Hertfordshire · England
Old Knebworth Fire Rated Sealant
Fire rated sealant in Old Knebworth from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Standard silicone or caulk in a fire-stopping gap
- Fire stopping disturbed by later work
- Cracked or shrunken fire-rated sealant
Old Knebworth questions
Is Old Knebworth in your area for fire rated sealant?
Yes. We work across London and the South East, and Old Knebworth is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Will you come out to Old Knebworth?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Is there a guarantee?
Yes: twelve months. If anything is not right with the work within the year, let us know and we’ll sort it.
Is intumescent sealant the same as fire-rated sealant?
Fire-rated is the broad term for sealants tested for fire stopping. Intumescent types expand when heated, and they’re one of the options. The specification and the tested detail decide which is used.
Do you carry out fire risk assessments?
No. That is for a fire risk assessor, designer or building control. Our job is applying the sealant to their specification.
Can new sealant go over the old?
No, it will not last. It may look fine at first, but the new layer lifts away from the old one. The old sealant has to come out completely.
Are you fully insured?
Yes, we’re fully insured for domestic and commercial work.
Can I choose the sealant colour?
Most of the time, yes. We will tell you which colours the right product comes in.
Fire rated sealant in Old Knebworth
Bigger jobs can be worked through in stages, flat by flat or floor by floor, with each location and product recorded. It gives you a list to keep with the building’s fire safety documents. If you have holes left by a change of layout and cracked or shrunken fire-rated sealant, we can help, whatever the surface.
In a village or hamlet like Old Knebworth, commercial work is more likely to be a pub, a farm shop, holiday lets or a village hall than an office block. They all have washrooms, kitchens and service openings that need the right sealant.
All our work is covered by our 12-month guarantee.
- Location
- Old Knebworth (SG3)
- Region
- Hertfordshire
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
How to look after the new joints
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Flag any open gap you spot round a pipe or cable
- Take pictures of fire stopping before ceilings or boxing go back
- Check whether a sealant can be painted before decorating over it
- Ask every contractor to reseal any fire stopping they disturb
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.
Leave a fire-stopping gap open and smoke can move through the building much more easily. Sealing it early is a simple step to take.
Towns and villages near Old Knebworth
Other services in Old Knebworth
What we’re called out for in Old Knebworth
Movement in the structure can open gaps too: a seal that cracks or pulls away leaves a path for smoke. Damage from cleaning, knocks and maintenance adds to it.
If you can see any of these, it’s time to have the joints looked at:
- Ordinary sealant used where a fire-rated product was needed
- Fire seals that have cracked with movement
- Damaged fire sealant left by other trades
- Linear gaps at the head of walls
Community buildings like Church of St Mary and St Thomas are part of the picture too: gaps around pipes and cables are worth checking after any building work there.
Questions to ask before booking
- Whether VAT is included
- How the surfaces are prepared before sealing
- What product goes in the joint
- Who does the work, and how experienced they are
What affects the cost of fire rated sealant
Jobs vary more than people expect. The main factors:
- Working hours on commercial sites
- How much old sealant there is and how hard it is to remove
- How much there is to do
- How many areas need sealing
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. The price is agreed before we begin.
Asking for a quote
To help us quote quickly, let us know:
- Access, such as stairs, a lift or height
- How many joints, rooms or windows are involved
- Pictures of the joints, sent by email
- The problem you’ve noticed
Every job is quoted individually, so start by telling us what you need. Simply phone 0345 464 0079 or email us and describe the job, and pictures are welcome.
What sealant work can’t fix
It helps to know what we cannot do:
- Doors that aren’t fire doors in the first place
- Walls or floors that weren’t built to resist fire
- Issuing a fire rating or certificate for a building
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think before booking.
Where we work in Old Knebworth
- Flats & HMOs
- Plasterboard & masonry
- Pipe & cable gaps
- Service penetrations
- Linear gaps
- Door frames
DIY sealant or a professional job?
A DIY attempt does not rule out a professional job. We cut it out and start again, so just mention it when you contact us.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
The process
You don’t need to clear the whole room or building before we come, only the area right around the joints. We protect the rest, and the work takes from a few hours to a few days, depending on the number of gaps and the access for a typical job. For a village or hamlet like Old Knebworth, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- First we work through your list or survey, measuring each gap and checking what it’s formed in.
- Old or unsuitable sealant is cut out and the gap cleaned.
- Backing or fill is fitted where the product’s tested detail calls for 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.
How to prepare
- Plan for the work area to be out of bounds to pets and children
- For indoor joints, keep the area dry beforehand if you can
- Clear items away from the joints we are working on
Get a quote
Getting a quote is simple: let us know the job and the location and its rough size. A few pictures by email make the job easier to understand, and we’ll take it from there.
Related advice
What fire rated sealant looks like in Old Knebworth
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 work to the specification you’re given, installing the product to its tested details.
For landlords with property near Knebworth station, new cables or pipes through a fire-resisting wall leave a gap that needs the right sealant. Schools such as Barnwell School are buildings too, and service openings in fire-resisting walls need checking after any refurbishment.
Old Knebworth is about 3 miles south-west of Stevenage, in Hertfordshire. We provide fire rated sealant to homes and businesses in Old Knebworth and nearby, as part of our work across Hertfordshire. We cover 381 towns and villages across Hertfordshire. Our London page covers work nearby (26 miles or so).
Work in SG3 works the same way as everywhere else we cover. Fire rated sealant is available to properties on Old Knebworth Lane and Park Lane. Close by, we work in Nup End Green (1 mile south-west), Driver's End (1 mile south-west), Rableyheath (1 mile south), Pottersheath (1 mile south) and Langley (2 miles north-west). Further out, we also cover Hemel Hempstead (13 miles south-west), Stevenage (3 miles north-east), St Albans (10 miles south-west), Welwyn Garden City (5 miles south), Harpenden (7 miles south-west) and Hitchin (6 miles north-west).
Local landmarks in Old Knebworth
Around Old Knebworth, our work takes us to homes and buildings near Knebworth Park and Robin Hood And Little John Public House and the streets around them. The closest station to Old Knebworth is Knebworth station, about 1 mile east of the centre. Well-known places in the area include Lister Hospital (3.7 miles north) and Stevenage Museum (2.2 miles north). Green spaces nearby include Mardley Heath.
Work for landlords, hotels and businesses
In hotels, rooms out of use cost money, so the work can be planned room by room. We have worked in hotels as well as homes and businesses.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.