Hertfordshire · England
Fire-rated sealant in Wallington, Hertfordshire
Fire rated sealant across Wallington and nearby, with every bit of old sealant taken out first.
- Damaged fire sealant left by other trades
- Door frames with gaps between frame and wall
- Gaps around pipes and cables through fire-resisting walls
Fire rated sealant in Wallington
Until it’s heated, intumescent sealant behaves like an ordinary sealant; in a fire it expands into the joint. Which product suits a gap depends on its width, the materials either side and what runs through it, so we work to the manufacturer’s details. Common call-outs are for gaps left after a refit or conversion and seals cut through by electricians, plumbers or data installers, across door frames, plasterboard & masonry and pipe & cable gaps.
If you have holiday lets, a converted barn used for business or a community building near Wallington, the washrooms, kitchens and any fire-rated joints need the same care as a big site.
Each job carries a 12-month guarantee, whatever its size.
- Location
- Wallington (SG7)
- Wider area
- Hertfordshire
- Guarantee
- One year on every job
- Quotes
- A clear price before work begins
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Wallington: your questions answered
Is Wallington in your area for fire rated sealant?
Yes. We work across London and the South East, and Wallington is part of that. You can phone 0345 464 0079 or email us and let us know what needs doing.
Do you work for landlords with property near Ashwell & Morden station?
Yes. We work for landlords and agents as well as householders. You can phone 0345 464 0079 or send us an email with the details for a clear quote.
Are you insured?
Yes. Mr Mastic is fully insured, and we’ve been doing sealant work for more than 20 years.
What do you put in the joint?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We will tell you what we are using and why.
Do you provide details of the products used?
Yes. We note each location and the product that went in, so you have it on file.
What’s the difference between intumescent and fire-rated sealant?
Fire-rated is the broad term for sealants tested for fire stopping. Intumescent ones swell in heat, and they’re one of the options. The specification and the tested detail decide which is used.
Is it messy?
No. We protect the surfaces around the joints, and we clear up the old sealant and our materials before we leave.
Do you work in flats, HMOs and commercial buildings?
Yes, whether the building is a school, an office, flats or an HMO, and whether it’s in use or not. Tell us how the building is used and we’ll plan around it.
Landlords, agents and businesses in Wallington
We also work for property managers and facilities teams in Wallington and across Hertfordshire. Several sites can be quoted together, and we are fully insured for the work.
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
What affects the cost of fire rated sealant
Every job gets its own quote. These are the things that affect it:
- How many areas need sealing
- The type of sealant required
- Whether old sealant or filler has to be cut out
- Any working-time requirements on site
What you pay reflects the work, not a rough estimate. That’s why we ask about the job first and agree the price before starting.
Helping us quote
Before you ask for a quote, have a think about:
- The address or postcode of the job
- What’s wrong with the joints now
- Whether it’s a home or a business
- Whether it has been sealed before
We do not publish a price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To arrange one, phone 0345 464 0079 or email us.
What the job involves on each surface
Door frames
Behind most architraves is a gap between frame and wall. We seal any open gap to the product’s tested details before the trim goes back.
Flats and HMOs
Working in occupied flats needs some planning. We agree access to each flat and the common parts before work begins so residents know what to expect.
Honest limits
We will not take on work that won’t last, so these are the limits:
- Big openings where sealant alone is not the tested solution
- Sign-off of the building, which sits with building control or your assessor
- Fire risk assessments, which need a qualified assessor
If in doubt, ring 0345 464 0079 or email us and we’ll say what we think before you book.
What we seal
- Flats & HMOs
- Plasterboard & masonry
- Door frames
- Linear gaps
- Pipe & cable gaps
- Service penetrations
How to look after the new joints
How long the joints last depends on use and care. We suggest:
- Photograph sealed gaps before they’re covered up
- Do not fill fire-stopping gaps with ordinary foam or silicone
- Ask every contractor to reseal any fire stopping they disturb
- Include hidden areas like risers in routine checks
Avoid covering a sealed gap with anything that isn’t part of the tested detail. If it needs repair, use the same type of product. Ask us if you’re not sure which product was used.
Any job that breaks through a wall or ceiling should include resealing. Catching it then saves a separate visit later.
What we do, step by step
When we arrive, we look over the joints with you first, so you know exactly what we are doing. Surfaces next to the work are protected before any work begins. Most jobs take from a few hours to a few days, depending on the number of gaps and the access. For a village or hamlet like Wallington, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- Before starting, we go through the specification or action list with you.
- We measure every gap and note what it’s in and what passes through.
- Unsuitable material such as ordinary foam or silicone is cut out.
- We fit backing where needed and apply the fire-rated sealant to depth.
- We hand over a list of locations and products for your records.
How to prepare
- Try not to wet indoor joints just before the visit
- Let us know if you’ve seen damp or leaks
- Let us know about parking restrictions
Getting a quote
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job, and we will take it from there.
Advice
Also near Wallington
More services for Wallington
Fire rated sealant in Wallington: local notes
Workplaces and the common parts of blocks of flats in England need a fire risk assessment under the Regulatory Reform (Fire Safety) Order 2005, and gaps around services are often picked up there. We work to the specification you’re given, installing the product to its tested details.
Rented homes near Ashwell & Morden station change hands often, and any gap left by new services in shared walls should be closed with a fire-rated product.
Wallington is about 5 miles east of Letchworth, in Hertfordshire. Homes, rented property, offices and hotels in Wallington is covered for fire rated sealant, old or new, large or small. Every job comes with our one-year guarantee. Our area takes in 381 places across Hertfordshire, from the larger towns to small villages. We also work in Chelmsford, about 31 miles from Wallington.
We cover every part of SG7 for fire rated sealant and the streets around it. Fire rated sealant is available to properties on The Street and Kit's Lane and the roads around them. Neighbouring places we cover for fire rated sealant include Clothall (2 miles south-west), Baldock (3 miles west), Weston (3 miles south-west), Walkern (5 miles south) and St Nicholas (5 miles south-west). Larger places within reach include Stevenage (6 miles south-west), Bishop's Stortford (14 miles south-east), Welwyn Garden City (14 miles south), Harpenden (15 miles south-west), Hitchin (7 miles west) and Hertford (13 miles south).
Local landmarks in Wallington
Wallington’s nearest station is Ashwell & Morden station, roughly 2.9 miles north. Other landmarks nearby include Ashwell Village Museum (3.9 miles north-west) and Fairfield Hospital (5.6 miles west). The countryside around Wallington includes Hawkins Wood.
When to call us in Wallington
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.
The problems people generally mention when they call are:
- Fire stopping disturbed by later work
- Gaps where walls meet ceilings or slabs
- New service routes left unsealed after building work
- Door frames with gaps between frame and wall
Community buildings like Church of St Mary are part of the picture too: service openings in its walls need the right fire-rated sealant, as in any building.
Comparing quotes
- Are they insured?
- Which colour the sealant will be
- How hidden problems are handled
- Which sealant they’ll use, and why