The Mastic Doctor team standing beside their branded vans outside an office building
Windsor and Maidenhead · England

Fire-rated sealing and fire stopping in Frogmill, Windsor and Maidenhead

Planning work on a service penetration in Frogmill? We assess it, carry out the work and guarantee our workmanship for 12 months.

  • Service penetrations left open after M&E works
  • Fire-stopping items raised at inspection or handover
  • Fire stopping installed outside its tested range
1
Send details
Tell us about the site, with photos if you have them.
2
Get a quote
A fixed price, with what’s included set out clearly.
3
We seal
The right sealant, to the right depth, neatly finished.
4
Guaranteed
Our workmanship is guaranteed for 12 months.
South East, London & Scotland
CHAS accredited
£5m PL insurance

Fire stopping across Frogmill

Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.

Diagnose, treat, sign off

We begin with a short walk round with whoever looks after the building, to confirm the scope, the order of work and any areas we must keep clear. After that, any old or failed material is removed, each joint is prepared and the new sealant goes in. Smaller jobs around Frogmill can be grouped with others nearby, which keeps travel down. A fixed quote is given before anything starts.

  1. We read the specification, drawings or penetration schedule you send and raise any questions before we price.
  2. Every penetration is compared with its detail: wall or floor type, service, gap size and depth.
  3. Anything that doesn’t belong in the opening, such as expanding foam or general-purpose filler, is removed.
  4. We fit the backing the detail asks for, to the stated depth.
  5. We apply the specified sealant to the depth and around the services as the detail shows.
  6. If an opening needs something other than sealant, we tell you instead of improvising.

Preparing the site

  • Send asbestos survey details if the building is pre-2000
  • Point out parking and an unloading spot
  • Agree which areas must stay open

Request a quote

Tell us about the building, the joints and when you need the work done, and a fixed quote will follow. To get it moving, ring 01277 525 020 or email the details over.

Ask for a quote

Read more

About our fire stopping in Frogmill

We should be clear about what we do and don’t do. The designer, fire engineer or building control decides which fire stopping is required; sign-off sits with them too. What we bring is careful installation of the specified sealant, to the maker’s guidance. If you have builders’ foam or ordinary silicone in compartment walls and unsealed joints where partitions meet the slab, we can help, whatever the surface. Whether you call it commercial sealant work, mastic application or joint sealing, in Frogmill it comes down to the same thing: the right product in a properly prepared joint.

Smaller places such as Frogmill still have buildings with fire-resisting walls and floors: schools, halls, care homes and commercial conversions. If sealant is what the specification names, we install it around the services exactly as the maker’s detail sets out.

Every job ends the same way: guaranteed. You get a 12-month guarantee on our workmanship, and the quote explains what it covers.

Mastic Doctor team members lined up next to their branded vans outside an office building
Location
Frogmill (SL6)
Region
Windsor and Maidenhead
Guarantee
12 months on every job
Quotes
Fixed quote, scope in writing
Phone
01277 525 020
Last updated
3 November 2026

What affects the price in Frogmill

Before we quote, we look at:

  • Whether old sealant has to be cut out first
  • Working within restricted access windows
  • Quantities, in metres or numbers
  • Backing rod, priming and other preparation

A quote for service penetrations depends on quantities, condition and access. Call for a quote.

What to include in your enquiry

Diagnosis starts before we arrive. Let us know:

  • What the building is and how it’s used
  • How the joints are reached, and at what height
  • Whether an asbestos survey exists
  • Clear photographs of the problem areas

Specifications, drawings and tender packages are welcome with any enquiry, and we will price against exactly what is specified. For smaller jobs, photographs and a description will do.

Fire stopping in Frogmill: the local picture

Fire stopping of openings and penetrations in England falls under Approved Document B. The national BS 476 classes are due to drop out of it from 2 September 2029, leaving the European BS EN 13501-2 route, subject to transitional arrangements. We install whatever has been specified, to the product’s tested detail. At about 32 miles from central London, Frogmill is within reach of the capital. Office refits around the commuter belt bring new cabling through fire-resisting walls; the gaps need the specified seal.

Offices at parks like Rashleighs Business Centre (2.8 miles east of Frogmill) are re-cabled with each new tenant, and compartment walls need sealing afterwards to the tested detail. Colleges such as Berkshire College of Agriculture, 1.6 miles south-east of Frogmill, add IT and services as courses change, and each new penetration through a fire-resisting wall needs sealing with the specified product.

Frogmill is about 3 miles south-west of Marlow, in Windsor and Maidenhead. Anywhere in SL6, it works the same way: details in, fixed quote out, then sealing and a 12-month guarantee. Frogmill is one of 60 places in Windsor and Maidenhead on our list for service penetrations. There’s a separate page for Reading, roughly 9 miles from Frogmill.

Business premises anywhere in SL6 are within our area for service penetrations. Sites close to Frogmill are covered too, including Medmenham (1 mile north-west), Hurley (1 mile east), Danesfield (1 mile north), Bockmer End (1 mile north) and Cockpole Green (2 miles south-west). Bigger towns within reach include Maidenhead (4 miles east), Windsor (10 miles south-east), Boyn Hill (5 miles south-east), Cookham (4 miles east), Furze Platt (4 miles east) and Dedworth (9 miles south-east).

What’s near Frogmill

In Frogmill, that means premises near Black Boys Inn, among other places. Frogmill’s nearest station is Henley-On-Thames station, about 3.1 miles west. Other landmarks nearby include Marlow Community Hospital (3.2 miles north-east) and Marlow Museum (2.7 miles north-east). For a walk, there’s Hurley Chalk Pit and Weycock Hill.

Map of Frogmill © OpenStreetMap contributors

Looking after the joints

For the best life from the joints:

  • Settle who seals which penetrations at the start of a project
  • Look above ceilings when tiles are lifted for other jobs
  • Record which product was used where
  • Put resealing into every M&E and fit-out package

Store the specified product details somewhere the next contractor can find them. It makes later repairs much easier to match.

Write fire stopping into the scope of any work crossing a compartment wall or floor. That way the opening is sealed while the trade and access are still there.

Do you need fire stopping in Frogmill?

Some seals fail because the wrong product went in: builders’ foam or ordinary silicone used to fill a hole. It may look closed, but it has no tested fire performance in that position, so it has to come out.

Things that normally lead to an enquiry:

  • Open linear gaps along the top of fire-resisting walls
  • Penetration schedules that need working through
  • Openings found when ceilings come down for a refit
  • Openings left by services added after handover

For a hotel such as Danesfield House Hotel and Spa, 0.6 miles north of Frogmill, penetration seals are worth checking after any refit or services upgrade.

What to look for in a quote

  • The terms of the workmanship guarantee
  • How the existing material will be dealt with
  • How the joint faces will be prepared and primed
  • Proof of insurance

How to choose a sealant contractor

Why deal with it now?

Inspections and handover checks often pick up fire stopping. Late discoveries can delay handover while openings are reopened and resealed which is why earlier is better. Older rural buildings around Frogmill move with the seasons, and rigid or tired sealant can’t keep up. The right product, sized to the joint, copes much better.

Small jobs and large programmes are priced from the same things: scope, access, product and programme. Call for a quote, and you’ll have a fixed figure to work with.

Why appoint us

  • A Constructionline member, so easy to vet
  • 12-month guarantee on workmanship
  • One phone line for London, the South East and Scotland
  • CHAS accredited contractor

Read what affects the cost and how we’re accredited.

How the job changes by surface

Cables and cable bundles

Data cabling added after handover is a regular cause of open service penetrations. We reseal around them to the specified detail, and any bundle too large for sealant alone is flagged.

Small ducts

Ducts are only sealed with sealant where the detail allows it. Dampers and ductwork systems themselves are outside our work.

Frogmill: questions and answers

Do you take on work at healthcare sites like Marlow Community Hospital?

Yes, healthcare and care buildings are part of our work. Before anything starts, the estates team agrees permits, inductions and infection-control measures with us.

Can you work around term dates at a campus such as Berkshire College of Agriculture?

Yes. Tell us the term dates, vacation periods and access windows, and we will plan the work around them. Any paperwork you need, from RAMS to our insurance certificate and CSCS details, is confirmed with the quote.

Is BS 476 being phased out?

From 2 September 2029, Approved Document B in England drops its references to BS 476 classes, subject to the Government’s transitional arrangements. The European route, BS EN 13501-2, then applies. Your designer will choose products with the right evidence.

How long do sealant joints last?

It depends on movement, UV and weather, cleaning, traffic and the product. Treat them as maintenance items and inspect them regularly.

Can you reseal penetrations after our M&E works?

Yes. Share the penetration schedule and product details for a fixed quote. We can follow the services contractor floor by floor keeping pace with the programme.

Who decides which product is used?

Where there’s a specification, we use the product it names. Otherwise, we recommend a product to suit the joint’s movement, the substrate and the conditions, following the manufacturer’s guidance.

Will you sign off the seals for us?

No. Sign-off isn’t ours to give, and we don’t hold a third-party installer certificate. Our part is fitting the specified product to its tested detail.

Accreditations

Trusted. Accredited. Insured.