Hertfordshire · England

Fire Rated Sealant in Great Amwell

Fire rated sealant in Great Amwell from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.

  • Open gaps behind door architraves
  • Fire stopping disturbed by later work
  • Gaps where walls meet ceilings or slabs

Fire rated sealant near Great Amwell

About our fire rated sealant in Great Amwell

We don’t assess buildings or decide what fire stopping is needed; that comes from your fire risk assessor, designer or building control. Our part is applying the specified sealant carefully, to the right depth and with the right backing. We are often asked to deal with gaps filled with a product that isn’t fire-rated and open holes round services passing through fire walls, across pipe & cable gaps, linear gaps and flats & HMOs.

Somewhere as small as Great Amwell, commercial jobs tend to be pubs, holiday lets, farm buildings or halls rather than offices. They all have washrooms, kitchens and service openings that need the right sealant.

The work is covered for a year after we finish. If anything isn’t right with it, call 0345 464 0079 or send us an email.

Place
Great Amwell (SG12)
Wider area
Hertfordshire
Cover
A year, on every job
Quote
A clear quote up front
Call
0345 464 0079
Updated
26 October 2026
Eleven members of the Mr Mastic team standing in front of branded white vans

When something else is needed

A few problems are outside what sealant work can do:

  • Problems with the door itself rather than the gap around the frame
  • Sign-off of the building, which sits with building control or your assessor
  • Big openings where sealant alone isn’t the tested solution

If in doubt, call 0345 464 0079 or drop us an email and we will say what we think before booking.

Joints and surfaces we work on

  • Plasterboard & masonry
  • Pipe & cable gaps
  • Service penetrations
  • Flats & HMOs
  • Door frames
  • Linear gaps

Fire rated sealant in Great Amwell: 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, which is often where open fire-stopping gaps are first noticed. We work to the specification you’re given, installing the product to its tested details.

Letting a property close to St Margarets (Herts) station? Then new cables or pipes through a fire-resisting wall leave a gap that needs the right sealant. Community buildings like Parish Church of St John the Baptist are part of the picture too: gaps around pipes and cables are worth checking after any building work there.

Great Amwell is about 1 mile south-east of Ware, in Hertfordshire. Great Amwell gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Great Amwell is one of 381 towns and villages in Hertfordshire we cover. There’s also a page for London, about 21 miles away.

We work across SG12 for fire rated sealant. Fire rated sealant is available to properties on Church Path, Amwell Hill and Madgeways Lane and the roads around them. Other places close to Great Amwell include St Margarets (1 mile south-east), Hailey (1 mile south), Little Amwell (1 mile south-west), Rush Green (1 mile west) and Stanstead Abbotts (1 mile south-east). Within a short drive, we also cover Stevenage (11 miles north-west), St Albans (14 miles west), Bishop's Stortford (9 miles north-east), Welwyn Garden City (8 miles west), Harpenden (14 miles west) and Hitchin (15 miles north-west).

Around Great Amwell

We work in homes and buildings around Hertford Regional College and Jolly Fisherman Public House and the streets around them. The closest station to Great Amwell is St Margarets (Herts) station, roughly 0.9 miles south-east. Other landmarks nearby include Museum of Street Lighting (within half a mile north) and Barrowfield (1.4 miles west). Open spaces near Great Amwell include Amwell Quarry.

Map of Great Amwell © OpenStreetMap contributors

Questions from Great Amwell

Will you come out to Great Amwell?

Yes, Great Amwell is covered. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.

Can you help a landlord with a rental near St Margarets (Herts) station?

Yes. We work for landlords and agents as well as householders, and several properties can be quoted together. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we will send you a clear quote.

Will there be a smell?

It depends on the product. Some products have a noticeable smell, others very little, and any smell fades as they cure.

Should I try DIY first?

Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.

Can ordinary silicone be used in a fire-stopping gap?

No. Where a fire-rated seal is needed, it has to be a product tested for that use.

Does someone need to be in?

If the work is inside, we need someone to let us in. After that, you can carry on with your day.

Can you match the sealant colour?

We help you choose a colour that suits, from white and clear to greys and other shades. The product needed can limit the range.

Do you certify the fire stopping?

We do not issue ratings or certificates ourselves. The performance comes from the product’s tested details and the specification from your assessor or designer; we install to those details and record what we did.

Surface by surface

Masonry and concrete

Core-drilled and broken-out holes in concrete are often irregular. We measure the gap at its widest point against the product’s tested range.

Plasterboard walls

We check that the board around the gap is sound. Crumbling edges are cleaned back before the sealant goes in.

DIY sealant or a professional job?

What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.

Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.

What we do, step by step

The work is kept neat and contained to the area we are working on. Expect the work to take from a few hours to a few days, depending on the number of gaps and the access. For a village or hamlet like Great Amwell, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.

  1. We start with the survey or action list, checking the size and surfaces of every gap.
  2. Old or unsuitable sealant is cut out and the gap cleaned.
  3. Backing or fill is fitted where the product’s tested detail calls for it.
  4. The sealant goes in to the depth its detail sets, then it’s tooled off.
  5. Finally, we list where we worked and what we used, for your records.

Before we arrive

  • Tell us about any previous sealing or DIY attempts
  • Tell us if parking is tricky
  • Try not to wet indoor joints just before the visit

Get a quote

There’s no standard price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or send us an email.

Get a quick quote

Related advice

Keeping the joints in good condition

A little care helps the new joints last. Our advice:

  • Never patch a fire seal with standard sealant
  • Tell trades working in the building that fire seals must be put back
  • Ask which product was used before you paint
  • Keep the record of products and locations with your fire safety documents

Keep the record we give you with the building’s fire safety documents. It saves time at the next inspection or assessment.

It’s easiest to seal gaps while they’re few and easy to reach. Over time, more work adds more holes and the job gets bigger.

Work for landlords, hotels and businesses

Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.

A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.

Signs you need fire rated sealant in Great Amwell

If the sealant is too shallow, has the wrong backing or sits on a dusty surface, it isn’t installed as tested. We see plenty of fire stopping that was hurried, especially where it was squeezed in at the end of a project.

Look out for any of the following:

  • Sealant items on a fire risk assessment action list
  • Seals cut through by electricians, plumbers or data installers
  • Unsealed gaps around fire door frames
  • Standard silicone or caulk in a fire-stopping gap

For site and facilities teams at buildings such as Presdales School, gaps opened by contractors for new cabling are a common finding in schools and offices.

Questions to ask before you book

  • What the cure time is
  • Whether VAT is included
  • How hidden problems are handled
  • Is the old sealant removed completely?

Our hiring checklist

20+ yearsMastic and sealant specialists
ARBOMaster approvedApproved applicator for Arbo sealants
Fully insuredDomestic, commercial and hotels
One-year guaranteeOn every job