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

Fire Stopping in South Weirs

Fire-rated and intumescent sealing of service penetrations and linear gaps throughout South Weirs and nearby, carried out by CSCS-carded applicators. CHAS accredited and fully insured.

  • Old intumescent sealant that has split away
  • Unsealed joints where partitions meet the slab
  • Fire seals cut back for extra cables and never reinstated
1
Send details
Send the specification, photos or a marked-up plan.
2
Get a quote
Scope agreed and priced before anything starts.
3
We seal
The right sealant, to the right depth, neatly finished.
4
Guaranteed
Our workmanship is guaranteed for 12 months.
Covering the South East & Scotland
CHAS & Constructionline
£5m public liability

Fire stopping for businesses in South Weirs

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

Where services cross fire walls in South Weirs

South Weirs has plenty of hotels close by, all within 2 miles. Bedroom-to-corridor walls in hotels are normally fire-resisting, so new cabling or pipework through them has to be sealed to the tested detail. In England, Approved Document B covers fire stopping of openings and penetrations. References to the older BS 476 classes are being removed from it from 2 September 2029, after which the European classification, BS EN 13501-2, is the route, subject to transitional arrangements. What we install is set by the specification, and it goes in to the tested detail.

For a site team at a college like Brockenhurst College, 1.3 miles north-east of South Weirs, fire-rated sealing is best scheduled after the summer works. Large healthcare estates like Lymington New Forest Hospital, 3.7 miles south-east of South Weirs, change their services often, so penetration seals are worth checking after M&E work.

South Weirs is about 4 miles north-west of Lymington, in Hampshire. We cover commercial sites throughout South Weirs, whether it’s a single job or part of a planned programme. 723 places across Hampshire fall within our area, including South Weirs. We also cover Southampton, around 11 miles from South Weirs.

Business premises anywhere in SO42 are within our area. Just outside South Weirs, we also work in Brockenhurst (1 mile north-east), Setley (1 mile east), Balmerlawn (2 miles north-east), Emery Down (4 miles north) and Lyndhurst (4 miles north). Nearby towns on our patch include Eastleigh (15 miles north-east), Totton (8 miles north-east), Chandler's Ford (15 miles north-east), Hedge End (15 miles north-east), Lymington (4 miles south-east) and Romsey (13 miles north).

Local landmarks in South Weirs

The nearest railway station is Brockenhurst station, about 0.9 miles east. Well-known places in the area include Lymington New Forest Hospital (3.7 miles south-east).

Map of South Weirs © OpenStreetMap contributors

How we handle fire stopping in South Weirs

Every service that crosses a compartment wall or floor leaves an opening, and that opening needs sealing to hold back fire and smoke. Our job is fitting fire-rated and intumescent sealant at those service penetrations, and along linear gaps, where it is the specified product. Each seal follows the manufacturer’s tested detail. The enquiries we see most involve damaged fire seals in risers and voids and openings left by services added after handover, across pipe penetrations, cable penetrations and service gaps in risers. Most enquiries from South Weirs start with one failed joint and grow into a wider look at the building: we look at the rest while we’re there and tell you what we find.

Smaller places such as South Weirs still have buildings with fire-resisting walls and floors: schools, halls, care homes and commercial conversions. Any service penetration through those walls should be closed with the specified product, set out as its test evidence shows.

We stand behind the joints we seal with a 12-month guarantee. It covers how we prepared and applied the sealant.

Where
South Weirs (SO42)
Region
Hampshire
Guarantee
A 12-month guarantee
Quotes
Quoted before any work starts
Phone
01277 525 020
Page updated
3 November 2026
Mastic Doctor team members lined up next to their branded vans outside an office building

Diagnose, treat, sign off

When we get to site, we report to your site contact and complete whatever induction the building runs. Everything around the joints gets protected before any cutting starts, with the work itself usually taking a single visit for a short list of penetrations, or a phased programme for a whole building. Rural sites near South Weirs may need directions, gate codes or a contact on site. Add it to your enquiry and we will build it into the plan.

  1. We start with your penetration schedule, drawings or specification.
  2. We plan the sequence of floors, risers and voids with you.
  3. Each opening is checked for wall or floor type, service, gap and depth.
  4. Unsuitable material is removed and the opening cleaned first.
  5. The specified backing and sealant go in to depth and are finished neatly.
  6. We tell you about openings that need a different product.

Before we start on site

  • Point out any areas we must not close
  • Confirm the product named in the specification
  • Send your site hours and access windows

Getting a fixed quote

Pricing a project or setting a maintenance budget? We’ll quote against your scope and drawings that you can work with. For a chat about it beforehand, ring 01277 525 020 or use the quote form.

Get a quick quote

Advice

How the job changes by surface

Drylining partitions

Plasterboard partitions are tested as a specific construction. The sealant detail has to be tested in that wall type, with the stated board layers first.

Small ducts

We seal around ducts only within what the tested detail covers. Dampers and ductwork systems themselves are outside our work.

Signs you need fire stopping in South Weirs

Some service penetrations were never sealed at all. They come to light during inspections, refits or when another trade lifts a tile.

Site and facilities staff are often the first to spot these:

  • Hidden openings found during inspections
  • Builders’ foam or ordinary silicone in compartment walls
  • Open linear gaps along the top of fire-resisting walls
  • Fire-stopping items raised at inspection or handover

For a building such as Church of St Saviour, new heating or data runs are the usual reason penetrations need sealing.

Before you book anyone

  • Can the work be phased to keep areas open?
  • Whether old or failed sealant will be cut out, not overlaid
  • The terms of the workmanship guarantee
  • Are they CHAS accredited or on Constructionline?

Our contractor checklist

Cost factors for service penetrations

Your fixed quote is built from the real scope. It allows for:

  • Backing rod, priming and other preparation
  • Site requirements such as inductions and permits
  • The product specified
  • Any access equipment needed

What a job costs comes down to how many linear metres there are, how much old material needs removing and the access. Call for a quote when you are ready.

What to include in your enquiry

For an accurate fixed quote, we need to understand the site. Useful things to include:

  • Access details, including height
  • Specification clauses that apply
  • The type of building and who uses it
  • The site address and postcode

If there’s a specification, drawings or a tender package, send it with your enquiry, and we will price the work to it. For smaller jobs, photographs and a description will do.

General trades versus a specialist

A short, simple internal joint is often within reach of a maintenance team. Where it goes wrong is preparation: new sealant over old, damp or dusty faces, or the wrong product for the movement.

Paperwork matters too. Main contractors and clients often ask for CSCS cards, RAMS and insurance details, and we will confirm the paperwork you need with the quote.

FAQs: South Weirs

How does the removal of BS 476 from Approved Document B affect fire-rated sealing in South Weirs?

References to BS 476 classes are being removed from Approved Document B from 2 September 2029, after which BS EN 13501-2 classification is the route, subject to transitional arrangements. The designer or fire engineer sets the specification, and we install the product to the manufacturer’s tested detail.

Could you schedule work at a campus like Brockenhurst College for the vacation?

Yes. Education sites normally want the work in vacations or in phases during term, and we plan to suit. Tell us which site documents you need, such as RAMS, our insurance certificate or CSCS details, and they’re confirmed with the quote.

Will you quote for a small job?

Small jobs are welcome alongside larger packages. Send details for a fixed quote.

How long will the new sealant last?

It depends on movement, UV and weather, cleaning, traffic and the product. Sealant joints are maintenance items, so inspect them regularly.

When can you be on site?

Give us your site hours and any access windows in your enquiry, and we will schedule the work to suit. Our office runs Monday to Friday, 8am until 5pm.

Does weather matter for sealant work?

It can, when the joints are outside. Sealant won’t bond properly to a wet or frosty joint, so external work may be moved if conditions aren’t right. Internal work is far less affected.

Can the sealant be colour-matched?

Often, yes. Sealants are made in a wide range of standard colours, and matching to RAL references or nearby finishes is commonly requested. We’ll confirm the colours available for the specified product.

When it isn’t the sealant

Our job is the joint, not everything around it. On its own, sealant can’t deal with:

  • Reviewing a building’s overall fire safety
  • Openings that need collars, wraps, batts or boards rather than sealant
  • Walls or floors that aren’t fire-resisting to begin with

If in doubt, speak to us on 01277 525 020 or email drawings and photos and we’ll say what we think.

Surfaces we seal

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

Trusted. Accredited. Insured.