Hertfordshire · England
Remedial sealant & repairs in Old Knebworth, Hertfordshire
Remedial sealant in Old Knebworth from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Mould trapped under a layer of silicone
- Over-sealed joints coming away
- Torn expansion joints
The process
Good joint work is mostly preparation, so that is where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it usually takes a few hours, depending on how many layers have to come out. 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. Everything for the job comes with us, so a second trip is avoided where possible.
- The failure is looked at first, so we know whether it’s sealant, movement or water from elsewhere.
- Each layer is cut out and the residue cleaned off.
- Mould is treated and the joint dried.
- The right product goes in, with backing where the joint moves.
- We finish neatly and point out anything that needs another trade.
How to prepare
- Let us know about earlier repairs to the joints
- Let us know if you’ve seen damp or leaks
- For business premises, tell us about site rules or sign-in
Ask for a quote
To get a quote, call 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We’ll give you a clear quote before any work starts.
Related advice
How we handle remedial sealant in Old Knebworth
A movement joint stops working when its sealant splits or sets hard. We cut out the failed sealant and set the depth with backing, then a flexible sealant matched to the movement goes in. Common call-outs are for black mould underneath the bead and torn expansion joints, on botched or over-sealed joints, mouldy bath & shower sealant and shrunken worktop sealant.
Homes around Old Knebworth are mostly houses and cottages rather than flats, some with bathrooms tucked into older rooms or extensions. The work is the same as anywhere: old material cut out, joints cleaned and a fresh finish laid.
A 12-month guarantee comes as standard, so you’re not left on your own once the job is done.
- Where
- Old Knebworth (SG3)
- Wider area
- Hertfordshire
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Also near Old Knebworth
What else we do in Old Knebworth
Should I try it myself first?
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
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.
Do you need remedial sealant in Old Knebworth?
How a joint is built matters as much as the product. A bead bonded on three sides, or laid too thick, cannot flex, so it tears when the joint moves. Backing rod or bond-breaker tape prevents it.
Signs it’s time to call us include:
- Gaps opening along the back of the worktop
- Wide, uneven beads that look worse than the old ones
- Black mould underneath the bead
- A shower that leaks however often it’s resealed
For landlords with property near Knebworth station, failed or mouldy sealant is worth putting right between tenancies, before it turns into a leak.
Comparing quotes
- What the quote includes, VAT included or not
- Who does the work, and how experienced they are
- How the joint is cleaned and prepared
- How the colour is chosen
What sealant work can’t fix
Sealant isn’t the answer to every problem, and we’ll tell you before we start. It will not solve:
- Plumbing leaks behind walls or under trays
- Cracks in the fitting rather than the joint
- Old mastic in a building from before 2000 that should be checked for asbestos before it’s disturbed
If you are not sure, just phone 0345 464 0079 or email us and we’ll give you a straight answer before you book.
What we seal
- Botched or over-sealed joints
- Mouldy bath & shower sealant
- Failed movement joints
- Leaking tray & enclosure joints
- Shrunken worktop sealant
- Expansion joints
Looking after it afterwards
After the cure time, these simple habits help:
- Do not wait for a small gap to become a leak
- Clean sealant with mild products only
- Never fill a movement joint with mortar or grout
- Keep an eye on the ceiling below the bathroom
Watch the joint over the first few weeks, particularly where the original failure was caused by movement. If anything changes, just phone 0345 464 0079 or send us an email.
A failing joint rarely gets better on its own. Each use pushes more water behind the bead, into whatever is behind or below. Sorting it early limits the damage.
Landlords, agents and businesses in Old Knebworth
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
We also work for property managers and facilities teams. We can quote a run of properties together.
FAQs for Old Knebworth
Do you cover smaller places like Old Knebworth?
Yes. Old Knebworth is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you cover Old Knebworth for remedial sealant?
Yes, Old Knebworth is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or send us an email and let us know what needs doing.
Do I need to be at home?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Can you remove sealant that is been put over old sealant?
Yes. We cut out all the layers and clean off the film, before resealing with a single bead.
Where are you based?
We work from Crawley. We cover Old Knebworth and the rest of Hertfordshire, along with the rest of our area.
Is there any odour?
There can be a smell while the sealant cures. Ventilation helps.
What do you put in the joint?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we will explain our choice.
Do you remove the old sealant?
Always. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
What affects the cost of remedial sealant
Call for a quick quote. What matters most is:
- Whether the work is at height
- Working hours on commercial sites
- The amount of work
- Any mould that needs treating
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.
What we need to know
What to tell us when you ask for a quote:
- The rough size of the job
- If it’s domestic, commercial or a hotel
- How we’d reach the joints
- The address or postcode of the job
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. Whenever you’re ready, call 0345 464 0079 or email us.
Remedial sealant around Old Knebworth
Most of the South East has hard water, which leaves limescale on sealant, grout and fittings.
Managing a site like Barnwell School? Then washroom and kitchen sealant there needs the same care as at home, and schools and businesses are part of our work as well as homes. If you live in an older home near Church of St Mary and St Thomas, bathrooms in older houses have often been refitted more than once, with sealant laid over sealant.
Old Knebworth is about 3 miles south-west of Stevenage, in Hertfordshire. If you need remedial sealant in Old Knebworth, it’s easy to get a quote: please ring 0345 464 0079 or drop us an email. We cover Hertfordshire from our Crawley base. Across Hertfordshire, we cover 381 places, Old Knebworth among them. There’s also a page for London, about 26 miles away.
We cover every part of SG3 for remedial sealant and the streets around it. Local streets include Old Knebworth Lane and Park Lane. Other places close to Old Knebworth include 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). Larger places within reach include 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).
What’s near Old Knebworth
We work in homes and buildings around Knebworth Park and Robin Hood And Little John Public House. The nearest railway station 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). For a walk, there’s Mardley Heath.