Hertfordshire · England
Fire Rated Sealant in Lemsford
Fire rated sealant for Lemsford and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Gaps filled with a product that is not fire-rated
- Gaps flagged on a fire risk assessment
- Holes left by a change of layout
How we handle fire rated sealant in Lemsford
Door frame gaps, linear joints and holes around services all have their own details. Measuring the gap and checking what it’s made of comes first, then apply it to the depth its tested detail calls for. We work on linear gaps, service penetrations and plasterboard & masonry, and people most often call us about standard silicone or caulk in a fire-stopping gap and cracked or shrunken fire-rated sealant.
For holiday lets, converted business premises or a community building near Lemsford, washroom and kitchen sealant and any fire-rated joints need the same attention as anywhere.
There’s a 12-month guarantee on every job, large or small.
- Location
- Lemsford (AL8)
- Wider area
- Hertfordshire
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Can I do it myself?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
If you’ve already had a go yourself, that’s fine. We cut it out and start again, so just mention it when you contact us.
Questions from Lemsford
I let a flat near Welwyn Garden City station. Can you help?
Yes, we work for landlords and letting agents. Just call 0345 464 0079 or send us an email and tell us about the property, and we will send you a clear quote.
Do you cover Lemsford for fire rated sealant?
Yes, Lemsford is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or email us and let us know what needs doing, and we will give you a clear price.
Can you match the sealant colour?
Most of the time, yes. We’ll tell you which colours the right product comes in.
Is standard sealant good enough for a fire gap?
No. It might close the gap, but it isn’t a fire-rated seal. Use a product tested for that gap and service, or ask us to do it.
What fire rating will the seal have?
We don’t certify fire stopping or quote ratings. Our part is installing the specified product to its tested details and list the locations and products for you.
Do you have insurance?
Yes, we’re fully insured for domestic and commercial work.
Do I have to be there?
It depends on the job. Inside work needs someone to give us access.
Will you assess my building’s fire safety?
No. Your fire risk assessor, designer or building control decides that. Our job is applying the sealant to their specification.
What we’re called out for in Lemsford
Over time, buildings change layout and use. Conversions to flats and HMOs, and office refits, create new walls and new routes for services, with gaps to match.
The problems people usually mention when they call are:
- Open joints along the top of partitions
- Gaps filled with a product that is not fire-rated
- Unsealed gaps where pipes and cables go through a wall
- Gaps left after a refit or conversion
Letting a property close to Welwyn Garden City station? Then any gap left by new services in shared walls should be closed with a fire-rated product.
Comparing quotes
- How hidden problems are handled
- Which colour the sealant will be
- Are they insured?
- Whether they seal over old material or remove it
What affects the cost of fire rated sealant
Jobs vary more than people expect. What affects the quote:
- The old material and how stubborn it is
- Any working-time requirements on site
- The number and length of the joints
- The product the joint needs
We don’t show prices on the website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or send us an email.
Helping us quote
When you contact us, it’s useful to know:
- Where the job is, and your postcode
- If someone has resealed it before
- Photos by email, if that’s easy
- Any access issues, like height or stairs
There’s no standard price list. Instead, we send you a clear quote for your job. To arrange one, ring 0345 464 0079 or drop us an email.
Keeping the joints in good condition
A little care helps the new joints last. We recommend:
- Include hidden areas like risers in routine checks
- Never patch a fire seal with standard sealant
- Keep pictures of seals that will be hidden
- Flag any open gap you spot round a pipe or cable
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.
A gap left open in a fire-resisting wall or floor lets smoke spread in ways the building wasn’t designed for. Sealing it early is a simple step to take.
When it isn’t the sealant
New sealant can’t fix everything, and we will tell you before any work starts. It will not solve:
- Sign-off of the building, which sits with building control or your assessor
- Doors that aren’t fire doors in the first place
- Openings too large for sealant, which need batts, boards or another system
If in doubt, call 0345 464 0079 or email us and we’ll say what we think.
Joints and surfaces we work on
- Flats & HMOs
- Plasterboard & masonry
- Door frames
- Pipe & cable gaps
- Service penetrations
- Linear gaps
How it works
We keep the work tidy and contained to the joints we’re treating. Expect the work to take a few hours for a handful of gaps, and longer for a whole building. For a village or hamlet like Lemsford, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We start with the survey or action list, checking the size and surfaces of every gap.
- We remove any old or unsuitable filler and clean the gap.
- Where the tested detail needs backing or fill, we fit it.
- Fire-rated or intumescent sealant is applied to the right depth and tooled.
- Locations and products are noted so you have them on file.
Before we arrive
- Try not to wet indoor joints just before the visit
- Tell us about any previous sealing or DIY attempts
- Tell us if parking is tricky
Ask for a quote
For a quote, call 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You will have a clear quote before any work starts.
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Also near Lemsford
Also in Lemsford
Workplaces and buildings in Lemsford
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, and gaps around services are often picked up there. We work to the specification you’re given, installing the product to its tested details.
For site and facilities teams at buildings such as Applecroft School, service openings in fire-resisting walls need checking after any refurbishment. If you look after a church, hall or community building such as Church of St John the Evangelist, service openings in its walls need the right fire-rated sealant, as in any building.
Lemsford is about 2 miles west of Welwyn Garden City, in Hertfordshire. Anywhere in AL8, our applicators can take on fire rated sealant. Lemsford is one of 381 places in Hertfordshire where we work for fire rated sealant. We also work in London, around 21 miles away.
Here we cover the AL8 postcode area for fire rated sealant. Fire rated sealant is available to properties on Mill Close, Lemsford Village and Great North Road. If you’re just outside Lemsford, we cover Stanborough (1 mile south), Coleman Green (2 miles west), Cooper's Green (2 miles south-west), Hatfield (2 miles south) and Smallford (3 miles south-west). Larger places within reach include Watford (12 miles south-west), Hemel Hempstead (10 miles west), Stevenage (8 miles north), St Albans (5 miles south-west), Harpenden (5 miles west) and Hitchin (11 miles north).
What’s near Lemsford
Locally, jobs take us to homes and businesses close to Stanborough Park, Stanborough School and The Sun Inn. Lemsford’s nearest station is Welwyn Garden City station, roughly 1.2 miles east of the centre. Nearby you’ll also find Queen Elizabeth II Hospital (2.1 miles south-east) and The Bunker at Hatfield Police Station (2.1 miles south). Green spaces nearby include Lemsford Springs.
For landlords and businesses
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.