Fire stopping in Mortimer
Fire stopping for Mortimer, from a contractor working since 2005. Fully insured, with a 12-month guarantee.
- Openings left by services added after handover
- Old intumescent sealant that has split away
- Builders’ foam or ordinary silicone in compartment walls
Fire stopping across Mortimer
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
Fire stopping for commercial buildings in Mortimer
The test standards are BS EN 1366-3 for penetration seals and BS EN 1366-4 for linear joints, with results classified under BS EN 13501-2. That classification, such as EI 60 or EI 120, belongs to the product in its tested arrangement. So our job is to reproduce that arrangement faithfully. We work on service gaps in risers, joints between fire-resisting walls and floors and cable penetrations, and the failures we’re asked to look at most are penetration schedules that need working through and head-of-wall gaps with no fire seal. Sealant applicators who only do sealant are a different proposition from a general trade with a gun in the van: on jobs in Mortimer, preparation and product choice get the time they need.
Fire-rated sealing in a place like Mortimer is usually a single building at a time. Send the specification, drawings or photographs of the openings and we’ll quote to suit.
The 12-month guarantee is for workmanship rather than wear and tear. Sealant wears with time, and movement, weather, cleaning and use decide how fast, so we’re clear about what is covered before work starts.
- Place
- Mortimer (RG7)
- Wider area
- West Berkshire
- Guarantee
- 12 months on every job
- Price
- Fixed quote, scope in writing
- Call
- 01277 525 020
- Page updated
- 3 November 2026
Leave it or put it right?
An unsealed opening affects more than fire safety: they also carry noise, draughts and smells between rooms. The specified fire seal closes the gap for all of these, and the other benefits follow. Over time, UV, weather and movement wear any sealant out. Replacing it before it fails keeps water out.
The price depends on the quantity of joints, what has to come out first and the access. Call for a fixed quote when you are ready.
Why clients in Mortimer choose us
- One phone line for London, the South East and Scotland
- Products installed to the manufacturer’s instructions
- Over 20 years of commercial sealing
- Fully insured
Take a look at our cost guide and how we’re accredited.
For managing agents and facilities managers
If you look after buildings for someone else, you need clear quotes and clear reporting. We quote a fixed sum, confirm the scope and walk the finished work with you or your representative.
Whether you are a managing agent, a property factor or an owner’s representative: send details, get a fixed quote, we seal, guaranteed. Keys, access and contacts can be agreed in advance.
General trades versus a specialist
Certain joints really need a specialist: fire-rated seals that must follow a tested detail, trafficked floor joints and external movement joints among them. A poor seal in places like these tends to cost more to put right later.
A short, simple internal joint is often within reach of a maintenance team. The usual problems come from preparation: sealing over old material, sealing onto damp or dusty surfaces, or a product that can’t take the movement.
Also near Mortimer
More services for Mortimer
Fire stopping in Mortimer: the local picture
In England, Approved Document B covers fire stopping of openings and penetrations. 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 43 miles from central London, Mortimer is within reach of the capital. Tenant changes on commuter-belt business parks mean regular fit-outs, and new services through compartment walls.
In a school such as Mortimer St John's C.E. Infant School, fire-rated sealant goes in around service penetrations where it is specified. Industrial units on estates such as Stacey Industrial Park, 2.9 miles to the south-west of Mortimer, often separate offices from warehouse space with fire-resisting walls, and new services through them need the specified seal.
Mortimer is about 4 miles north-east of Tadley, in West Berkshire. Businesses, contractors and managing agents in Mortimer can call on us for service penetrations. We work across 140 places in West Berkshire. Our Reading page has more on work in that area.
Postcode districts covered here: RG7 for service penetrations. If your site is on The Street, Croft Road and Leigh Field or close by, send details and we’ll quote for service penetrations. Close to Mortimer, our area also takes in Stratfield Mortimer (1 mile east), Mortimer West End (1 mile south-west), Goddard's Green (2 miles north-east), Burghfield Common (2 miles north) and Wokefield (2 miles north-east). A short drive away, we cover Newbury (11 miles west), Thatcham (8 miles west), Speenhamland (11 miles west), Fords Farm (5 miles north), Little Heath (6 miles north) and Calcot (5 miles north).
Landmarks near Mortimer
In Mortimer, that means premises near The Willink School, The Willink School and Padworth Common Local Nature Reserve, among other places. For rail, the closest station is Mortimer station, roughly 1.4 miles east of the centre. Well-known places in the area include Calleva Museum (2 miles south-west) and Beaumys Castle (3.7 miles east). The countryside around Mortimer includes Hosehill Lake.
Diagnose, treat, sign off
The first thing on site is a walk round with your contact, 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. Work in places the size of Mortimer is planned as a single visit where we can. Photos with rough sizes let us arrive with everything needed.
- First we confirm the product and tested details named in the specification.
- We sort the openings by the detail each one needs.
- Improvised fillers and failed sealant are removed.
- Where the detail needs backing, it goes in at the stated depth.
- Fire-rated or intumescent sealant goes in around the services and is tooled off.
- We walk the completed areas with you and confirm the records agreed at quote stage.
Preparing the site
- Send asbestos survey details if the building is pre-2000
- Share your working hours and any access restrictions
- Have the specification and drawings to hand
Ask for a quote
For a fixed quote, speak to us on 01277 525 020 or email us. You can also send details through our quote form.
Read more
Surface 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, and we work within it.
Cables and cable bundles
New data and power cables are the most common breach we see. We reseal around them to the specified detail.
Common questions from Mortimer clients
Will you take on work at estates like Stacey Industrial Park, close to Mortimer?
Yes, sites like Stacey Industrial Park are within our area, along with the rest of Mortimer. Photos and a short description are enough for a first look.
Is Mortimer too small for you to travel to?
Not at all. Mortimer is within our area. London and every South East county are within our area. Where we can, we group nearby jobs to make the most of each trip.
Do you offer coloured sealant?
That depends on the product. Some ranges offer many colours, others very few, so we’ll confirm the colours available for the specified product with the quote.
Are you insured?
Yes. Mastic Doctor is fully insured, public liability included.
Do you take on small jobs?
Small jobs are welcome alongside larger packages. Send details for a fixed quote.
Does the weather affect the work?
For external joints, yes. The joint has to be dry and within the product’s temperature range, so damp, frosty or very cold days can stop external work. Inside work is seldom held up.
Is BS 476 being phased out?
For buildings in England, Approved Document B removes BS 476 references from 2 September 2029. Products are then judged on BS EN 13501-2 classifications, subject to transitional arrangements. In Scotland, the Technical Handbook sets its own guidance, including clause 2.1.14 on service penetrations.
What we’re called out for in Mortimer
On a busy project, programme pressure can mean fire stopping is rushed or left to whichever trade is closest. That is how unsuitable products and improvised details end up in compartment walls, which then have to be put right.
Site and facilities staff are often the first to spot these:
- Openings left by services added after handover
- Damaged fire seals in risers and voids
- Head-of-wall gaps with no fire seal
- Penetration schedules that need working through
Older community buildings such as Mortimer Methodist Church that have been rewired or given new heating can have service gaps through walls worth checking against the specification.
Questions to ask before you book
- Is the sealant right for the movement and the substrate?
- Their approach to joint depth and backing
- Are they CHAS accredited or on Constructionline?
- Do they follow the manufacturer’s priming guidance?