Fire-rated sealing and fire stopping in Longmoor, Hampshire
Our CSCS-carded applicators take on fire-rated and intumescent sealing of service penetrations and linear gaps in Longmoor and the surrounding area. Send details for a fixed quote.
- Improvised or mixed-product fire seals
- Unsealed penetrations discovered above suspended ceilings
- Fire-stopping items raised at inspection or handover
Fire stopping in Longmoor
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
Questions about Longmoor
Is Longmoor Enterprise Park, near Longmoor, within your area?
Yes, sites like Longmoor Enterprise Park are within our area, along with the rest of Longmoor. To start, just call 01277 525 020 or send photos by email with the unit, the joints involved and your access times.
How does the removal of BS 476 from Approved Document B affect fire-rated sealing in Longmoor?
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. Whichever applies, we install the specified product to its tested detail; the specification is for the designer to set.
What happens if old sealant might contain asbestos?
Managing asbestos is the dutyholder’s responsibility, so we will ask for the register before work on an older building. If anything suspect turns up, we stop until it’s tested.
Do you have public liability insurance?
Yes. Mastic Doctor is fully insured, public liability included.
When can the area be used after sealing?
That comes down to the sealant and the temperature. Some take light use quickly, others need longer to cure, and we confirm it before leaving site.
Do you work in Longmoor?
Yes. Longmoor is in our area and the rest of Hampshire. To discuss a job, call 01277 525 020 or email a schedule or drawings.
Will you just go over the old sealant?
No. We cut the old material out and clean the joint back before sealing, because fresh silicone will not bond with aged silicone.
About our fire stopping in Longmoor
A lot of fire-stopping work comes after M&E installation, a refit or a tenant fit-out. Each new cable, pipe or data route cut through a fire-resisting wall leaves an opening behind. We close the openings listed on your schedule, using the specified sealant and detail. If you have old intumescent sealant that has split away and openings left by services added after handover, we can help. A specialist sealant contractor works differently from a general builder: in Longmoor, that means joint design, primers and backing rod as standard.
Rural conversions around Longmoor can put new fire-resisting partitions inside older structures. A penetration seal only performs as tested if product, substrate, service, gap and depth all match the detail.
Our workmanship is guaranteed for 12 months, wherever the site is. If a joint we sealed fails because of how it was installed, we come back and put it right.
- Where
- Longmoor (GU33)
- Wider area
- Hampshire
- Cover
- A 12-month guarantee
- Price
- Quoted before any work starts
- Phone
- 01277 525 020
- Page updated
- 3 November 2026
Nearby places to Longmoor
Also in Longmoor
How a job runs
Occupied buildings need a little choreography. We sign and contain the area we are in, keep walkways clear and work section by section so the rest of the building stays in use. Jobs in and around smaller places like Longmoor are normally planned as a single visit, so we ask for photos and rough sizes first. Then the right materials arrive with us.
- The specification and schedule come first, so we know which details apply.
- We plan the sequence of floors, risers and voids with you.
- Each opening is checked for wall or floor type, service, gap and depth.
- Unsuitable material is removed and the opening cleaned.
- The specified backing and sealant go in to depth and are finished neatly.
- Anything outside the detail is reported to you rather than sealed.
Getting the site ready
- Let us know about inductions and permits
- Send any specification or drawings in advance
- Explain the parking and delivery arrangements
Getting a fixed quote
Specifications, drawings and tender packages are welcome with any enquiry, and we will price the work to it. Smaller jobs need nothing more than photos and a few notes.
Advice
Honest limits
A proper diagnosis includes knowing what sealant can’t do. You’ll hear from us if the cause turns out to be one of these:
- Approving the work on behalf of building control
- Plastic pipes whose detail calls for a collar or wrap
- Fire doors, dampers or other fire safety equipment
If you’re not sure, just call 01277 525 020 or use the quote form and we’ll give you a straight answer before you book.
Where we work in Longmoor
- Service gaps in risers
- Cable penetrations
- Joints between fire-resisting walls and floors
- Linear gaps at wall heads
- Small duct penetrations where the tested detail allows
- Pipe penetrations
How the job changes by surface
Risers and ceiling voids
Risers and ceiling voids hold most of a building’s service penetrations. Access is often tight, so we agree it with you in advance along with any permits your site needs.
Metal pipes
Sealant details often cover copper and steel pipework. The tested detail sets the pipe size range, gap, depth and whether insulation can stay on and we confirm each before sealing.
Cost factors for service penetrations
These are the things that shape the price:
- Distance, for remote addresses
- Whether the work must be split into stages
- The product specified
- Removal of failed or old sealant
Pricing service penetrations depends on quantities, condition and access, and any specification that applies. Call for a quote.
What to include in your enquiry
The more we know, the firmer the quote. When you get in touch, include:
- The asbestos register, for older buildings
- Whether the building will be occupied during the work
- The postcode of the building
- Approximate linear metres or a joint schedule
Pricing a project or setting a maintenance budget? We’ll quote against your scope and drawings that you can work with. If you have questions first, call the office on 01277 525 020 or send details through our quote form.
Compartment walls and floors in Longmoor
For England, the fire stopping of penetrations is dealt with in Approved Document B. Its BS 476 references are being withdrawn from 2 September 2029, with BS EN 13501-2 classification taking over, subject to transitional arrangements. We install whatever has been specified, to the product’s tested detail. Central London is about 45 miles from Longmoor. Offices around the capital are refitted often, and the cabling that follows can breach fire-resisting walls.
Offices at parks like Longmoor Enterprise Park (under half a mile west of Longmoor) are re-cabled with each new tenant, and compartment walls need sealing afterwards to the tested detail. At a healthcare site like Chase Hospital (2.3 miles north of Longmoor), new services through compartment walls are a constant, and each needs the specified seal.
Longmoor is about 3 miles south of Bordon, in Hampshire. Commercial clients in Longmoor use us for work on service penetrations. 723 places across Hampshire fall within our area, Longmoor among them. Portsmouth is covered too, some 20 miles away.
Commercial sites across GU33 are covered. We cover commercial and managed buildings on Woolmer Road, Roberts Road and Methuen Road and the roads nearby. Nearby places we also cover include Greatham (1 mile west), Woolmer (1 mile north-west), Liss Forest (2 miles south-west), The Mint (2 miles south) and Blackmoor (2 miles north-west). Nearby towns on our patch include Havant (15 miles south), Fleet (14 miles north), Horndean (13 miles south-west), Aldershot (13 miles north), Alton (7 miles north-west) and Waterlooville (15 miles south-west).
Near you in Longmoor
For rail, the closest station is Liss station, roughly 2.3 miles south-west. Nearby you’ll also find The Romany Museum (3.4 miles north-west) and Chase Community Hospital (2.3 miles north). Open spaces near Longmoor include Wheeler's Down and Liss Riverside Railway Walk North.
Why deal with it now?
An improvised seal can look finished while offering no tested performance. Correcting it means cutting it out and starting again with the specified product. Halls, stores and units around places like Longmoor may not be checked every day, so a failed joint can leak for a while before anyone sees it. Resealing early avoids that.
The specified product makes a difference, and so does the preparation. Access, phasing and site rules also count.
Why us?
- One number for every site we cover
- Constructionline member for supplier checks
- Products installed to the manufacturer’s instructions
- CHAS accredited
See our cost guide or how we’re accredited.
When to call us in Longmoor
Head-of-wall joints and wall-to-wall junctions are frequent weak points. Movement in the frame or slab can open the joint, and the wrong product can split as a result. The tested detail for a linear joint states the width and movement it covers.
Things that usually lead to an enquiry:
- Fire-rated sealant that has cracked or shrunk back
- Open linear gaps along the top of fire-resisting walls
- Fire seals cut back for extra cables and never reinstated
- Fire-stopping items raised at inspection or handover
For a school such as Greatham Primary School, penetration sealing fits best at the end of the summer works.
Before you book anyone
- What level of public liability insurance do they hold?
- How the joint faces will be prepared and primed
- How the existing material will be dealt with
- Are they CHAS accredited or on Constructionline?