Hampshire · England
Fire Rated Sealant in Longstock
Problem with your fire-stopping gaps in Longstock? We cut out the old, prepare the joints and apply the right sealant.
- Open gaps behind door architraves
- Sealant items on a fire risk assessment action list
- Cracked or shrunken fire-rated sealant
What the job involves on each surface
Plasterboard walls
Service holes in plasterboard are often rough and oversized. Where a hole is bigger than the sealant’s tested range, it needs another approach, and we’ll tell you.
Door frames
Behind most architraves is a gap between frame and wall. Where it’s open, we seal it to the product’s details for that gap size so the architrave can be refitted.
Fire rated sealant in Longstock, done properly
We often work from an action list drawn up by a fire risk assessor for buildings in Longstock. If you share the list, we can quote for the gaps that need fire-rated sealant. We work on service penetrations, plasterboard & masonry and door frames, and people most often call us about door frames with gaps between frame and wall and fire seals that have cracked with movement.
In a village or hamlet like Longstock, commercial work is more likely to be a pub, a farm shop, holiday lets or a village hall than an office block. Each still needs sound sealant in its washrooms and kitchens, and fire-rated joints where services pass through walls.
Big or small, you get the same 12-month guarantee.
- Place
- Longstock (SO20)
- Region
- Hampshire
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
How the visit works
A visit follows a simple pattern: we look at the joints together, protect the area around them, carry out the job and tidy away. It normally takes anything from a few hours to several days, depending on how many gaps there are. Somewhere like Longstock needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- Access to each area is agreed so the work can run in order.
- We take out any damaged or unsuitable sealant.
- Gaps are cleaned of dust and loose material.
- The fire-rated or intumescent sealant is applied and tooled to the tested detail.
- We record what was done and flag anything that needs a different system.
How to prepare
- On commercial sites, let us know about site rules
- Keep children and pets away from the work area
- Tell us about access, such as stairs, a lift or high-level joints
Getting a quote
For fire rated sealant in Longstock, phone 0345 464 0079 or email us. Tell us what the problem is and where, and you will get a clear quote before any work starts.
Related advice
Questions from Longstock
Is Longstock within the area you cover?
Yes. Longstock is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Can you do fire rated sealant in Longstock?
Yes, Longstock is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job.
Can I add another job to the visit?
Of course. Doing several areas at once is normally more efficient.
Do you certify the fire stopping?
Ratings and certificates are not something we issue. What’s required is set by your assessor or designer, and the product’s tested details show what it achieves; we install to those details and record what we did.
Will it make a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Where is Mr Mastic based?
Our base is Crawley. We work across South East England, London and Scotland.
How long does fire rated sealant take?
As a guide, most jobs take anything from a few hours to several days, depending on how many gaps there are. Bigger jobs take longer, and we will tell you how long to expect.
Do you offer different sealant colours?
We help you choose a colour that suits, from white and clear to greys and other shades. The product needed can limit the range.
When it isn’t the sealant
New sealant can’t fix everything, and we will tell you before we start. It will not solve:
- Construction that doesn’t provide fire resistance on its own
- Certifying a building or signing off its fire safety
- Problems with the door itself rather than the gap around the frame
If in doubt, call 0345 464 0079 or drop us an email and we’ll say what we think.
What we seal
- Service penetrations
- Pipe & cable gaps
- Linear gaps
- Plasterboard & masonry
- Flats & HMOs
- Door frames
Why it’s worth doing now in Longstock
Waiting for the next refit can leave a gap open for years. On its own, sealing it now is a small job. Around Longstock, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
What you get with us
- Tidy, careful work
- 180+ five-star Google reviews
- Over 20 years’ experience
- Anti-fungal sanitary silicone in wet areas
Take a look at our cost guide or customer reviews.
Keeping the joints in good condition
Aftercare is simple:
- Make resealing part of every contractor’s brief
- Do not paint over fire sealant until it has cured
- Keep pictures of seals that will be hidden
- Don’t fill fire-stopping gaps with ordinary foam or silicone
Follow the cure time we give you before decorating over the sealant. Not every fire-rated sealant takes paint and we will tell you which one you have.
Small gaps around services are simple to deal with while there are only a few. Leave them and each new job adds another hole.
Should I try it myself first?
Not every job suits DIY: 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’re set on DIY, put the effort into 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.
Places near Longstock
What else we do in Longstock
When to call us in Longstock
Door frames are a common weak spot. The architrave hides the gap between frame and wall, so it’s easy to leave unsealed when doors are changed.
Any of these means the joints need attention:
- Damaged fire sealant left by other trades
- Fire seals that have cracked with movement
- Unsealed gaps where pipes and cables go through a wall
- Gaps where walls meet ceilings or slabs
Community buildings like Church of St Mary are part of the picture too: older buildings that have had new heating or wiring often have service gaps worth checking.
Questions to ask before booking
- Who does the work, and how experienced they are
- Whether they’re fully insured
- Whether the sealant suits the joint
- What the quote includes, VAT included or not
Workplaces and buildings in Longstock
Longstock has hotels and guest accommodation in and around it. Hotel work can be planned room by room, with out-of-hours working where needed. Workplaces and the common parts of blocks of flats in England need a fire risk assessment under the Regulatory Reform (Fire Safety) Order 2005, which is often where open fire-stopping gaps are first noticed. We work to the specification you are given, installing the product to its tested details.
Managing a site like Test Valley School? Then fire-stopping around service openings should be restored whenever new services go in.
Longstock is about 5 miles south of Andover, in Hampshire. Every kind of property in Longstock can book us for fire rated sealant, old or new, large or small. The work is guaranteed for a year. 683 places in Hampshire are on our list. We also work in Southampton, about 15 miles from Longstock.
Our applicators cover all of the SO20 postcode area for fire rated sealant and the streets around it. Nearby, we also carry out fire rated sealant in Leckford (1 mile east), Stockbridge (1 mile south), Fullerton (2 miles north-east), Cottonworth (2 miles north-east) and Chilbolton (3 miles north-east). Further out, we also cover Winchester (9 miles south-east), Eastleigh (13 miles south-east), Andover (5 miles north), Totton (15 miles south), Chandler's Ford (11 miles south-east) and Romsey (10 miles south).
Around Longstock
Around Longstock, our work takes us to homes and buildings near Longstock Park and The Peat Spade Public House and the streets around them. A little further out are Andover War Memorial Hospital (5.8 miles north). The countryside around Longstock includes Mill Lake.