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Working with the best housing builders in the UK

Sealant experts based in County Durham,
offering mastic services to the housing sector

Instaseal have a team of highly trained and experienced mastic installers.

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Having worked with some of the biggest names in the business, our team have seen it all.

Our attitude toward problem solving is outstanding where we always find a way.

We will consult with you 1 to 1 early in the project to ensure we remove any problems from the start. We have a large client list who return because of the outstanding service we provide time and time again.

You will find our services are completed to a very high standard, prompt, reliable and very flexible. We understand the industry of construction and the flexibility required to ensure you get what you need from your sealant team.

Working to your schedule, our mastic installation team will ensure a whole house is completed in highly efficient times.

We have a number of mastic and silicone solutions that incorporate all the requirements for the housing property. These vary from fire retardant silicones to glass on glass silicones. If the property requires sealant of any kind, Instaseal can provide the service you require.

Our sealant application services for housing sector include:

  • Internal and external window frames

  • Internal and external door frames.

  • Sanitary & Kitchen Sealants.

  • Glass to glass.

  • Tile/wood to skirting joints.

  • Expansion joints.

  • Acoustic sound proofing.

  • Air test jointing.

  • Fire seal.

  • Lead work.

  • Sealing Floor saw cut joints.

  • Swimming pools.

  • Cut out and reseals.

Internal & External Precision Finishing

Instaseal seal of quality is our promise to you. Precision finishes on all projects large or small.

Saw Cuts and Concrete Floor Expansion Joints

Working with us from early in the projects can help us identify any joints that may cause issues later on. Cracked joints, which are often caused by movement, can be avoided with the correct product. We just happen to know how to apply it too.



We can apply A-Grade security sealant which is mainly used in prison and secure units. This mastic is strong and durable and requires skilled application.


Our robust product for bathrooms and kitchens come in a variety of colours to ensure a finish to match the installation. Our mastic installation team ensure a great finish to a fantastic product that creates a high quality appearance.

Window & Door Perimeters


Glass to Glass

Glass connections require a highly professional approach to sealant. With such a striking image a glass connection can provide, it is important to get this one right. Our sealant application team know how to install the right product in the right way.

If you have any questions before the project begins, we are on hand to provide consultation to ensure the job is completed right first time.

Contact our team for more information.

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