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Maintaining Render to Meet Property Regulations - Render Maintenance

A key role for any property manager is to ensure the building has the correct rendering regulations in place.

This can mean at times, re-rendering works need to be carried out, while an annual render maintenance service will ensure the rendered building regulations are met.

Listed buildings and properties in conservation areas or national parks may require special consent for any rendering works undertaken on the building’s exterior.

In our latest blog, we’ll consider some of the key factors for property managers when it comes to re-rendering and render maintenance. 

What are the building regulations for render?

The building regulations, as defined in Regulation 2a of the Building Regulations 2000, state external walls are considered as thermal elements.

When 25 per cent or more of an external wall is re-rendered then the render building regulations state the thermal insulation would have to be improved too.

This is measured by calculating the surface area of the whole exterior building, e.g. all external walls, roof, floors, windows, doors, roof windows and roof lights. 

Depending upon the distance of the wall to the boundary of an adjacent property, that wall may need to provide fire resistance properties to prevent the spread of fire. 

If the exterior walls where the rendering is taking place are load-bearing, either by supporting a roof or storey above, then fire resistance is also required. 

Thermal Insulation

Undertaking significant re-rendering work will require insulation work to improve the overall thermal performance of the exterior wall.

Within the Building Regulations Part L1B, there is a requirement for property owners to ensure the walls have U-values no greater than 0.3 W/m2K. The U-value measures the flow of heat through a thermal element whereby the lower the value, the more insulated it is. 

The render needs to be compatible with the backing material, as this can lead to the material becoming saturated with water, allowing moisture to enter the cavity behind.

When it comes to the work itself, we would recommend checking the product being used is suitable for the property, location, and environment, as so to ensure the work doesn’t fall foul of any render building regulations. 

Certainly, we would advise a specialist contractor who fully understands the building and the rendering project you wish to achieve is employed to carry out the works. 

How to maintain render according to building regulations

A building’s rendering can be affected by algae, carbon pollution, rust, and paint, which can damage the render and building’s reputation in one fell swoop.

Leaving the stains to build-up over time can impact the building’s rendering regulations. For example, leaving algae, carbon, or paint stains to linger on the building will create an ugly eyesore in the community. 

At Spectrum, we recommend an annual rendering cleaning service from a professional company. Professionals will understand the best cleaning operation to undertake to remove any rendering stains and protect the rendering too. When left untreated, organic stains like algae, and pollution stains, can spread and become more difficult to remove. 

It’s important for property managers to undertake regular checks of their building's exterior to ensure the rendering regulations are met, as UK Councils are empowered to take legal action if property owners fail to properly maintain the exterior of the building. 

This can include when the rendering falls into a state of disrepair or the stains become an ugly eyesore within the community. Legal action can include fining the property owners, as well as having to cover the cost of rendering cleaning works too.   

Void manufacturer warranties

During the rendering process, the work carried out to the building’s exterior will be covered by a warranty. If the rendering work wasn’t completed to the required standard or the rendering started to fail, the manufacturer is obliged to correct the work.

A standard warranty will likely have terms and conditions which invalidate this clause. A typical clause will make it a requirement for the priority owner to apply a thorough cleaning and maintenance service to the render. Should this be neglected, then the warranty is almost certainly void, leaving the property owner to foot the bill while falling foul of render building regulations. 

Void building insurance

The same outcome for an invalid warranty will also apply to building insurance. Should any damage occur to the building’s exterior, the insurance company will want to see evidence of regular rendering maintenance, even if the claim is separated from the render or building exterior. If proof cannot be provided, then that will likely void any claim made. 

Spectrum carry out regular planned rendering maintenance works for our clients, so if you have any questions please do contact the team. 

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