Fire-rated sealing and fire stopping in Frogmore, Hertfordshire
Work needed on a service penetration in Frogmore? We look at it, seal it with the right product and hand it over with a 12-month guarantee.
- Seals that don’t match their tested detail
- Expanding foam used as fire stopping
- Fire seals cut back for extra cables and never reinstated
Fire stopping across Frogmore
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 Frogmore
The test standards are BS EN 1366-3 for penetration seals and BS EN 1366-4 for linear joints and the results are classified to BS EN 13501-2. A rating such as EI 60 only holds when the product is installed as it was tested. Reproducing the tested arrangement on site is the part we take care of. 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 damaged fire seals in risers and voids. One point of contact handles commercial sealant work in Frogmore from the first photos to the final walk-round, for single jobs and planned programmes alike.
A job near Frogmore is typically planned around one visit, so send the specification and photos first. Design and sign-off belong to the designer or building control; we install what’s specified.
Every job we finish is backed by a 12-month workmanship guarantee. If our installation lets you down in that time, we return and fix it.
- Place
- Frogmore (AL2)
- Region
- Hertfordshire
- Guarantee
- 12 months on our workmanship
- Price
- Quoted before any work starts
- Phone
- 01277 525 020
- Updated
- 3 November 2026
Our process
Before any cutting starts, the area is protected: masking tape along the joint edges and sheeting over anything nearby. The work itself typically takes longer where risers, ceiling voids or occupied floors have to be worked through in sequence, and we clear our waste as we work. Rural sites near Frogmore may need directions, gate codes or a contact on site. Add it to your enquiry and we will build it into the plan.
- The specification and schedule come first, so we know which details apply.
- Access, permits and the order of areas are agreed with the site team.
- We compare every service penetration with its tested detail before sealing.
- Unsuitable material is removed and the opening cleaned so the seal starts clean.
- The specified backing and sealant go in to depth and are finished neatly.
- Anything outside the detail is reported to you rather than sealed.
Preparing the site
- Share the asbestos register for older buildings
- Arrange parking or a loading space
- Clear stock, furniture or equipment away from the joints
Ask for a quote
We quote a fixed sum against the scope you give us, so the cost is agreed before work starts. To ask for one, phone 01277 525 020 or use the quote form.
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Nearby places to Frogmore
Other services in Frogmore
What we can’t put right
Honesty saves time and money. Fresh joints won’t solve:
- Construction that lacks the fire resistance the seal relies on
- Writing the fire-stopping specification
- Issuing fire ratings or certificates for seals
If you are not sure, just phone 01277 525 020 or email the details over and we’ll give you a straight answer.
Joints and surfaces we work on
- Pipe penetrations
- Joints between fire-resisting walls and floors
- Linear gaps at wall heads
- Cable penetrations
- Service gaps in risers
- Small duct penetrations where the tested detail allows
Keeping the joints sound
Keep the joints in good shape with a few simple steps:
- Include service cupboards in routine inspections
- Brief every trade that openings they make must be sealed
- Record which product was used where
- Leave fire sealant to cure fully before covering it
Add risers, plant rooms and ceiling voids to routine fire-stopping checks. Watch for cracked sealant, new services with no seal and openings that have grown.
Ask every contractor who works in risers or voids to report openings they create. It costs little and catches breaches early.
What sets the cost
To price the job, we consider:
- Location, for remote and island sites
- The size and state of each joint
- The site’s rules and procedures
- How accessible the joints are
The specified product makes a difference, as does the preparation each joint needs. Access, phasing and site requirements come into it too.
Before you send an enquiry
To price the job accurately, we need a clear picture of the site. Send us:
- What the building is and how it’s used
- Clear photographs of the problem areas
- Whether an asbestos survey exists
- How the joints are reached, and at what height
Need a figure for a tender or a budget? We’ll quote against your scope and drawings that you can work with. For a chat about it beforehand, call the office on 01277 525 020 or send photos by email.
Where services cross fire walls in Frogmore
There are two care or nursing homes within about 2 miles of Frogmore. In a care home, any new pipe or cable through a fire-resisting wall should be sealed to the specified detail. Where that’s fire-rated sealant, we install it to the manufacturer’s tested detail. A 2-mile radius around Frogmore takes in a number of hotels. In hotels, bedroom and corridor walls are usually fire-resisting, so services added in a refit need sealing with the specified product.
Hotels like Mercure Noke Hotel St Albans, 1.3 miles west of Frogmore, are refurbished in phases, and each phase can open up compartment walls. Tenant changes at parks like North Orbital Commercial Park, 1.3 miles north-east of Frogmore, bring new data and services, and openings through fire-resisting walls need the specified seal.
Frogmore is about 2 miles south of St Albans, in Hertfordshire. Anywhere in AL2, it works the same way: send details, get a fixed quote, we seal, and the work is guaranteed. Frogmore is one of 371 places in Hertfordshire on our list for service penetrations. Sites around London have their own page, about 18 miles away.
Postcode districts covered here: AL2 for service penetrations. If your site is on Centaurus Square, Frogmore and Avian Avenue or close by, send details and we will quote for service penetrations. Close to Frogmore, our area also takes in Park Street (1 mile north-west), How Wood (1 mile west), Colney Street (1 mile south-east), Chiswell Green (1 mile north-west) and Sopwell (1 mile north). Nearby towns on our patch include Watford (5 miles south-west), Hemel Hempstead (6 miles north-west), Stevenage (15 miles north-east), Welwyn Garden City (8 miles north-east), Harpenden (7 miles north) and Hoddesdon (14 miles east).
Near you in Frogmore
In Frogmore, that means premises near The Old Red Lion pub and Marlborough Science Academy, among other places. Frogmore has its own railway station: How Wood station. Other landmarks nearby include Hypocaust Museum (2.3 miles north-west) and Hilfield Castle (4.5 miles south). For a walk, there’s Verulamium Lake and Broad Colney Lakes.
Signs you need fire stopping in Frogmore
Mixing products or improvising a detail breaks the link with the test evidence. An oversized gap, too shallow a bead, missing backing or two makers’ products combined are the usual culprits.
Look out for the following:
- Unsealed openings around new pipes and cables
- Snag lists that include open service penetrations
- Old intumescent sealant that has split away
- Builders’ foam or ordinary silicone in compartment walls
Hospital estates such as Kingsley Green Hospital, 1.6 miles south-east of Frogmore, are divided into fire compartments, and any service penetration through them should be sealed to the specified, tested detail.
Questions to ask before you book
- What the guarantee covers, and for how long
- Their pre-qualification and accreditations
- Whether primer will be used where the manufacturer specifies it
- How they’ll work around occupants
How the job changes by surface
Metal pipes
Copper and steel pipes are a common service penetration for fire-rated sealant. The tested detail sets the pipe size range, gap, depth and whether insulation can stay on, so we check each one.
Plastic pipes
Plastic pipes soften and collapse in a fire. Some intumescent sealants are tested on smaller plastic pipes, but many need a collar or wrap. We confirm material and size first and tell you if sealant isn’t the right product.
Questions about Frogmore
Is Frogmore too far out for you?
No. Places such as Frogmore are covered as much as the big towns. Our area covers London and the South East counties. Where we can, we group nearby jobs to make the most of each trip.
Is North Orbital Commercial Park, near Frogmore, within your area?
Yes. Estates, retail parks and business parks around Frogmore, North Orbital Commercial Park among them, are all within reach. To start, just call the office on 01277 525 020 or use the quote form with the unit, the joints involved and your access times.
Do you design or specify fire stopping?
No, that isn’t our role. Once you have a specification, we can price and install the sealant elements of it, and tell you if a detail needs another product.
What happens if old sealant might contain asbestos?
Managing asbestos is the dutyholder’s responsibility, so for older buildings we ask for the asbestos register first. If anything suspect turns up, we stop until it’s tested.
Which sealant will you use?
If the job is specified, we follow the specification. Otherwise, we recommend a product to suit the joint’s movement, the substrate and the conditions, following the manufacturer’s guidance.
Do you hold third-party fire-stopping installer certification?
No. We don’t hold a third-party fire-stopping installer certificate. Our credentials are CHAS accreditation, Constructionline membership and CSCS-carded applicators, and we are fully insured. If your contract requires third-party installer certification, we are not the right fit for that package.
How long before the joints can be used?
The product and site conditions decide that. Some take light use quickly, others need longer to cure, so we’ll confirm the curing time on the day.