Hertfordshire · England
Fire-rated sealant in Mackerye End, Hertfordshire
Professional fire rated sealant in and around Mackerye End, with every bit of old sealant taken out first and a 12-month guarantee.
- Gaps flagged on a fire risk assessment
- Open joints along the top of partitions
- Unsealed gaps where pipes and cables go through a wall
How we handle fire rated sealant in Mackerye End
Until it’s heated, intumescent sealant behaves like an ordinary sealant; then it swells to help close the gap. The right product depends on the gap size, the substrate and what passes through, so we work to the manufacturer’s details. We are often asked to deal with unsealed gaps around fire door frames and gaps around pipes and cables through fire-resisting walls, across service penetrations, door frames and flats & HMOs.
For a small place like Mackerye End, the journey and timings are agreed in advance, so the job can fit around bookings, guests or opening times where possible.
The work is covered for a year after we finish. If there’s a problem with it, please ring 0345 464 0079 or drop us an email.
- Where
- Mackerye End (AL5)
- Wider area
- Hertfordshire
- Guarantee
- A year, on every job
- Price
- A clear price before work begins
- Call
- 0345 464 0079
- Updated
- 26 October 2026
DIY sealant or a professional job?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Why deal with it now?
Items left open on a fire risk assessment tend to come back at the next review. Having them sealed and recorded now gives you evidence that the item was dealt with. Where a wall is exposed, as many are in small places like Mackerye End, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
What it costs depends on the size of the job, how much old material has to come out and access to the work. We give a clear quote before any work starts, so you know where you stand.
What you get with us
- Anti-fungal silicone where joints get wet
- We never seal over old sealant
- ARBOMaster approved applicator
- Homes, businesses and hotels
See our cost guide or what customers say.
For landlords and businesses
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Landlords and agents in Mackerye End can book us as well as householders. Sealant work between tenants is a simple way to keep a property in good order.
What we cannot put right
We’d rather tell you now than do work that will not last, so these are the limits:
- A wall that isn’t a fire-resisting element to begin with
- Big openings where sealant alone is not the tested solution
- Fire doors that need new seals, closers or hardware
If you’re not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer.
What we seal
- Pipe & cable gaps
- Linear gaps
- Door frames
- Flats & HMOs
- Service penetrations
- Plasterboard & masonry
What we do, step by step
When we arrive, we start by going over the job with you, so there are no surprises. We protect the surfaces around the joints before any work begins. Most jobs take a few hours for a handful of gaps, and longer for a whole building. In a small place like Mackerye End, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- Before starting, we go through the specification or action list with you.
- We measure every gap and note what it’s in and what passes through.
- Any non-fire-rated filler is removed and the faces cleaned.
- The specified fire-rated sealant goes in over any backing its detail requires.
- We hand over a list of locations and products for your files.
How to prepare
- Mention any leaks or damp you’ve noticed
- For indoor joints, keep the area dry beforehand if you can
- Let us know about earlier repairs to the joints
Get a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Related advice
Fire rated sealant around Mackerye End
In England, the Regulatory Reform (Fire Safety) Order 2005 requires a fire risk assessment for workplaces and for the common parts of blocks of flats, which is often where open fire-stopping gaps are first noticed. We apply fire-rated sealant to the assessor’s or designer’s specification and the product’s tested details.
Schools such as Sauncey Wood Primary School are buildings too, and service openings in fire-resisting walls need checking after any refurbishment. If you let a flat or house near Harpenden station, fire-rated sealant around pipes and cables through walls and floors needs making good whenever new services go through.
Mackerye End is about 1 mile north-east of Harpenden, in Hertfordshire. From the centre of Mackerye End to the outskirts, we cover fire rated sealant for every kind of property, from flats and houses to offices and hotels. Our area takes in 381 places across Hertfordshire. We also work in London, about 25 miles from Mackerye End.
We work across AL5 for fire rated sealant. Close by, we work in Lea Valley (1 mile south), Porter's End (1 mile north), The Folly (1 mile south-east), Blackmore End (1 mile north-east) and Bower Heath (1 mile north-west). We also work in nearby towns such as Watford (12 miles south), Hemel Hempstead (8 miles south-west), Stevenage (8 miles north-east), St Albans (5 miles south), Welwyn Garden City (6 miles east) and Hitchin (9 miles north).
Local landmarks in Mackerye End
Around Mackerye End, our work takes us to homes and buildings near The Cherry Trees pub, Sir John Lawes School and Lydekker Park, among other places. The nearest railway station is Harpenden station, roughly 1.7 miles south-west of the centre. Nearby you will also find St Albans City Hospital (4.8 miles south) and Harpenden Museum (1.9 miles south-west). The countryside around Mackerye End includes Wheathampstead Local Nature Reserve.
What we’re called out for in Mackerye End
Many open fire-stopping gaps are made after the building is finished. Electricians, plumbers and data installers drill through walls and ceilings and the hole they leave doesn’t always get resealed.
Look out for any of the following:
- Cracked or shrunken fire-rated sealant
- Damaged fire sealant left by other trades
- Gaps filled with a product that is not fire-rated
- Sealant items on a fire risk assessment action list
If you look after a church, hall or community building such as All Saints, service openings in its walls need the right fire-rated sealant, as in any building.
Comparing quotes
- Is the old sealant removed completely?
- Who turns up on the day
- What product goes in the joint
- How the joint is cleaned and prepared
Questions from Mackerye End
Is Mackerye End within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you cover Mackerye End for fire rated sealant?
Yes. We work across London and the South East, and Mackerye End is part of that. You can phone 0345 464 0079 or email us and let us know what needs doing, and we will give you a clear quote.
Can you match the sealant colour?
In most cases you can choose. We’ll tell you which colours the right product comes in and agree one before we start.
Is it OK to seal over old sealant?
No. The old sealant always comes out first, so the new sealant bonds properly.
Do you seal gaps around fire door frames?
Yes. We seal the gap between the frame and the wall with a suitable fire-rated product. The door leaf and its hardware need a door specialist.
Can tenants book the work?
Yes, but check with your landlord or agent first. Landlords are often happy for the work to be arranged.
What’s the difference between intumescent and fire-rated sealant?
Fire-rated is the broad term for sealants tested for fire stopping. Intumescent ones swell in heat, and they’re one option among several. The specification and the tested detail decide which is used.
Should I try DIY first?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Towns and villages near Mackerye End
Also in Mackerye End
How to look after the new joints
Good habits help new joints last longer. A few tips:
- Ask which product was used before you paint
- Include fire stopping when you schedule refits
- Keep the record of products and locations with your fire safety documents
- Don’t fill fire-stopping gaps with ordinary foam or silicone
Let contractors know where fire stopping has been done, and make sure anything they disturb is resealed with a suitable product. A lot of damaged fire stopping comes from later work.
When you plan work that goes through walls or ceilings, plan the fire stopping too. Doing it at the time avoids leaving gaps behind.