Cavity Wall Insulation

35% of your home’s heat is lost through its walls. Homes with cavity walls can be insulated to retain heat and save on energy bills.

What is cavity wall insulation?

If your home was built within the last 100 years, it’s likely you have a narrow cavity between your exterior and interior walls to prevent rainwater from permeating inside. 35% of your home’s heat is lost through its walls, and this cavity is a big contributor to that. Fortunately, it can be filled using “blown-in” insulation material injected into the wall through small drill holes, to trap heat and save energy.

How does cavity wall insulation work?

Our installers will drill small ~22mm wide holes at intervals around the outside of your property. Through these holes, we inject tiny polystyrene beads, which prevent up to 70% of heat loss through your walls and excel at filling tight cavity spaces that might be missed by insulating wool or foam. The beads are bonded with an adhesive into a strong layer of insulation, and we fill the drill holes with colour-matching mortar mix to an almost invisible finish. And that’s it!

SCIS Imperial beads

We use our own brand of polystyrene insulation beads, SCIS Imperial beads, which are 20% more efficient than traditional insulation. These beads are highly durable, water-resistant and rot-proof. Our install process ensures 100% cavity fill with no cold spots and minimal drill holes required, and because the beads are injected directly into the cavity, there’s no leftover waste to clean up. Imperial beads are BBA approved with a 25-year guarantee.

How can my home benefit from cavity wall insulation?

Defeat dampness and boost air quality.

Eliminate damp, mould and condensation from your home. With proper ventilation, you'll benefit from fresh air free of harmful pollutants and lingering odours.

Better for your wallet and the planet.

A better insulated home makes for more efficient heating usage, which means up to 30% off your energy bills and a reduction in your carbon footprint.

Enjoy a more cosy and more valuable home.

You'll feel the warmth and comfort of a well-insulated home right away, and it can boost the value of your property by as much as 3% as well.

“I wanted to show my appreciation for the work that your team carried out at my property last year. Although I was unsure whether I should contact you, your very knowledgeable team filled me with confidence so I decided to proceed. The cavity wall extraction that I had done has completely sorted out the damp I found inside my living room. Thanks to you and your team. I will surely be recommending SCIS to anyone who asks.”

Debra, Winchester
Debra, Winchester

“Thank you for all the team at SCIS for the extremely professional service that you have delivered in our properties for our tenants. I was particular impressed with the detail and knowledge throughout the process. The guidance during initial consultation and survey through to the quality of after care following installation was exceptional. Thanks again.”

Sue, Portsmouth
Sue, Portsmouth

The whole process of having cavity wall and loft insulation fitted by SCIS was utterly professional from start to finish. They arrived promptly and the initial survey was thorough. They took the time to explain the whole process so there were no surprises. Their attention to detail was fantastic and they did a great job of cleaning and tidying up after the job was finished. Most importantly, the insulation has made a huge difference to the warmth of our house which is wonderful! We wouldn’t hesitate to recommend SCIS to anyone.