Transform Your Cold Bay Windows

Achieve Up to 50% Thermal Uplift

Old bay windows and solid walls are among the biggest cause for heat loss and black mould in old homes around Warwickshire

At SD Roberts Plastering & Wall Insulation, we specialise in bay window insulation solutions for homes in Coventry and Warwickshire and can offer a number of systems to fix these drafty culprits.

Did you know that uninsulated bay windows can account for up to 50% of heat loss in older properties? Not only does this increase your energy bills, but it can also lead to damp, mould problems, and an uncomfortable home environment.

SD Roberts Plastering & Wall Insulation 

Your Local Experts in Bay Window Insulation and Solid Wall Heat Loss Solutions

For more than 20 years we have been installing high quality insulation and retrofit solutions into ageing and poorly insulated homes around Warwickshire.

Bay windows make up a large part of our work because in old homes with no insulation these bay windows are literally sucking heat and are extremely thermally inefficient which often results in damp problems.

Our tailored retrofit solutions are designed to improve thermal efficiency, reduce draughts, and eliminate condensation issues, giving you a home that's warmer, healthier, and more energy-efficient.

Timber Frame & Tile

Oriel style projected bays usually have no insulation between the timber stud and tile nor do they offer any kind of draft seal within the fabric and so these bays are particularly cold and a common problem being the build up of black spot mould due to condensation forming on the interior surface.

Another problem with this structure is the transfer of airborne sound and traffic noise which can easily penetrate through into the home due to lack of mass and insulation materials.

Rooms with this style of bay will be extremely cold through winter and difficult to heat up as shown in the case study video below many customers try to draft proof the bays themselves using weather strips, sealants and fleece lined wallpaper unfortunately this approach will not raise the thermal resistance of the bay enough and so cold and condensation problems persist.

Solid brick & render

Old homes with solid walls and cracked render are particularly prone to cold and damp problems. Without insulation, solid walls and brick built bay windows provide little resistance to heat loss, making these homes colder and less energy-efficient. Just like timber and tile built bays  the interior cold surfaces can lead to condensation, especially in winter, creating the perfect environment for damp and mould growth.

Cracked render exacerbates the problem by allowing rainwater to penetrate the walls. Over time, this moisture gets trapped, worsening the damp issue. In extreme cases, this can compromise the structural integrity of the bay and lead to further deterioration.

Addressing these issues involves repairing damaged render, adding  internal wall insulation, and ensuring proper ventilation to reduce condensation. Taking these steps not only improves comfort but will save on heating costs in a big way.

Mould and Damp..

Black mould on old bay windows is typically caused by a combination of moisture, poor ventilation and a lack of insulation. Here's a breakdown of the main causes:

1. Condensation

Bay windows often have less insulation than other walls, especially in older properties. This leads to cold surfaces where warm, humid air condenses.

Persistent condensation creates a damp environment, perfect for mold growth.

2. Poor Ventilation

Inadequate airflow in the bay area traps moisture. This is common in spaces with heavy curtains, furniture close to the windows, or blocked vents.

3. Penetrating damp

Gaps in window frames, deteriorated seals, shot mortar beds or render, high ground levels.. All can allow rainwater to seep into the bay and begin to create damp issues inside.

Wooden window frames that absorb moisture can exacerbate the problem.

4. Insufficient Insulation

Older bay windows  lack proper insulation, causing cold spots where mould thrives.

Thermal bridging (cold spots caused by heat transfer through materials) can also contribute.

5. Exterior Issues

Blocked or damaged gutters and downpipes can lead to water infiltration and penetrating damp.

Cracks or gaps in exterior masonry can let moisture penetrate the walls around the window.

6. High Indoor Humidity

Activities like cooking, showering, or drying clothes indoors increase humidity, especially if there isn’t adequate extraction or ventilation. Moisture inside the home is attracted to the coldest surfaces and in most cases this will be poorly insulated bay windows.

The image below shows a PIR insulation install on a project in Warwickshire where we achieved a 50% thermal uplift on a cold damp bay window readings taken before and after using thermal imaging.

Why choose us to undertake the project?

Over the last couple of decades Stuart from SD Roberts Plastering & Insulation Warwickshire has built up a solid reputation for delivering consistent results for his customers who have left many 5 star reviews across different third party review platforms online this feedback reflects Stuarts competency and commitment to providing high quality workmanship and customer service in the local area.

We are a fully insured local business we only use BBA approved products and materials all of our work comes fully guaranteed.

If you have a cold, damp bay window and would like a free quote to fully insulate the bay then please get in touch using our customer contact form below  

Please note our service area is Warwickshire only