The Mastic Doctor team standing beside their branded vans outside an office building
West Berkshire · England

Thatcham fire stopping

Need fire stopping in Thatcham? It’s simple: send details, get a quote, we seal, guaranteed.

  • Penetration schedules that need working through
  • Unsealed openings around new pipes and cables
  • Damaged fire seals in risers and voids
1
Send details
Drawings, photos, a joint schedule or a site visit.
2
Get a quote
A fixed price, with what’s included set out clearly.
3
We seal
Failed joints cut out, faces prepared, new sealant laid.
4
Guaranteed
12-month guarantee on our workmanship.
Covering the South East & Scotland
CHAS & Constructionline
£5m PL insurance

Fire stopping across Thatcham

Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.

Fire stopping for commercial buildings in Thatcham

No fire sealant works on its own: its test evidence covers one product in one kind of wall or floor, with set services, gaps, depths and backing. We match each opening to that detail before any sealant goes in, and we say so if it doesn’t fit. We work on small duct penetrations where the tested detail allows, service gaps in risers and linear gaps at wall heads, and the usual reasons a site gets in touch are penetration schedules that need working through and seals disturbed by maintenance and left open. A single leaking joint is often how a building in Thatcham first comes to us: we look at the rest while we are there and tell you what we find.

In a town such as Thatcham, fire-rated sealing is often needed in schools, surgeries, care homes, offices and flats above shops. New cabling or pipework through a fire-resisting wall leaves a gap that has to be made good with the specified product.

What our 12-month guarantee covers is the way we did the job: preparation, application and finish. Damage, later alterations by others and movement beyond what the joint was designed for sit outside it.

Mastic Doctor team members lined up next to their branded vans outside an office building
Where
Thatcham (RG19, RG18)
Region
West Berkshire
Cover
12 months on our workmanship
Price
A fixed quote before we start
Call
01277 525 020
Last updated
3 November 2026

What happens if it’s left?

An open or wrongly sealed service penetration lets fire and smoke reach the next compartment much sooner than the building was designed for. While the openings can be reached, sealing them is normally straightforward. Left until ceilings are closed or a tenant moves in, the same work costs more access and more disruption. A failed joint is easier to put right before damp shows inside. Once water gets in, there’s drying out and making good as well.

A quote for service penetrations depends on how many there are, their condition and the access. Ask us for a fixed quote.

Why us?

  • One phone line for London, the South East and Scotland
  • Fully insured
  • Fixed quotes based on photos, drawings or a visit
  • Old sealant cut out, never sealed over

See what affects the cost and our accreditations and insurance.

On site: what to expect

Tell us your site hours and access windows and we will plan around them. On the day, the work area is kept contained and tidy, and your contact hears from us before we move to the next area. Town-centre premises in Thatcham may have limited parking, so tell us what’s nearby. On estates and business parks it’s typically simpler.

  1. The specification and schedule come first, so we know which details apply.
  2. Access, permits and the order of areas are agreed with the site team.
  3. We compare every service penetration with its tested detail before sealing.
  4. Unsuitable material is removed and the opening cleaned first.
  5. Backing and fire-rated sealant are installed to the detail and tooled.
  6. Anything outside the detail is reported to you rather than sealed.

Preparing the site

  • Warn occupants and staff about the work
  • Flag any permit to work we will need
  • Tell us which areas need to stay in use

Quotes

A good quote starts with a clear picture: the joints involved, quantities, access and the product called for. Send what you have, and we will arrange a site visit if anything is unclear.

Get a quick quote

Read more

What we can’t put right

Before quoting, we check that sealant is the right answer. It won’t put right:

  • Walls or floors that aren’t fire-resisting to begin with
  • Writing the fire-stopping specification
  • Signing off or certifying a building’s fire stopping

If you are not sure, just give us a call on 01277 525 020 or email drawings and photos and we will give you a straight answer before you book.

Joints and surfaces we work on

  • Pipe penetrations
  • Joints between fire-resisting walls and floors
  • Linear gaps at wall heads
  • Cable penetrations
  • Small duct penetrations where the tested detail allows
  • Service gaps in risers

Keeping the joints sound

Cleaning and maintenance staff play a part too. Share these points with them:

  • Check risers and ceiling voids after each round of works
  • Brief every trade that openings they make must be sealed
  • Get seals inspected before ceilings and boxing close
  • Foam or ordinary sealant is never a fire-seal repair

During planned inspections, look at seals in risers, cupboards and voids. Watch for cracked sealant, new services with no seal and openings that have grown.

Make reporting new openings part of every permit to work in service areas. Small habits like this stop openings building up.

Thatcham: questions and answers

Will you take on work at estates like Pipers Lane Industrial Estate, close to Thatcham?

Yes, sites like Pipers Lane Industrial Estate are within our area, along with the rest of Thatcham. A few photographs and the unit address let us price the work.

Can you seal around new services in a hotel near Thatcham?

Yes, where fire-rated sealant is the specified product. Each seal follows the tested detail, and rooms are done in turn.

Can staff carry on working while you’re here?

Yes, as long as we plan it. Tell us your site hours and access windows and we’ll plan around them.

How long before the joints can be used?

The product and site conditions decide that. Some products skin over quickly but need longer to cure fully, so we will confirm the curing time on the day.

Are your applicators CSCS-carded?

Yes. We use CSCS-carded applicators, as many construction sites ask for.

Is it fine to apply new sealant on top of old?

No. We cut the old material out and clean the joint back before sealing, because fresh silicone will not bond with aged silicone.

How long will the new sealant last?

There’s no fixed lifespan: movement, exposure, cleaning, traffic and the product all play a part. Sealant joints are maintenance items, so inspect them regularly.

How the job changes by surface

Linear joints

Head-of-wall gaps, slab edges and wall junctions are linear joints. Their tested detail, under BS EN 1366-4, sets the width, depth, backing and movement allowed.

Risers and ceiling voids

Voids hide a lot of unsealed openings. We follow your schedule area by area.

General trades versus a specialist

Paperwork matters too. Many sites expect CSCS cards, RAMS and proof of insurance, and our CSCS-carded applicators are used to working under those rules.

For most general trades, sealant is a sideline. A specialist brings correct preparation, depth control with backing rod and a product suited to that particular joint, which is what makes a joint last.

Fire stopping around Thatcham: how the place shapes the job

A 2-mile radius around Thatcham takes in several hotels. A hotel refit often runs new services through compartment walls between bedrooms and corridors, and each opening needs the specified seal. At about 51 miles from central London, Thatcham is within reach of the capital. Business park offices in the commuter belt are refitted as tenants change, and each fit-out adds services through compartment walls.

In a retail centre such as 9Yards Retail Park, which lies west of Thatcham, any fire-resisting wall between units that is crossed by new services needs sealing to the tested detail. Halls and meeting rooms at places like United Reformed Church sometimes gain new services, and any compartment wall crossed needs the specified seal. Industrial units on estates such as Pipers Lane Industrial Estate (to the south-east of Thatcham) often separate offices from warehouse space with fire-resisting walls, and new services through them need the specified seal.

Thatcham is about 12 miles north-west of Basingstoke, in West Berkshire. Looking for fire stopping in Thatcham? We can help. We work across 140 places in West Berkshire. Reading is covered too, around 13 miles from Thatcham.

Postcode districts covered here: RG19 and RG18. Among the streets we cover are High Street, Station Road and Flagstaff Square, and sites on any of them can send details for a fixed quote. With the A4 nearby, Thatcham is easy to get to with materials and equipment. Close to Thatcham, our area also takes in Benham Hill (1 mile west), Ashmore Green (2 miles north-west), Cold Ash (2 miles north), Upper Bucklebury (2 miles north-east) and Stone Copse (2 miles north-west). Bigger towns within reach include Newbury (3 miles west), Burghfield Common (8 miles east), Speenhamland (3 miles west), Hungerford (11 miles west), Fords Farm (10 miles east) and Little Heath (10 miles north-east). As one of the bigger centres in West Berkshire, Thatcham has a broad mix of commercial, public and industrial buildings, and we cover them all.

Near you in Thatcham

We work on buildings around Kennet School and The Old Chequers Public House, among other places. Thatcham’s nearest station is Thatcham station, roughly 0.9 miles south-east. Nearby you will also find Old Chapel Textile Centre (2.2 miles south-west) and West Berkshire Community Hospital (1.5 miles west). For a walk, there’s Nature Discovery Centre.

Map of Thatcham © OpenStreetMap contributors
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