Hampshire · England

Knightwood Fire Rated Sealant

Fire-stopping gaps in Knightwood need attention? We cut out the old, prepare the joints and apply the right sealant.

  • Gaps around pipes and cables through fire-resisting walls
  • Joints picked up in a fire-stopping survey
  • New service routes left unsealed after building work

Book fire rated sealant in Knightwood

DIY versus a professional finish

Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.

What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.

Fire rated sealant for homes and businesses in Knightwood

Fire-rated sealant closes the gaps around pipes, cables and frames where they pass through a fire-resisting wall or floor. We apply intumescent and fire-rated sealants to the manufacturer’s tested details for each gap. We work on plasterboard & masonry, pipe & cable gaps and door frames, and people most often call us about joints picked up in a fire-stopping survey and gaps left after a refit or conversion.

If you run a pub, café, guest house or shop in or near Knightwood, the washrooms and kitchen need the same attention as a big site.

A one-year guarantee comes as standard, so you are covered after we have gone.

Eleven members of the Mr Mastic team standing in front of branded white vans
Place
Knightwood (SO53, SO52)
Wider area
Hampshire
Guarantee
One year on every job
Quotes
A clear quote up front
Call
0345 464 0079
Updated
26 October 2026

Surface by surface

Linear gaps

A linear joint may need to allow for movement as well as fire. The product and depth are chosen to suit both, following the tested detail.

Masonry and concrete

For masonry and concrete, we use a product tested in that substrate. We clean out dust and debris before sealing so the seal has something sound to bond to.

How the visit works

Good joint work is mostly preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. All told, the work takes from a few hours to a few days, depending on the number of gaps and the access. Parking around Knightwood is normally easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.

  1. We plan the order of work and access, floor by floor or flat by flat.
  2. Old, damaged or unsuitable sealant is removed.
  3. Gaps are cleaned of dust and loose material.
  4. We apply and tool the sealant to the product’s tested detail.
  5. We record what was done and flag anything that needs a different system.

Preparing for the visit

  • Let us know about earlier repairs to the joints
  • Mention any leaks or damp you’ve noticed
  • Try not to wet indoor joints just before the visit

Ask for a quote

Asking for a quote is easy: tell us what needs doing and where. Photos by email help us understand the job, and we will come back to you with a quote.

Get a price

Read more

Workplaces and buildings in Knightwood

In England, the Regulatory Reform (Fire Safety) Order 2005 requires a fire risk assessment for workplaces and for the common parts of blocks of flats, and gaps around services are often picked up there. We work to the specification you’re given, installing the product to its tested details.

If you look after a church, hall or community building such as St Francis, older buildings that have had new heating or wiring often have service gaps worth checking. For landlords with property near Chandlers Ford station, fire-rated sealant around pipes and cables through walls and floors needs making good whenever new services go through.

Knightwood is about 1 mile west of Chandler's Ford, in Hampshire. For fire rated sealant in and around Knightwood, it’s easy to get a quote: please call 0345 464 0079 or drop us an email. We’re based in Crawley and cover Hampshire. We cover 683 towns and villages across Hampshire, from the larger towns to small villages.

Work in SO53 and SO52 is quoted and booked the same way as anywhere else. Fire rated sealant is available to properties on Foyle Road, Harvest Road and Flexford Road and the roads around them. Nearby, we also carry out fire rated sealant in Chilworth Old Village (2 miles south-west), Chilworth (2 miles south), North Baddesley (2 miles west), Toothill (3 miles south-west) and Bassett (3 miles south). We also work in nearby towns such as Winchester (6 miles north-east), Eastleigh (3 miles south-east), Fareham (13 miles south-east), Totton (7 miles south-west), Hedge End (7 miles south-east) and Romsey (4 miles west).

Landmarks near Knightwood

Typical jobs here are in homes near Toynbee School and the streets around them. For rail, the closest station is Chandlers Ford station, roughly 0.8 miles south-east of the centre. Other landmarks nearby include Romsey Community Hospital (3.5 miles west) and Eastleigh Museum (2.5 miles south-east). For a walk, there’s Flexford Nature Reserve.

Map of Knightwood © OpenStreetMap contributors

Your questions about fire rated sealant in Knightwood

I let a flat near Chandlers Ford station. Can you help?

Yes, we work for landlords and agents. Just phone 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear quote.

Is Knightwood within the area you cover?

Yes, we do. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.

Is the work guaranteed?

Yes. Each job is guaranteed for twelve months, large or small.

Can you match the sealant colour?

We’ll suggest a colour to suit the surroundings. The choice depends on the product the joint needs.

Will you assess my building’s fire safety?

No, assessment isn’t something we do. Once you have a specification or action list from your assessor or designer, we can quote for the fire-rated sealant items.

How long does fire rated sealant take?

As a guide, most jobs take from a few hours to a few days, depending on the number of gaps and the access. Bigger jobs take longer, and we’ll tell you how long to expect.

Do I need to be at home?

If the work is inside, we need someone to let us in. Once we’ve agreed the job, you do not need to watch us work.

Are you fully insured?

Yes. We’re fully insured for every job we do.

How to look after the new joints

How long the joints last depends on use and care. Here’s what we suggest:

  • Plan fire stopping into any work that goes through walls or floors
  • Ask every contractor to reseal any fire stopping they disturb
  • Never patch a fire seal with standard sealant
  • Photograph sealed gaps before they’re covered up

File the record of locations and products with your fire safety paperwork. It saves time at the next inspection or assessment.

A gap left open in a fire-resisting wall or floor lets smoke spread in ways the building wasn’t designed for. Closing it is normally a straightforward job.

Work for landlords, hotels and businesses

Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. We can quote for more than one property at once.

Letting agents often deal with us directly. Tell us the address, the job and how access works.

When to call us in Knightwood

Lots of unsealed gaps appear long after the building was completed. Electricians, plumbers and data installers drill through walls and ceilings and the hole they leave doesn’t always get resealed.

If you can see any of these, it’s time to have the joints looked at:

  • Gaps filled with a product that is not fire-rated
  • Joints picked up in a fire-stopping survey
  • Linear gaps at the head of walls
  • Damaged fire sealant left by other trades

If you look after a building such as Knightwood Primary School, gaps opened by contractors for new cabling are a common finding in schools and offices.

Before booking anyone

  • What product goes in the joint
  • How long the guarantee is
  • Whether all the old sealant comes out first
  • Whether VAT is included

10 questions to ask before you book

When something else is needed

It helps to know what we can’t do:

  • Problems with the door itself rather than the gap around the frame
  • Large holes that need a different fire-stopping system
  • Sign-off of the building, which sits with building control or your assessor

If in doubt, phone 0345 464 0079 or drop us an email and we’ll say what we think before booking.

Surfaces we seal

  • Door frames
  • Flats & HMOs
  • Linear gaps
  • Pipe & cable gaps
  • Service penetrations
  • Plasterboard & masonry
20+ yearsMastic and sealant specialists
ARBOMaster approvedApproved applicator for Arbo sealants
Fully insuredDomestic, commercial and hotels
One-year guaranteeOn every job