About Us

Insulation specialists, not general builders

ThermaSeal started in 2004 with one rig and one promise: survey it properly, spray it properly, leave it clean. Twenty years and 2,400 projects later, that hasn’t changed.

20+ Years Experience

Thousands of cavities sealed since 2004.

Qualified Team

Certified, insured and safety-trained crews.

Quality Materials

Closed and open cell foam we stand behind.

Professional Installation

Measured depth, clean sites, no shortcuts.

Our story

We began fitting lofts for local homeowners who were tired of cold upstairs rooms. Word travelled, and within a few years we were sealing warehouse roofs and cold stores across the region. Today we run five rigs and a survey team, but every job still gets the same site visit before a price is issued.

Our installers are directly employed, manufacturer-trained and continuously assessed on depth accuracy, substrate prep and site protection. We never subcontract a spray.

Accreditation & cover

Manufacturer-approved installer for open and closed cell systems
£5m public liability and full employer’s liability cover
Site-safety and confined-space certified operatives
25-year workmanship warranty on every installation
Full depth records and photographic sign-off pack

Why Choose Us

The difference is in the prep, not just the foam

Anyone can pull a trigger on a spray gun. We win repeat work because of the survey before it and the clean-down after it.

2,400+

Projects completed

20+

Years in trade

4.9★

Average rating

Honest surveys, fixed quotes

We measure and price the job properly. No surprise extras once the rig arrives.

In-house crews only

The team on your site is on our payroll — never subcontracted, never rushed.

Clean sites, protected finishes

Full masking, extraction and a tidy handover on every single installation.

25-year workmanship warranty

Backed by manufacturer-approved materials and full public liability cover.

How It Works

Five steps from first call to sign-off

01

Inspection

A surveyor assesses access, moisture, ventilation and existing insulation.

02

Quote

A written, fixed-price specification with foam type, depth and timeline.

03

Preparation

Masking, sheeting, extraction and safe isolation of the work zone.

04

Spray Application

Foam applied in controlled lifts and checked for depth as we go.

05

Completion

Trim, clean-down, sign-off photos and your warranty paperwork.

FAQs

Frequently Asked Questions

What Is Spray Foam Insulation Used For?

Spray foam insulation is used to maintain a temperature balance in your home or commercial setup. It reduces and improves heat transfer and air movement in areas such as roofs, walls, sheds, commercial buildings, and underfloors.

Is Spray Foam Suitable for Sheds?

Yes. Shed spray foam insulation can help make a shed more comfortable and usable by reducing heat transfer, draughts, and unwanted air movement. It improves air circulation and keeps the inside environment comfortable.

Can You Install Underfloor Spray Foam Insulation?

Yes. Underfloor spray foam insulation can be considered where cold floors, draughts, or difficult-to-seal gaps are affecting comfort. The underfloor area needs to be assessed first for access, moisture, and suitability.

Do You Work on Commercial Buildings?

Yes. We provide spray foam insulation for commercial buildings including warehouses, factories, offices, and other large spaces. Projects can be planned around operational requirements where practical.

Have a commercial or industrial project?

Contact the Spray Foam Insulators team for project pricing, specifications and technical advice.