Hertfordshire · England
Fire-rated sealant in Colney Heath, Hertfordshire
Fire-stopping gaps in Colney Heath need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Unsealed gaps around fire door frames
- Gaps filled with a product that is not fire-rated
- Seals cut through by electricians, plumbers or data installers
Should I try it myself first?
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
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 doesn’t work out, we can still put it right.
Fire rated sealant in Colney Heath
Where services or frames pass through a fire-resisting wall or floor, the gap around them needs a fire-rated seal. Each gap is sealed to the product maker’s tested detail for its size and substrate, with a record of the products and locations if you need one. We work on door frames, pipe & cable gaps and linear gaps, and common reasons people get in touch are linear gaps at the head of walls and cracked or shrunken fire-rated sealant.
If you have holiday lets, a converted barn used for business or a community building near Colney Heath, washroom and kitchen sealant and any fire-rated joints need the same attention as anywhere.
You’re covered for a year from the day we finish. If there’s a problem with it, please phone 0345 464 0079 or send us an email.
- Location
- Colney Heath (AL4)
- Region
- Hertfordshire
- Guarantee
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Also near Colney Heath
Other services in Colney Heath
When to call us in Colney Heath
Gaps also open up as buildings move: a seal that cracks or pulls away leaves a path for smoke. Knocks, maintenance and building work damage it further.
These are the problems we’re asked about most:
- Gaps left after a refit or conversion
- Ordinary sealant used where a fire-rated product was needed
- Fire seals that have cracked with movement
- Joints picked up in a fire-stopping survey
Rented homes near Welham Green station change hands often, and any gap left by new services in shared walls should be closed with a fire-rated product.
Questions to ask before booking
- What happens if the job turns out different
- How long to leave it before use
- Whether they seal over old material or remove it
- Which colour the sealant will be
Colney Heath: your questions answered
Do you take on hotel work around Colney Heath?
Yes. Hotel and guest-house work is part of what we do. Jobs can be programmed room by room, with out-of-hours working possible to arrange.
Do you cover smaller places like Colney Heath?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can I do it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs.
Do you remove the old sealant?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
How long will you be here?
That depends on how much there is to do, but as a guide it takes anything from a few hours to several days, depending on how many gaps there are. We will tell you when we quote.
Do I have to be there?
It depends on the job. For work indoors, someone needs to let us in, and for outside work we’ll agree access with you when we book.
Is the work guaranteed?
Yes. There’s a 12-month guarantee on every job, wherever you are.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. Our applicators cover Colney Heath, along with the rest of our area.
Commercial buildings in Colney Heath
Hatfield, which Colney Heath is part of, is one of England’s post-war new towns. Hatfield was planned with its own industrial and business areas, so workplaces sit close to the homes. Their washrooms, kitchens and fire-rated joints need the same upkeep as anywhere. 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.
Community buildings like Church of St Mark are part of the picture too: gaps around pipes and cables are worth checking after any building work there. Managing a site like Colney Heath Junior Mixed Infant and Nursery School? Then fire-stopping around service openings should be restored whenever new services go in.
Colney Heath is about 2 miles south-west of Hatfield, in Hertfordshire. Homes, rented property, offices and hotels in Colney Heath can book us for fire rated sealant, old or new, large or small. Every job comes with our 12-month guarantee. Our area takes in 381 places across Hertfordshire. There’s also a page for London, about 18 miles away.
All of AL4 is covered for fire rated sealant. Local streets include High Street, Fair View and Roestock Lane, and we cover them all. We also cover the places around Colney Heath: Sleapshyde (1 mile north-west), Welham Green (1 mile east), Smallford (1 mile north-west), Hatfield (2 miles north-east) and Tyttenhanger (2 miles west). Larger places within reach include Watford (8 miles south-west), Hemel Hempstead (9 miles west), Stevenage (12 miles north), St Albans (3 miles west), Welwyn Garden City (5 miles north-east) and Harpenden (7 miles north-west).
Local landmarks in Colney Heath
We work in homes and buildings around Chalkdrawers Arms, Bishop's Hatfield Girls' School and North Mimms Park. The nearest railway station is Welham Green station, roughly 1.7 miles east of the centre. A little further out are Hill End Hospital (2.3 miles west) and The Bunker at Hatfield Police Station (1.9 miles north). Green spaces nearby include Verulamium Lake and Colney Heath Local Nature Reserve.
Landlord and commercial work in Colney Heath
For anyone letting property in or around Colney Heath, jobs at different addresses can go on one quote. Send us the addresses and the work at each, and pictures by email help.
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
What affects the quote in Colney Heath
Every job gets its own quote. This is what makes a difference:
- Mould in or behind the old joints
- Which sealant suits the joint
- Working hours on commercial sites
- The number of rooms or windows
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or email us.
What to tell us for a quote
Photos help, but a description is a good start. Try to tell us:
- The rough size of the job
- If someone has resealed it before
- Whether it’s a home or a business
- What’s wrong with the joints now
We quote each job on its own, so the first step is telling us about yours. Simply phone 0345 464 0079 or drop us an email and describe the job.
What happens if it’s left?
Sealant is not the fix for every opening. Large holes, cable bundles and plastic pipes can call for batts, collars or wraps. We will say so if a gap needs something other than sealant. Where a wall is exposed, as many are in small places like Colney Heath, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
Why us?
- Arbo and Everbuild products
- Old sealant always removed completely
- Homes, businesses and hotels
- Approved under the ARBOMaster scheme
Take a look at our cost guide or customer reviews.
What we do, step by step
Good joint work is mostly preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. In total, it generally takes a few hours for a handful of gaps, and longer for a whole building. In a small place like Colney Heath, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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 and the faces cleaned.
- We fit backing where needed and apply the fire-rated sealant to depth.
- We hand over a list of locations and products.
Preparing for the visit
- Let us know if you’ve seen damp or leaks
- Tell us if parking is tricky
- Keep children and pets away from the work area
Ask for a quote
For fire rated sealant in Colney Heath, ring 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before we start.
Related advice
Honest limits
To be straight with you, there are a few things sealant will not fix:
- Sign-off of the building, which sits with building control or your assessor
- Large holes that need a different fire-stopping system
- Walls or floors that weren’t built to resist fire
Not sure which it is? You can phone 0345 464 0079 or email us and we will tell you honestly.
Joints and surfaces we work on
- Service penetrations
- Flats & HMOs
- Door frames
- Pipe & cable gaps
- Linear gaps
- Plasterboard & masonry