Hertfordshire · England
North Mymms Remedial Sealant
Professional remedial sealant in and around North Mymms, with old sealant always removed completely.
- Wide, uneven beads that look worse than the old ones
- Floor or wall movement joints that have failed
- Products that weren’t meant for the joint
What we can’t put right
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Tiles that have come away from the wall
- Movement from fittings that are not supported
- Leaks from a shower valve, waste or pipework (a plumber’s job)
If in doubt, phone 0345 464 0079 or drop us an email and we’ll say what we think before you book.
Surfaces we seal
- Botched or over-sealed joints
- Shrunken worktop sealant
- Expansion joints
- Mouldy bath & shower sealant
- Failed movement joints
- Leaking tray & enclosure joints
Remedial sealant for homes and businesses in North Mymms
Not every leak is a sealant leak. A cracked tray, a failed shower valve or a leaking waste can look just the same. If that’s what we find, we’ll tell you rather than reseal something that will not fix it. We’re often asked to deal with wide, uneven beads that look worse than the old ones and black mould underneath the bead, across failed movement joints, botched or over-sealed joints and mouldy bath & shower sealant.
Homes around North Mymms 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.
Your job is guaranteed for a year, as with all our work.
- Location
- North Mymms (AL9)
- Wider area
- Hertfordshire
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
The process
Good joint work is mostly preparation, and we do not rush it. Joints are cleaned back and dried before anything new goes in. In total, it normally takes a few hours, depending on how many layers have to come out. For a village or hamlet like North Mymms, 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 out whether the problem is the sealant, movement or a leak.
- Old beads and residue are removed down to clean surfaces.
- 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.
Before we arrive
- Plan for the work area to be out of bounds to pets and children
- Clear items away from the joints we’re working on
- For business premises, tell us about site rules or sign-in
Ask for a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. Whenever you’re ready, ring 0345 464 0079 or email us.
Advice
Can I do it myself?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
What we are called out for in North Mymms
All sealant wears out eventually. Mould grows into the silicone, the surface hardens and the bead shrinks. Then the only fix is removal and a new bead.
Most people get in touch when they notice one of these:
- Repeat leaks from the same joint
- Movement joints that have split or pulled away
- Thick, messy sealant smeared over tiles
- Black mould underneath the bead
If you look after a building such as Brookmans Park Primary School, its toilets, changing areas and kitchens need their sealant renewed like any other building’s.
Questions to ask before booking
- Is the old sealant removed completely?
- Whether you can choose the colour
- Are they insured?
- What preparation is included
Nearby places to North Mymms
Other services in North Mymms
For landlords and businesses
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together.
Leave it or put it right?
A failed seal rarely means a new bathroom. When the fittings are sound, stripping and resealing the joints is often enough. If they’re not, we will tell you. Where a wall is exposed, as many are in small places like North Mymms, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part.
Why North Mymms clients choose us
- Colour agreed with you before we start
- 180+ five-star Google reviews
- Sanitary silicone with an anti-fungal additive in wet areas
- We never seal over old sealant
Take a look at our cost guide and what customers say.
Keeping the joints in good condition
Good habits help new joints last longer. A few tips:
- Deal with small splits early
- Never seal over old silicone
- Find out why the sealant failed first
- Never fill a movement joint with mortar or grout
Leave the new joint to cure fully before it gets wet or moves: usually around 24 hours, or as long as we advise.
Mould trapped under over-sealed joints spreads unseen. By the time it shows through, the joint is well past saving.
Your questions about remedial sealant in North Mymms
Can you do remedial sealant in North Mymms?
Yes. We work across London and the South East, and North Mymms is part of that. You can phone 0345 464 0079 or email us and let us know what needs doing, and we’ll give you a clear price.
Is North Mymms within the area you cover?
Yes. North Mymms is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you do commercial work?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. Working times can be discussed when we quote.
Do you remove the old sealant?
Yes, always, and completely. New sealant won’t bond properly to old, so the joint is cleaned back first.
Can I do it myself?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
How long does remedial resealing take?
Longer than a simple reseal, because every layer has to come out. For most joints, it’s a few hours.
What does remedial sealant cost?
It depends on the job, so we quote each one individually. To get one, call 0345 464 0079 or send us an email and let us know what needs doing and where.
Is it messy?
Tidy work is part of the job. Nearby surfaces are protected, and we clear up when we’re done.
Remedial sealant around North Mymms
Most of the South East has hard water, so limescale builds up on sealant, grout and fittings, and it has to be cleaned off before new sealant goes in.
Letting a property close to Brookmans Park station? Then failed or mouldy sealant is worth putting right between tenancies, before it turns into a leak. Homes close to Church of St Mary the Virgin include some older properties, and timber floors under older bathrooms flex, so joints need a sealant that moves with them.
North Mymms is about 2 miles north-west of Potters Bar, in Hertfordshire. If you need remedial sealant in North Mymms, please call 0345 464 0079 or email us for a quick quote. We are based in Crawley and cover Hertfordshire. North Mymms is one of 381 towns and villages in Hertfordshire where we work for remedial sealant. London is on our list too, around 16 miles away.
Our applicators cover all of AL9 for remedial sealant and the streets around it. Streets in the area include St Mary's Church Road, Abdale Lane and Warrengate Road, all of which we cover. If you’re just outside North Mymms, we cover Welham Green (1 mile north), Colney Heath (2 miles north-west), Sleapshyde (3 miles north-west), Hatfield (3 miles north) and Shenleybury (3 miles west). Larger places within reach include Watford (9 miles south-west), Hemel Hempstead (11 miles west), Stevenage (13 miles north), St Albans (5 miles north-west), Welwyn Garden City (6 miles north) and Harpenden (9 miles north-west).
Landmarks near North Mymms
We work in homes and buildings around Chancellor's School, North Mimms Park and The Old Maypole Public House, among other places. For rail, the closest station is Brookmans Park station, about 0.7 miles east. A little further out are Shenley Hospital (3.5 miles south-west) and Potters Bar Museum (2 miles south-east). The countryside around North Mymms includes Furzefield Wood and Lower Halfpenny.