Hertfordshire · England

Fire-rated sealant in Letchworth Garden City, Hertfordshire

Intumescent and fire-rated sealant around gaps, frames and service penetrations in Letchworth Garden City, with a 12-month guarantee on every job. Call for a quick quote.

  • Gaps left after a refit or conversion
  • Open joints along the top of partitions
  • Seals cut through by electricians, plumbers or data installers

Trusted fire rated sealant in Letchworth Garden City

Fire rated sealant in Letchworth Garden City

Later work by other trades often breaks through fire stopping, especially in flats, HMOs, offices and schools. A new cable run or a replaced pipe can leave an open hole behind. We seal them with a product tested for that kind of gap. Common call-outs are for old fire sealant that has split or come away and unsealed gaps around fire door frames, across service penetrations, door frames and plasterboard & masonry.

For anyone managing a school, care home, pub or office in Letchworth Garden City, washroom sealant, kitchen joints and fire-rated sealant around service openings all need upkeep. Out-of-hours working is possible to arrange.

You get a 12-month guarantee, the same in Letchworth Garden City as everywhere else we work.

The Mr Mastic team in navy uniforms in front of three Mr Mastic vans
Where
Letchworth Garden City (SG6, SG7)
Wider area
Hertfordshire
Cover
A year, on every job
Price
A clear quote up front
Telephone
0345 464 0079
Page updated
26 October 2026

When to call us in Letchworth Garden City

Movement in the structure can open gaps too: cracked or debonded sealant leaves an open route through the wall. Damage from cleaning, knocks and maintenance adds to it.

Any of these means the joints need attention:

  • Damaged fire sealant left by other trades
  • Holes left by a change of layout
  • Gaps around pipes and cables through fire-resisting walls
  • Open joints along the top of partitions

Schools such as Pixmore Junior School are buildings too, and fire-stopping around service openings should be restored whenever new services go in.

What your quote should include

  • What product goes in the joint
  • Whether all the old sealant comes out first
  • Who turns up on the day
  • What guarantee comes with the work

Choosing a sealant specialist

What happens if it’s left?

If an assessor has flagged gaps, it makes sense to close them before the next review. Getting them done and written up means you can show the action was taken. Around Letchworth Garden City, failed sealant lets water into hidden places, such as under the floor, behind a panel or into a wall. Left alone, that means rot, damp and a bigger repair.

Combining jobs into one visit is normally more efficient than separate visits, so it’s worth mentioning everything you’d like done. We will send you a clear quote for the lot.

Why us?

  • Every job guaranteed for a year
  • 4.9 on Google from 180+ five-star reviews
  • Anti-fungal silicone where joints get wet
  • Tidy, careful work

Read how sealant jobs are priced or our reviews.

How the visit works

When we get to you, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. Most jobs then take anything from a few hours to several days, depending on how many gaps there are. In Letchworth Garden City, parking is rarely complicated, though it helps to know about driveways or restrictions, and let us know if the work is upstairs, in a flat or up high outside.

  1. Access to each area is agreed so the work can run in order.
  2. Old, damaged or unsuitable sealant is removed.
  3. Dust and loose debris are cleaned from each gap.
  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

  • Tell us if parking is tricky
  • On commercial sites, let us know about site rules
  • Keep pets and children clear of the area while we work

How to get a quote

Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved before giving you a price.

Get a price

Advice

DIY versus a professional finish

Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.

If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.

Letchworth Garden City: your questions answered

Is fire rated sealant in Letchworth Garden City guaranteed?

All our work, in Letchworth Garden City and everywhere else, comes with a 12-month guarantee. We’re also fully insured and ARBOMaster approved.

Can you do fire rated sealant in Letchworth Garden City?

Yes, Letchworth Garden City is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear quote.

I’m a tenant. Can you help?

We are happy to deal with the tenant, landlord or agent. Just make sure your landlord agrees.

Do you provide details of the products used?

Yes. When the job is done, we give you the locations and products. Tell us if your assessor needs it in a particular format.

What’s the difference between intumescent and fire-rated sealant?

An intumescent material expands when it’s heated. Intumescent sealants are a type of fire-rated sealant.

Can you match the sealant colour?

Generally, yes. White, clear and grey are common, and other colours are available, and we’ll agree it with you first.

Is it OK to seal over old sealant?

No, and we never do. It can look neat for a few weeks, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.

How much does fire rated sealant cost in Letchworth Garden City?

The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote and we’ll talk you through it.

Looking after it afterwards

How long the joints last depends on use and care. We suggest:

  • Do not fill fire-stopping gaps with ordinary foam or silicone
  • Allow for resealing whenever new services are run
  • Take photos of fire stopping before ceilings or boxing go back
  • Ask which product was used before you paint

Don’t add foam, filler or ordinary sealant over a fire seal. If it needs repair, use the same type of product. We can tell you which product we used.

An open gap is not only a fire issue: noise, draughts and even pests can come through too. Dealing with them early helps with all of these.

Commercial buildings in Letchworth Garden City

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. Letchworth Garden City was laid out as a garden city in the early twentieth century. Alongside its homes, it has offices, shops, schools and workplaces, each with washrooms, kitchens and fire-rated joints to keep in order.

If you let a flat or house near Letchworth Garden City station, any gap left by new services in shared walls should be closed with a fire-rated product. If you look after a church, hall or community building such as St Michael, older buildings that have had new heating or wiring often have service gaps worth checking.

Letchworth Garden City is about 5 miles north-west of Stevenage, in Hertfordshire. From the centre of Letchworth Garden City to the outskirts, we cover fire rated sealant for every kind of property. Our Hertfordshire coverage runs to 381 places, Letchworth Garden City among them. There’s also a page for London, about 34 miles away.

Jobs for fire rated sealant in SG6 and SG7 works the same way as everywhere else we cover. You’ll find streets such as Pix Road, Field Lane and Ridge Road. With the A505 close by, Letchworth Garden City is simple for us to get to. Nearby, we also carry out fire rated sealant in Letchworth (1 mile east), Willian (1 mile south), Norton (1 mile north-east), Walsworth (2 miles south-west) and Ickleford (2 miles west). We also work in nearby towns such as Stevenage (5 miles south-east), Welwyn Garden City (13 miles south), Harpenden (12 miles south-west), Hitchin (3 miles south-west), Hatfield (15 miles south) and Hertford (14 miles south-east).

Near you in Letchworth Garden City

We work in homes and buildings around Norton School, Three Magnets pub and Church of St Paul, among other places. Letchworth Garden City has its own railway station: Letchworth Garden City station. Other landmarks nearby include Wymondley Castle (2.5 miles south) and Fairfield Hospital (1.8 miles north-west). Open spaces near Letchworth Garden City include Purwell Ninesprings.

Map of Letchworth Garden City © OpenStreetMap contributors

For landlords and businesses

Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. Several properties can be quoted together.

We also work for property managers and facilities teams. Several sites can be quoted together.

Honest limits

It helps to know what we cannot do:

  • Fire doors that need new seals, closers or hardware
  • Fire risk assessments, which need a qualified assessor
  • Issuing a fire rating or certificate for a building

Not sure which it is? You can ring 0345 464 0079 or send us an email and we’ll tell you honestly before you book.

Where we work in Letchworth Garden City

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