Kent · England
External & façade joints in St Lawrence, Kent
Problem with your movement joints in St Lawrence? We cut out the old, prepare the joints and apply the right sealant, with a 12-month guarantee.
- Brick movement joints where the sealant has split
- Hard, crazed mastic that has stopped moving
- Failed seals between different materials
Aftercare tips
Simple care keeps the joints in good condition. Our advice:
- Don’t let climbing plants root in the sealant
- Get split or bare joints resealed while the damage is small
- Check the sealant is paintable before painting near it
- Keep high-pressure jets off the joints
Only paint over the joint if we have confirmed the sealant can take paint. Paint can crack on a flexible joint.
An open movement joint lets rain into the wall every time it pours. That can lead to damp patches, staining and frost damage, all bigger jobs than a reseal.
How we handle external mastic in St Lawrence
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Porous or awkward surfaces are primed where the sealant needs it, and we do not skip that step. We work on joints between brick and frames, concrete & block and copings & trims, and the jobs we see most are joints with sealant missing in places and weathered mastic that no longer stretches.
Around St Lawrence, garages, outbuildings and extensions all add to the joints on the outside of a home. Leaks usually start at a gutter end, a garage door frame or where an extension meets the house.
Whatever the size of the job, you get the same one-year guarantee.
- Where
- St Lawrence (CT11, CT12)
- Region
- Kent
- Cover
- A year, on every job
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
External mastic in St Lawrence: local notes
St Lawrence is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For landlords with property near Ramsgate station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. Homes close to Church of St Laurence include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant. For site and facilities teams at buildings such as Ellington Infant School, larger buildings have long runs of movement joint that eventually need resealing.
St Lawrence is about 1 mile west of Ramsgate, in Kent. From the centre of St Lawrence to the outskirts, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. St Lawrence is one of 922 towns and villages in Kent we cover for external mastic. Our Chelmsford page covers work nearby.
Here we cover the CT11 and CT12 postcode area for external mastic. Streets in the area include Park Road, Saxon Road and Downs Road. Main roads around St Lawrence include the A255. Nearby, we also carry out external mastic in Ramsgate (1 mile east), Northwood (1 mile north), Upton (2 miles north-east), St Peter's (2 miles north) and Broadstairs (2 miles north-east). We also work in nearby towns such as Canterbury (14 miles west), Margate (3 miles north), Dover (14 miles south), Deal (8 miles south), Herne Bay (12 miles west) and Tower Hamlets (15 miles south).
What’s near St Lawrence
In St Lawrence, that means homes and buildings near Chatham House Grammar School, Churchill House School With Railed Area and The Admiral Fox pub and the streets around them. There’s a railway station in St Lawrence itself: Ramsgate station. Nearby you will also find Westwood Cross (1.5 miles north) and Ramsgate General Hospital (0.6 miles south-east). Not far away are Sandwich and Pegwell Bay.
Should I try it myself first?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
What the job involves on each surface
Concrete and blockwork
Big joints in concrete need careful depth control. We size the backing rod to the gap and keep the sealant to the right depth.
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. The old joint is removed and a sealant that bonds to both sides goes in.
What we do, step by step
Most of a good job is in the preparation, and we do not rush it. Every joint is cleaned and dried before new material goes in. In total, it generally takes a few hours to a few days, depending on the length of joint and the access. For a job in St Lawrence, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- Keep pets and children clear of the area while we work
- Try not to wet indoor joints just before the visit
- Mention any parking rules near the property
Ask for a quote
We quote each job on its own, so the first step is telling us about yours. Simply ring 0345 464 0079 or email us and describe the job and send photos if you have them.
Related advice
Also near St Lawrence
More services for St Lawrence
For landlords and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. We can quote for more than one property at once.
If you manage several properties in or around St Lawrence, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
Why it’s worth doing now in St Lawrence
A failed movement joint lets water into the wall, behind render and cladding. Dealing with it early keeps the repair to the joint, rather than the wall around it. In a smaller place like St Lawrence, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part.
What you get with us
- 20+ years of sealant experience
- Homes, businesses and hotels
- Any old sealant cut out fully, not covered over
- We leave the area clean and tidy
See what affects the cost or our reviews.
How we quote for external mastic
The quote reflects the job in front of us. We take into account:
- How easy the joints are to reach
- Any mould that needs treating
- When we can work, for business premises
- The old material and how stubborn it is
The cost reflects the work involved, not guesswork. That’s why we ask a few questions first and give you a clear price before any work starts.
What we need to know
When you call or email, it’s useful to know:
- Access, such as stairs, a lift or height
- If someone has resealed it before
- Photos by email, if that is easy
- The address or postcode of the job
We do not publish a price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To arrange one, call 0345 464 0079 or email us.
St Lawrence questions
I let a flat near Ramsgate station. Can you help?
Yes, we work for landlords and letting agents. Just call 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear quote.
Is St Lawrence within the area you cover?
Yes. St Lawrence is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can a movement joint be filled with mortar?
No. A mortar-filled joint can’t move, so the movement cracks the wall elsewhere. It needs a flexible sealant over backing rod.
Will it make a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We explain the product when we quote.
Can you seal joints between two different materials?
Yes. We cut out the old sealant, prepare both faces and reseal with a flexible exterior product. We pick a colour that works with both materials.
Is there a guarantee?
Yes. Each job is guaranteed for twelve months.
How long does external mastic last?
It varies with how exposed the wall is and how much the joint moves. Look for splits, hardening or edges coming away, and reseal at that point.