carrying out any significant roof level refurbishment, it presents an excellent opportunity to improve the thermal performance of a building, by either increasing the level of insulation, or improving the insulation in place.
The UK government has set specific regulations regarding the insulation of roofs during refurbishment projects to increase energy efficiency and reduce carbon emissions.
Current building regulations state that, all roofs to rooms (except those in unheated buildings) should be thermally insulated to a maximum U-value of 0.18 W/m²K.
However, there are instances where achieving the necessary U-values may not be possible. It’s important to learn how to navigate exemptions for non-insulated roof refurbishments – We run through some reasons below, however it is important to note that as no two roofing projects are the same and the below should not be taken a guidance, it is always advisable to approach your location building control representative for bespoke advice.
Roof Space Limitations
If there is not enough space in the roof to add insulation, it may not be necessary to do so. This could be because of structural or existing design limitations, or because there is not enough room to install insulation without compromising the safety or stability of the building.
Existing Insulation
If the roof is already adequately insulated, it may not be necessary to add any more.
Temporary Structures
If the building is only going to be used for a short period of time, it may not be necessary to insulate the roof. This could include temporary structures such as construction site offices or events marquees.
Protected Buildings
Some buildings are protected by law, and any work that is carried out must maintain their original character and appearance. In these cases, installing insulation may not be appropriate, as it could affect the building’s historic or aesthetic qualities.
Technical Feasibility
There may be instances where it is technically difficult or impossible to insulate the roof. This could be due to the size, shape, or orientation of the roof, or because of the type of roofing material that is being used.
Financial Considerations
The cost of insulating a roof can be a significant expense, and in some cases, it may not be feasible for the building owner to fund the work. In these instances, it may be possible to apply for a grant or other form of financial support to help cover the costs or apply for an exemption.
In the instances it is not feasible to upgrade the insulation on a roof understanding the exemptions for non-insulated roof refurbishments is critical for contractors and building owners. By considering the factors outlined above, it is possible to determine whether insulating the roof is necessary, and if so, what type of insulation is most appropriate.
