Surrey · England
Alfold External Mastic
Sealing brickwork movement joints, render, cladding and façade joints in Alfold, with a 12-month guarantee on every job. Call for a quick quote.
- Rigid filler in a joint that should flex
- Failed seals between different materials
- Old sealant gone brittle and cracked
The process
Most of a good job is in the preparation, and we do not rush it. Joints are cleaned back and dried before anything new goes in. All told, the work takes a few hours to a few days, depending on the length of joint and the access. Somewhere like Alfold needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- First we look over the joints with you, agree which to renew and talk through access.
- We cut out the failed sealant and rake out any dirt or growth.
- We clean both faces of the joint and prime them where the product calls for it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Preparing for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Mention if the joints have been sealed before
- Mention any tricky access
Get a quote
For external mastic in Alfold, phone 0345 464 0079 or email us. Tell us what the problem is and where, and we will agree the price before any work begins.
Related advice
How we handle external mastic in Alfold
A movement joint is a deliberate break that lets a wall expand and contract. The sealant in it has to stretch and squeeze for years, and when it fails, the wall takes the strain and water finds a way in. Common call-outs are for movement joints filled with mortar instead of sealant and brick movement joints where the sealant has split, across concrete & block, brickwork movement joints and joints between brick and frames.
In a village or hamlet like Alfold, older cottages and farm buildings often stand in the open, where walls and rooflines take the weather head on. Gutter joints and wall joints there need a sealant that can flex and stay put.
Whatever the size of the job, it’s backed by our one-year guarantee.
- Where
- Alfold (GU6)
- Wider area
- Surrey
- Cover
- A year, on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. A few tips:
- Act on the first splits you see
- Ask before painting over external sealant
- Keep soil, plants and ivy away from the joints
- Keep movement joints as flexible joints, not mortar
Keep the joints clear of soil, plants and climbing growth. Anything that holds water against the joint wears it out sooner.
Leaks behind façade panels and render often go unseen. By the time there’s a damp patch, the damage can be well established.
Can I do it myself?
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
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.
Common problems we fix in Alfold
Some movement joints have been pointed up with mortar. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
These are the problems we are asked about most:
- Moss and dirt in joints with no sealant left
- Rigid filler in a joint that should flex
- Panel joints letting water in
- Gaps where render, brick and frames meet
For an older house near a landmark such as Church of St Nicholas, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Before booking anyone
- Is VAT in the price?
- How the colour is chosen
- Whether they seal over old material or remove it
- Whether the sealant suits the joint
What happens if it’s left?
Water gets in through a failed movement joint, behind render and cladding. Dealing with it early keeps the repair to the joint, rather than the wall around it. Where a wall is exposed, as many are in small places like Alfold, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you are not sure whether it needs doing, phone 0345 464 0079 or drop us an email for an honest opinion and a quote.
Why book with us
- An ARBOMaster approved applicator
- Full insurance on every job
- Over 20 years’ experience
- Sanitary silicone with an anti-fungal additive in wet areas
Questions from Alfold
Can you do external mastic in Alfold?
Yes, Alfold is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or send us an email and tell us what needs doing, and we’ll send you a clear quote.
Is Alfold within the area you cover?
Yes, we do. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
How long does external mastic last?
That depends on the wall, the weather and the movement. Signs to watch for are cracking, hardening and gaps at the edges and have them redone then.
Do you work for letting agents?
Yes, regularly. Several properties can go on one quote.
Is it OK to fill a movement joint with cement?
No. A mortar-filled joint can’t move, so the movement cracks the wall elsewhere. Use a flexible sealant with backing rod.
Can you seal over the old sealant?
No, because it fails. The old sealant always comes out first, so the new sealant bonds properly.
How do I get a quote for external mastic in Alfold?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote.
Will the new joint stand out?
The sealant colour is picked to suit the wall. There’s a wide choice of exterior colours.
What we can’t put right
We will always be straight with you, so here’s what sealant can’t fix:
- Render that’s blown, hollow or coming away
- Movement that is more than a sealant joint can take
- Walls that need new movement joints cut into them
If in doubt, phone 0345 464 0079 or send us an email and we’ll say what we think before you book.
What we seal
- Copings & trims
- Joints between brick and frames
- Façade panels
- Render & cladding joints
- Brickwork movement joints
- Concrete & block
Nearby places to Alfold
Also in Alfold
What affects the cost of external mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- When we can work, for business premises
- Access and height
- The product the joint needs
- How many areas need sealing
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
Asking for a quote
Photos by email are helpful but not essential. Try to tell us:
- Where the property is
- The problem you’ve noticed
- If it’s domestic, commercial or a hotel
- How many joints, rooms or windows are involved
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that is easy.
Alfold buildings and the weather
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
In and around Alfold, as anywhere, good external mastic starts with a clean, dry, properly prepared joint.
Alfold is about 9 miles west of Horsham, in Surrey. Wherever you are in the GU6 postcode area, we cover external mastic for homes and businesses. Alfold is one of 395 towns and villages in Surrey we cover. For nearby work, see our Crawley page.
We work across GU6 for external mastic and the streets around it. Streets in the area include Chapel Field Close, Loxwood Road and Cypress Grove, all of which we cover. Close by, we work in Alfold Bars (1 mile south), Loxwood (1 mile south), Ifold (2 miles south), Durfold Wood (3 miles west) and Plaistow (3 miles south-west). We also work in nearby towns such as Guildford (11 miles north), Woking (15 miles north), Farnham (14 miles north-west), Dorking (12 miles north-east), Haslemere (9 miles west) and Cranleigh (3 miles north-east).
Around Alfold
In Alfold, that means homes and buildings near The Crown pub and Fir Tree Copse. Open spaces near Alfold include Shillinglee Lake.