West Sussex · England
Fire Rated Sealant in Keymer
Professional fire rated sealant in and around Keymer, with old sealant always removed completely and a one-year guarantee.
- Unsealed gaps where pipes and cables go through a wall
- Gaps flagged on a fire risk assessment
- Cracked or shrunken fire-rated sealant
Fire rated sealant for homes and businesses in Keymer
We do not assess buildings or decide what fire stopping is needed; your assessor, designer or building control sets that out. Our part is applying the specified sealant carefully, to the right depth and with the right backing. If you’re dealing with gaps flagged on a fire risk assessment and new service routes left unsealed after building work, we can help, whatever the surface.
Around a place like Keymer, halls, schools and small businesses all have washrooms and kitchens used by many people. Sealant and fire-rated joints there matter as much as in any larger building.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we will put it right.
- Place
- Keymer (BN6)
- Region
- West Sussex
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Keymer questions
Do you take on hotel work around Keymer?
Yes, hospitality work, including hotels, is part of what we do. Jobs can be programmed room by room, with out-of-hours working possible to arrange.
Can you help a landlord with a rental near Hassocks station?
Yes, we work for letting agents and landlords. Just ring 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear quote.
Do you have insurance?
Yes. Mr Mastic is fully insured.
Should I try DIY first?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Is the work guaranteed?
Yes. All our work carries our one-year guarantee.
Can you do several jobs on one visit?
Yes. Just list everything you need and we’ll quote it together.
Will there be a smell?
There can be a smell while the sealant cures. Opening a window helps.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status.
Why deal with it now?
Squirting in whichever sealant is nearest does not make a fire seal. Fire-rated products are tested in set gap sizes, depths and substrates, so both the product and the method matter. In an older home around Keymer, damp from a failed joint can get into timber and plaster, which is far harder to put right than the sealant itself.
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Why us?
- Anti-fungal silicone where joints get wet
- Quality sealants from Arbo and Everbuild
- 180+ five-star Google reviews
- 12-month guarantee on every job
Take a look at our cost guide and our reviews.
Common problems we fix in Keymer
Gaps also open up as buildings move: a seal that cracks or pulls away leaves a path for smoke. Damage from cleaning, knocks and maintenance adds to it.
Most people get in touch when they notice one of these:
- Gaps left after a refit or conversion
- Gaps flagged on a fire risk assessment
- Linear gaps at the head of walls
- Door frames with gaps between frame and wall
If you look after a church, hall or community building such as St Cosmas and St Damian Church, service openings in its walls need the right fire-rated sealant, as in any building.
Comparing quotes
- Who turns up on the day
- What the cure time is
- Is VAT in the price?
- What preparation is included
Commercial buildings in Keymer
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 apply fire-rated sealant to the assessor’s or designer’s specification and the product’s tested details. Keymer has hotels and guest accommodation in and around it. For hotels, a room-by-room programme keeps most rooms in use while the work goes on.
Letting a property close to Hassocks station? Then fire-rated sealant around pipes and cables through walls and floors needs making good whenever new services go through. Managing a site like The Windmills Junior School? Then service openings in fire-resisting walls need checking after any refurbishment.
Keymer is about 2 miles south of Burgess Hill, in West Sussex. Homes, rented property, offices and hotels in Keymer is covered for fire rated sealant. Every job comes with our 12-month guarantee. Across West Sussex, we cover 371 places, and Keymer is one of them. There’s also a page for Brighton, about 6 miles away.
Postcode districts we cover here for fire rated sealant: BN6. Local streets include Flowers Close, The Quadrant and Kymer Gardens, all of which we cover. We also cover the places around Keymer: Hassocks (1 mile west), Ditchling (1 mile east), Clayton (1 mile south-west), Hurst Wickham (1 mile north-west) and Westmeston (2 miles south-east). Larger places within reach include Crawley (13 miles north), Horsham (13 miles north-west), Worthing (14 miles south-west), Haywards Heath (5 miles north), East Grinstead (15 miles north) and Shoreham-by-Sea (8 miles south-west).
What’s near Keymer
Locally, jobs take us to homes and businesses close to The Greyhound Public House and Downlands Community School and the streets around them. For rail, the closest station is Hassocks station, about 0.5 miles west. Well-known places in the area include The Dene Hospital (3.2 miles north-west) and Clayton Castle (1.2 miles south-west). Not far away are Ditchling Beacon and Bedelands Farm Nature Reserve.
What the job involves on each surface
Plasterboard walls
Service holes in plasterboard are often rough and oversized. Gaps that are too big for sealant alone need a different detail.
Door frames
A door can only do its job if the gap behind its frame is sealed too. We fill it with a fire-rated product suited to the materials either side.
Can I do it myself?
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
What affects the quote in Keymer
The price is agreed before any work begins. It takes into account:
- The size of the job
- Any mould that needs treating
- How many rooms, windows or areas are involved
- When we can work, for business premises
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all play a part.
Asking for a quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- Pictures of the joints, sent by email
- The rough size of the job
- Access, such as stairs, a lift or height
- Whether it’s a home or a business
If you are in Keymer and need fire rated sealant, call 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
Keeping the joints in good condition
After the cure time, these simple habits help:
- Look in service cupboards and ceiling voids from time to time
- File the fire-stopping record where your assessor can find it
- Ask which product was used before you paint
- Plan fire stopping into any work that goes through walls or floors
Let contractors know where fire stopping has been done, and ask them to reseal anything they cut through. Later work is a common cause of damaged fire stopping.
When you plan work that goes through walls or ceilings, plan the fire stopping too. Doing it at the time avoids leaving gaps behind.
Nearby places to Keymer
More services for Keymer
How the visit works
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, do the work and tidy away. It normally takes anything from a few hours to several days, depending on how many gaps there are. Parking around Keymer is usually 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.
- We go through the gaps on your list or survey and check each one’s size and substrate.
- Anything that is not fit for the job comes out, and the gap is cleaned.
- We put in whatever backing or fill the product detail specifies.
- We apply the fire-rated or intumescent sealant to the specified depth and tool it.
- We record the locations and products used for your records.
Preparing for the visit
- Tell us if parking is tricky
- Tell us about any previous sealing or DIY attempts
- For indoor joints, keep the area dry beforehand if you can
Getting a quote
Asking for a quote is easy: let us know the job and the location. Photos by email help us understand the job, and we’ll take it from there.