The finished home, wrapped in ROCKWOOL stone wool and white silicone render, seen from above

Case study · Shepperton, Surrey

Sian and Pete, in their own words

A cold, damp 1930s family home, now warm, dry and quiet. Insulated with ROCKWOOL.

The 2 minute case study film, made and published by Cotality.

“The thing that we noticed first was the silence. It’s so quiet in here and… sleeping is so much better.”

SIAN

“I think without it you would have been coats on, or heating full on all day long.”

PETE

“She came into the house and said, have you had aircon installed… it was so much cooler in here.”

SIAN, ON A HOT SUMMER DAY

“You had to have the trickle vents put in, so that provides a little bit of vent, just enough.”

PETE

The heating now runs for about two hours in the evening, and the home holds around 18°C until morning.

Insulated with ROCKWOOL

Winner, Small Scale Project
South East Energy Efficiency Awards 2026

Independently verified, then published as our joint case study

Before and after

The same family home, transformed

AFTER

BEFORE

Where it started

A lovely home that was hard to live in

Sian and Pete’s 1930s home is built from clinker block, with no cavity. It lost heat fast. Their gas bills were nearing £2,000 a year.

Black mould grew behind the furniture and inside the wardrobes. There was a damp smell they could not shift. Planes from Heathrow and a busy road added to the noise.

Sian called it “a very difficult property to manage”.

How we did it

Step by step, with one team from start to finish

A whole-home assessment. Cotality, the independent retrofit coordinator, assessed the energy use, the condition of the home and the risk of damp and mould. Our survey picked up the roof overhangs and possible leaks before any work began.

A design for this home. The plan was designed and documented before we started, to PAS 2035. We check every job against our 69-step pre-installation checklist.

Careful preparation. We took down the mock-Tudor timbers and prepared every surface, pipe and fitting.

ROCKWOOL, fitted the right way. We fitted a complete ROCKWOOL Wall Systems external wall insulation system. Each board is bonded with adhesive, then fixed through with mechanical fixings, to the pattern in the design. A dense stone wool board protects the base of the home.

Fresh air, kept under control. A more airtight home still needs fresh air, so we fitted trickle vents and door undercuts. The existing extractor fans already met the standard.

A beautiful finish. Off-white silicone render, with a black plinth and new black rainwater pipes. The neighbours praised the change.

Checked, signed off and guaranteed. Cotality verified the work independently. The job was lodged with TrustMark and handed over with a 25 year insurance backed guarantee.

With thanks to

Sian and Pete

Solid wall insulation installed by

Quality assurance by

Verified by Cotality

An independent second pair of eyes

Cotality coordinated the retrofit and verified our work independently. They are independent of us, and their role protects the homeowner.

Once the work was finished, Cotality filmed Sian and Pete in their kitchen and published the project as our joint case study.

Read our case study, published by Cotality

More reasons to choose ROCKWOOL

What else do you get with stone wool?

Warmth was only part of it. Sian and Pete told us their home is now noticeably quieter.

Stone wool is spun from volcanic rock. It does not burn. It lets moisture escape, so the home stays dry. And its fibres soak up sound. It is the system we recommend for family homes like theirs.

Why we fit ROCKWOOL

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