Commercial Mastic Sealant in London
Experienced mastic supply and application
Operating for over 50 years, SD Team are industry-leading specialists in the supply and application of mastic and silicone sealants. Our experienced sealant applicators work on residential developments, commercial buildings and industrial projects, with dedicated teams regularly operating across Greater London.
Our sealant services in London
We cover a wide range of mastic sealant applications, ensuring precision, durability and a flawless finish.
Internal and external window frames
Our highly qualified sealant applicators specialise in mastic window sealing and repair, delivering a neat, consistent finish. We focus on airtight, watertight joints that support both energy efficiency and visual quality for London projects.
Internal and external door frames
We provide expert mastic application around internal and external door frames in a full range of materials. For external doors, we specify weatherproof, UV-resistant sealants to protect against rain, sunlight and long-term discolouration in busy urban environments.
Glass to glass
Our team bonds glass pane joints using high-performance silicone sealants with excellent resistance to UV exposure and temperature fluctuation. This is ideal for shopfronts, curtain walling, glass balustrades and internal glass partitions.
Skirting
We support fit-out and refurbishment contractors with precise mastic sealing to skirting boards, joints and architraves. Our applicators achieve crisp, smooth lines that complement high-end finishes and help prevent dust traps and visible gaps along junctions.
Expansion joints
We install and repair mastic sealant to expansion joints across the building envelope, including vertical and horizontal joints. The products we use are selected to maintain long-term performance in car parks, structural elements and external facades.
Acoustic sound proofing
Our acoustic mastic specialists apply flexible, long-lasting sealant that does not dry out or shrink. These sealants support soundproofing performance in meeting rooms, apartments, schools and other noise-sensitive spaces across London.
Air test jointing
If work is required following an air test, our team will identify weak points, gaps and penetrations contributing to air leakage and then apply appropriate mastic sealants to these joints and interfaces.
Fireproofing
We apply tested, fire-resistant mastic sealants with defined fire protection capabilities to help limit the spread of fire, smoke and toxic gases. Typical applications include linear joints, service penetrations and compartment lines.
Lead work sealing
For roofing joints, gutters, downpipes and vent details, our team seals lead to a variety of substrates, including brick, stone and concrete. We use sealants designed to cope with thermal movement and weather exposure on London roofs.
Floor saw cut joints
We provide flexible mastic sealant solutions for saw-cut joints in concrete slabs, including warehouses, logistics hubs, garages and forecourts. Correct sealing helps protect joint arises, reduce damage from vehicle traffic and extend the life of the floor.
Swimming pools
We use specialist swimming pool joint sealants and chlorine-resistant products within pool areas, along with anti-fungal silicone sealant for surrounding areas such as changing rooms, showers and washroom facilities.
Sealant services case studies
Expertly finished sealant applications
Mastic Sealants FAQs
These are some of the most asked questions about our mastic services in and around London. If you can’t find the answer you’re looking for, please get in touch and our team will be happy to help.
What types of mastic sealant services do you offer in London?
We offer a comprehensive range of mastic and silicone sealant services for London-based projects, including window and facade sealing, bathroom and kitchen sealing, curtain wall and glazing joints, expansion and movement joints, acoustic mastic, fire-rated mastic, swimming pool and leisure sealing, saw-cut floor joints and specialist detailing around doors, skirting and internal finishes. We can work to your specification or advise on suitable sealant systems based on drawings, performance requirements and site conditions.
Do you handle large-scale and specialist projects in London?
Yes, we regularly deliver large-scale mastic sealant packages and specialist works across Greater London. Our teams are experienced in working on residential developments, commercial offices, retail schemes, healthcare and education projects, industrial units, infrastructure and public-sector buildings. We understand the demands of city-centre logistics, multi-contractor sites and tight programmes, and we plan labour and sequencing to integrate smoothly with other trades while maintaining a high level of workmanship.
Do you offer fire-rated and acoustic mastic sealant solutions?
Yes, we provide both fire-rated and acoustic mastic sealant solutions. For fire protection, we use tested fire-resistant sealants with documented performance to help maintain compartmentation and slow the spread of fire, smoke and hot gases at joints and service penetrations. For acoustic performance, we apply specialist acoustic mastic that remains flexible and resists shrinkage, helping reduce sound transmission between rooms and floors in busy commercial and residential buildings throughout London.
Can you maintain or replace existing mastic sealant?
Yes, we carry out mastic re-sealing and maintenance across London. Over time, existing sealant can crack, detach, discolour or lose elasticity, which can lead to air leakage, water ingress or visible defects. Our applicators remove failed sealant, prepare the substrates correctly and install new, compatible mastic or silicone sealant to restore performance and appearance around windows, doors, wet areas, expansion joints and high-traffic floors.
Get started
If you would like to work with specialist mastic and silicone sealant applicators in London, get in touch with us to discuss your project. We can arrange a site visit or review your drawings and specifications, then provide a clear, competitive quotation and a programme that fits your schedule and budget.