Hertfordshire · England
Fire Rated Sealant in Great Gaddesden
Intumescent and fire-rated sealant around gaps, frames and service penetrations in Great Gaddesden, with a 12-month guarantee on every job. Ask us for a quote.
- Gaps left after a refit or conversion
- Unsealed gaps around fire door frames
- Fire seals that have cracked with movement
What affects the cost of fire rated sealant
Call for a quick quote. The main things that affect it are:
- Access and height
- The size of the job
- The type of sealant required
- Mould in or behind the old joints
The cost depends on how much there is to do, how much old material has to come out and access to the work. You will have a clear quote before any work starts.
Helping us quote
Photos help, but a description is a good start. Try to tell us:
- Pictures of the joints, sent by email
- Access, such as stairs, a lift or height
- Where the property is
- The rough size of the job
It all starts with a short chat. Describe the problem, the location and the size of the job. When it suits you, ring 0345 464 0079 or drop us an email.
About our fire rated sealant in Great Gaddesden
Filling a fire-stopping gap with standard silicone or caulk does not make it fire-rated. Anything unsuitable comes out first and reseal with a fire-rated product tested for that kind of gap. We work on service penetrations, plasterboard & masonry and door frames, and the jobs we see most are ordinary sealant used where a fire-rated product was needed and fire stopping disturbed by later work.
Work in a small place like Great Gaddesden is planned ahead, journey included, so the job can fit around bookings, guests or opening times where possible.
You get a one-year guarantee, the same in Great Gaddesden as everywhere else we work.
- Place
- Great Gaddesden (HP1)
- Wider area
- Hertfordshire
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
FAQs for Great Gaddesden
Is Great Gaddesden within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can you help a landlord with a rental near Berkhamsted station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before we start.
Where do you work from?
Mr Mastic is based in Crawley. Our applicators cover Great Gaddesden.
Do I have to be there?
We need access to the joints, so we will agree that with you when we book. For inside work, that normally means someone being in.
What does intumescent mean?
An intumescent sealant expands when it gets hot, helping close the gap. It’s one type of fire-rated sealant; which product suits depends on the gap, the substrate and the service.
Can new sealant go over the old?
No. Fresh sealant doesn’t stick to old sealant, and it traps any mould or water underneath. We remove it all first.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We explain the product when we quote.
Will you assess my building’s fire safety?
No, we do not assess buildings. When your assessor or designer has set out what’s needed, we can quote for the fire-rated sealant items.
Landlord and commercial work in Great Gaddesden
We work for landlords and agents as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
How the job changes by surface
Plasterboard walls
Many fire-resisting walls in flats, offices and conversions are plasterboard. We use a product tested in that kind of wall for the gap we are sealing.
Linear gaps
Linear gaps run along the head of walls, at floor edges and between panels. We seal them to the tested detail, with backing where it’s needed.
Fire rated sealant around Great Gaddesden
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.
Community buildings like Church of St John the Baptist are part of the picture too: service openings in its walls need the right fire-rated sealant, as in any building. If you let a flat or house near Berkhamsted station, new cables or pipes through a fire-resisting wall leave a gap that needs the right sealant. Managing a site like Great Gaddesden Church of England Primary School? Then gaps opened by contractors for new cabling are a common finding in schools and offices.
Great Gaddesden is about 3 miles north-west of Hemel Hempstead, in Hertfordshire. Whether you are in the middle of Great Gaddesden or further out, fire rated sealant is available for homes and businesses alike. Our area takes in 381 places across Hertfordshire, large and small. For nearby work, see our London page.
Jobs for fire rated sealant in HP1 is quoted and booked the same way as anywhere else. Whether your property is on Church Meadow, Piper's Hill and Dagnall Road or anywhere close by, we can help. Other places close to Great Gaddesden include Nettleden (1 mile south-west), Frithsden (1 mile south-west), Potten End (2 miles south-west), Fields End (2 miles south) and Ashridge (2 miles west). Further out, we also cover Watford (10 miles south-east), Hemel Hempstead (3 miles south-east), St Albans (8 miles east), Welwyn Garden City (14 miles east), Harpenden (7 miles east) and Hitchin (15 miles north-east).
What’s near Great Gaddesden
Locally, jobs take us to homes and businesses close to John F Kennedy Catholic School and The Crown and Sceptre pub and the streets around them. For rail, the closest station is Berkhamsted station, about 3 miles south-west of the centre. Well-known places in the area include Hemel Hempstead Hospital (3.2 miles south-east). Green spaces nearby include Landpark Wood.
Places near Great Gaddesden
Other services in Great Gaddesden
Leave it or put it right?
Leaving a gap until a refurbishment comes round can mean years with it open. Sealing the gap now is a contained job on its own and needn’t wait for anything else. Around Great Gaddesden, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Why us?
- An ARBOMaster approved applicator
- Anti-fungal silicone where joints get wet
- Old sealant always removed completely
- Domestic, commercial and hotel work
Read what affects the cost and our reviews.
What happens on the day
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The job generally takes anything from a few hours to several days, depending on how many gaps there are from start to finish. Somewhere as small as Great Gaddesden, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- Access to each area is agreed so the work can run in order.
- Old, damaged or unsuitable sealant is removed.
- Dust and loose debris are cleaned from each gap.
- We apply and tool the sealant to the product’s tested detail.
- Locations and products are written up and any gaps unsuitable for sealant are flagged.
How to prepare
- Mention any parking rules near the property
- Tell us about access, such as stairs, a lift or high-level joints
- On commercial sites, let us know about site rules
How to get a quote
To get a quote, ring 0345 464 0079 or email us with the location and a short description of the problem. We will send you a clear quote before any work starts.
Related advice
When it is not the sealant
We will always be straight with you, so here’s what sealant can’t fix:
- Sign-off of the building, which sits with building control or your assessor
- Construction that doesn’t provide fire resistance on its own
- Fire doors that need new seals, closers or hardware
If you’re not sure, just phone 0345 464 0079 or email us and we will give you a straight answer.
What we seal
- Linear gaps
- Door frames
- Pipe & cable gaps
- Plasterboard & masonry
- Service penetrations
- Flats & HMOs
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. A few tips:
- Plan fire stopping into any work that goes through walls or floors
- Check whether a sealant can be painted before decorating over it
- Check risers, ceiling voids and cupboards during building checks
- Don’t fill fire-stopping gaps with ordinary foam or silicone
Any fire seal that is cut or drilled needs resealing to its tested detail. New services through a sealed wall should include fire stopping in the plan.
It’s easiest to seal gaps while they’re few and easy to reach. Leave them and each new job adds another hole.