Hertfordshire · England
Fire Rated Sealant in Redbourn
Intumescent and fire-rated sealant around gaps, frames and service penetrations in Redbourn, with a 12-month guarantee on every job. Ask us for a quote.
- Open joints along the top of partitions
- Open holes round services passing through fire walls
- Holes left by a change of layout
About our fire rated sealant in Redbourn
Bigger jobs can be worked through in stages, flat by flat or floor by floor, noting the locations and products as we go. That record is useful for your files and for whoever looks at the building next. If you are dealing with unsealed gaps around fire door frames and fire stopping disturbed by later work, we can put it right, on linear gaps, plasterboard & masonry and service penetrations alike.
In a smaller place like Redbourn, commercial jobs tend to be smaller buildings: a pub, a surgery, a school, a shop or a few business units. Each needs the same care with its sealant as any larger building.
We stand behind the work with a 12-month guarantee, so you’re covered after we’ve gone.
- Location
- Redbourn (AL3)
- Region
- Hertfordshire
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What sealant work can’t fix
We’ll always be straight with you, so here’s what new sealant won’t do:
- Walls or floors that weren’t built to resist fire
- Deciding what fire stopping a building needs
- Sign-off of the building, which sits with building control or your assessor
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly.
Joints and surfaces we work on
- Pipe & cable gaps
- Service penetrations
- Plasterboard & masonry
- Door frames
- Linear gaps
- Flats & HMOs
Landlords, agents and businesses in Redbourn
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will quote.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
Common questions in Redbourn
I let a flat near Harpenden station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.
Will you come out to Redbourn?
Yes. Redbourn is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you take out the old sealant first?
Always. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Are you fully insured?
Yes. We are fully insured, and we can confirm the details when we quote.
Can you fill the gap behind a fire door frame?
Yes. Gaps behind architraves are a common job for us. The door and its fittings are a separate job for a door specialist.
Do you certify the fire stopping?
We do not certify fire stopping or quote ratings. Our part is installing the specified product to its tested details and giving you a record of where it went.
What does intumescent mean?
Fire-rated sealant covers any sealant tested for use in fire stopping. Intumescent types expand when heated, and they’re one option among several. We use whichever the specification and tested details call for.
How do I get a quote for fire rated sealant in Redbourn?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Nearby places to Redbourn
Also in Redbourn
Why it’s worth doing now in Redbourn
If an assessor has flagged gaps, it makes sense to close them before the next review. Having them sealed and recorded now means you can show the action was taken. In an older home around Redbourn, damp from a failed joint can get into timber and plaster, which is far harder to put right than the sealant itself.
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you’re unsure, phone 0345 464 0079 or drop us an email for an honest opinion and a quote.
Why choose Mr Mastic in Redbourn
- Old sealant always removed completely
- Full insurance on every job
- Domestic, commercial and hotel work
- Arbo and Everbuild products
Take a look at what affects the cost or our reviews.
How to look after the new joints
No joint lasts for ever, but care makes a real difference. A few tips:
- Don’t fill fire-stopping gaps with ordinary foam or silicone
- Photograph sealed gaps before they’re covered up
- Keep the record of products and locations with your fire safety documents
- Plan fire stopping into any work that goes through walls or floors
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 are not sure which product was used.
Open gaps do not only matter in a fire: noise, draughts and even pests can come through too. Sealing them early helps on every front.
Can I do it myself?
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 fails, we can still redo it.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
How the visit works
Once we are on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. Most jobs then take a few hours for a handful of gaps, and longer for a whole building. For a job in Redbourn, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- We start with the survey or action list, checking the size and surfaces of every gap.
- We remove any old or unsuitable filler and clean the gap.
- 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.
- Locations and products are noted so you have them on file.
Before we arrive
- Keep children and pets away from the work area
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any parking rules near the property
Get a quote
Getting a quote is simple: tell us what needs doing and where, and roughly how big it is. Photos by email help us understand the job, and we will take it from there.
Read more
Common problems we fix in Redbourn
Gaps also open up as buildings move: cracked or debonded sealant leaves an open route through the wall. Damage from cleaning, knocks and maintenance adds to it.
Keep an eye out for these signs:
- New service routes left unsealed after building work
- Cracked or shrunken fire-rated sealant
- Seals cut through by electricians, plumbers or data installers
- Linear gaps at the head of walls
Rented homes near Harpenden station change hands often, and fire-rated sealant around pipes and cables through walls and floors needs making good whenever new services go through.
What your quote should include
- What preparation is included
- How long to leave it before use
- Whether VAT is included
- Is the old sealant removed completely?
Fire rated sealant around Redbourn
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 apply fire-rated sealant to the assessor’s or designer’s specification and the product’s tested details.
If you look after a church, hall or community building such as Mount Zion Evangelical Church, older buildings that have had new heating or wiring often have service gaps worth checking. Managing a site like Redbourn Primary School? Then fire-stopping around service openings should be restored whenever new services go in.
Redbourn is about 2 miles south-west of Harpenden, in Hertfordshire. If you need fire rated sealant in Redbourn, please call 0345 464 0079 or send us an email for a quick quote. We are based in Crawley and cover Hertfordshire, Redbourn included. Redbourn is one of 381 places in Hertfordshire we cover for fire rated sealant. London is on our list too, about 25 miles from Redbourn.
Every address in AL3 is within our area for fire rated sealant, from the main roads to the quietest streets. Fire rated sealant is available to properties on High Street, The Square and Lords Meadow and the roads around them. Nearby, we also carry out fire rated sealant in Holtsmere End (2 miles south-west), Highfield (3 miles south-west), Westwick Row (4 miles south), Leverstock Green (4 miles south) and Adeyfield (4 miles south-west). Larger places within reach include Watford (9 miles south), Hemel Hempstead (4 miles south-west), Stevenage (12 miles north-east), St Albans (4 miles south-east), Welwyn Garden City (9 miles east) and Hitchin (12 miles north-east).
Landmarks near Redbourn
We work in homes and buildings around The Bell And Shears Public House, Roundwood Park School and Rothamsted Park, among other places. Redbourn’s nearest station is Harpenden station, about 2.3 miles north-east of the centre. Nearby you will also find Redbourn Museum (under half a mile south-east) and St Albans City Hospital (3.6 miles south-east). Green spaces nearby include Grebe House Wildlife Garden and Verulamium Lake.