Hertfordshire · England
Northaw Remedial Sealant
Problem with your failed sealant joints in Northaw? We cut out the old, prepare the joints and apply the right sealant.
- A second bead peeling off the first
- Leaks that keep coming back after resealing
- Sealant that came away because the surface wasn’t prepared
Remedial sealant in Northaw
The wrong product in the wrong joint won’t last, however tidy it looks. Out it comes, and in goes a sealant suited to the job. We work on mouldy bath & shower sealant, expansion joints and botched or over-sealed joints, and the jobs we see most are gaps opening along the back of the worktop and decorators’ caulk around a bath or shower.
In a village or hamlet like Northaw, homes are often older cottages and farmhouses alongside a few newer houses. Older walls and timber floors can move a little, and cracked grout and split sealant are often the first signs.
We stand behind the work with a 12-month guarantee, so you’re not left on your own once the job is done.
- Location
- Northaw (EN6)
- Region
- Hertfordshire
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Should I try it myself first?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
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.
The process
Every visit runs the same way: we look at the joints together, mask and protect the surrounding surfaces, carry out the job and tidy away. It usually takes a few hours, depending on how many layers have to come out. For a village or hamlet like Northaw, 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.
- We protect the surfaces around the joint.
- The botched or failed sealant is cut away completely.
- We clean and degrease the joint and look for signs of movement or water.
- New sealant goes in once the joint is dry, and is tooled smooth.
- You get the cure time and our view on why the joint failed.
Preparing for the visit
- Let us know about parking restrictions
- Keep children and pets away from the work area
- For business premises, tell us about site rules or sign-in
How to get a quote
Want a quote for remedial sealant? Please phone 0345 464 0079 or send us an email and tell us about the job. We will explain what we’d do and give you a clear price before any work starts.
Related advice
What affects the quote in Northaw
You’ll get a clear quote before work begins. It takes into account:
- Any working-time requirements on site
- Which sealant suits the joint
- How much old sealant there is and how hard it is to remove
- How much there is to do
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 to tell us for a quote
To help us quote quickly, let us know:
- The address or postcode of the job
- The rough size of the job
- Any access issues, like height or stairs
- A few photos by email, if you can
Quotes start with a quick conversation. Describe the problem, the location and the size of the job. When it suits you, call 0345 464 0079 or email us.
Northaw: your questions answered
I let a flat near Cuffley station. Can you help?
Yes, rental work is part of what we do. Just call 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear quote.
Is Northaw in your area for remedial sealant?
Yes. We work across London and the South East, and Northaw is part of that. You can ring 0345 464 0079 or email us and let us know what needs doing, and we’ll give you a clear quote.
Does remedial work come with a guarantee?
Yes. Our one-year guarantee covers the work, and we’re fully insured.
My shower still leaks after a reseal. Can you sort it?
Yes, usually. First we check whether the leak is the sealant at all, then the joints are stripped and resealed.
Where is Mr Mastic based?
We are a Crawley-based firm, with over 20 years’ experience. Our area covers South East England, London and Scotland.
Do you have insurance?
Yes. We are fully insured, and we’ve been doing sealant work for more than 20 years.
What do you put in the joint?
Products from Arbo and Everbuild, among others, picked for each joint. We explain the product when we quote.
Can I add another job to the visit?
Yes. More than one area can be quoted together.
For landlords and businesses
We work for landlords and letting agents as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order before the next move-in.
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.
How the job changes by surface
Over-sealed & botched joints
Every layer has to come out, and silicone residue is cleaned off the tiles too. Only a clean joint will take a new bead.
Leaking trays & enclosures
Where the joints are the problem, every bead is stripped and resealed with anti-fungal sanitary silicone, including the screen profile and tray edges.
What we can’t put right
Honest advice matters more to us than a booking, so here’s what new sealant will not do:
- Old mastic in a building from before 2000 that should be checked for asbestos before it’s disturbed
- Leaks from a shower valve, waste or pipework (a plumber’s job)
- Water damage behind tiles that needs a tiler
If in doubt, ring 0345 464 0079 or send us an email and we will say what we think.
Joints and surfaces we work on
- Failed movement joints
- Shrunken worktop sealant
- Botched or over-sealed joints
- Mouldy bath & shower sealant
- Expansion joints
- Leaking tray & enclosure joints
Leave it or put it right?
Mould under a bead cannot be reached by cleaning. The layers have to come out. In a small place like Northaw, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
The cost reflects the work involved, not a rough estimate. That’s why we ask about the job first and give you a clear price before work begins.
Why us?
- Trusted Arbo and Everbuild sealants
- We never seal over old sealant
- Homes, businesses and hotels
- White, clear, grey or another colour, product permitting
Read what affects the cost or our reviews.
Nearby places to Northaw
Also in Northaw
Remedial sealant in Northaw: local notes
Hard water is the norm across most of the South East, 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 Cuffley station? Then a joint that keeps failing is best fixed properly while the property is empty. For an older house near a landmark such as Parish Church of St Thomas A Becket, timber floors under older bathrooms flex, so joints need a sealant that moves with them. If you look after a building such as Northaw Church of England Primary School, 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.
Northaw is about 2 miles north-east of Potters Bar, in Hertfordshire. Our applicators cover remedial sealant for homes and businesses in Northaw and the surrounding area, as part of our work across Hertfordshire. We cover 381 towns and villages across Hertfordshire. For nearby work, see our London page, about 14 miles away.
We work across EN6 for remedial sealant and the streets around it. We cover properties on Vineyards Road, Church Lane and Northaw Road West. Nearby, we also carry out remedial sealant in Cuffley (1 mile east), Brookmans Park (2 miles north-west), Newgate Street (2 miles north-east), Bell Bar (2 miles north-west) and Little Berkhamsted (3 miles north). Larger places within reach include Watford (11 miles west), Hemel Hempstead (14 miles west), Stevenage (14 miles north), St Albans (8 miles west), Welwyn Garden City (7 miles north) and Harpenden (12 miles north-west).
Landmarks near Northaw
Around Northaw, our work takes us to homes and buildings near Two Brewers Public House and Mount Grace School, among other places. The nearest railway station is Cuffley station, roughly 1.6 miles east. Other landmarks nearby include Potters Bar Museum (2.1 miles west) and Chase Farm Hospital (3.3 miles south-east). Not far away are Fir and Pond Woods.