Surrey · England
Runfold External Mastic
Specialist external mastic for Runfold: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Hard, crazed mastic that has stopped moving
- Weeds or debris growing in open joints
- Gaps where render, brick and frames meet
Your questions about external mastic in Runfold
Will you come out to Runfold?
Yes. Runfold 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.
I let a flat near Farnham station. Can you help?
Yes. We work for landlords and agents as well as homeowners, and several properties can go on one quote. You can ring 0345 464 0079 or email us with the details for a clear quote.
Do you use backing rod?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. Then the sealant bonds to two faces and can move.
What sealant do you use?
Each joint gets the product that suits it. Movement, water and weather all affect the choice.
How much does external mastic cost in Runfold?
We don’t publish prices, because the cost depends on the job: its size, the old material, access and the product needed. You will get a clear quote before work begins.
What is a movement joint?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It should be filled with flexible sealant, never mortar.
Does someone need to be in?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
Do you do commercial work?
Yes. We’ve worked for hotels, offices and other businesses.
External mastic for homes and businesses in Runfold
On houses, flats and commercial buildings across Runfold, we reseal joints in brickwork, render, cladding and façade panels. The preparation is the same whatever the wall: clean joint faces and the right depth. If you are dealing with movement joints filled with mortar instead of sealant and weathered mastic that no longer stretches, we can put it right, on copings & trims, joints between brick and frames and brickwork movement joints alike.
In a village or hamlet like Runfold, older cottages and farm buildings often stand in the open, so walls and rooflines take the full force of wind and rain. Joints on those walls need a sealant that moves with the building and stays in place.
Whatever the size of the job, it’s backed by our one-year guarantee in Runfold and across Surrey.
- Location
- Runfold (GU10, GU9)
- Wider area
- Surrey
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What happens on the day
There’s no need to move everything out before we come, only the area right around the joints. Everything nearby is protected, and the work takes anything from a few hours to several days, depending on the building in most cases. For a village or hamlet like Runfold, 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.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- We cut out the failed sealant and rake out any dirt or growth.
- The joint faces are cleaned and primed where the sealant needs it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
How to prepare
- Tell us about access, such as stairs, a lift or high-level joints
- Where the joints are inside, avoid wetting them before we arrive
- For business premises, tell us about site rules or sign-in
Ask for a quote
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we’ll talk you through the work and give you a clear quote.
Advice
Signs you need external mastic in Runfold
The wrong product in a moving joint is a classic cause. A high-modulus or general-purpose sealant can be too rigid for a busy joint, and it tears off the sides.
If you can see any of these, it’s time to have the joints looked at:
- Panel joints letting water in
- Weeds or debris growing in open joints
- Weathered mastic that no longer stretches
- Sealant that has lost its bond to the brick or render
For site and facilities teams at buildings such as South Farnham School, larger buildings have long runs of movement joint that eventually need resealing.
Before you book anyone
- Is the old sealant removed completely?
- How much experience the applicator has
- What product goes in the joint
- Are they insured?
Leave it or put it right?
Done well, a resealed joint is a neat, straight line that suits the wall. A rushed bead with no backing looks untidy and does not last. Around Runfold, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
We don’t show prices on the website, because each job is priced on what it involves. Call for a quick quote and we’ll talk you through it.
Why us?
- Fully insured
- One-year guarantee on every job
- Old sealant always removed completely
- 4.9 on Google from 180+ five-star reviews
Read our cost guide and what customers say.
How to look after the new joints
Good habits help new joints last longer. A few tips:
- Deal with leaking gutters that soak the joints below
- Look over the joints every year, ideally after winter
- Keep soil, plants and ivy away from the joints
- Check the sealant is paintable before painting near it
Do not paint over the new sealant unless we have said the product is paintable. Many exterior sealants aren’t designed to be painted.
Once a joint can’t move, the wall finds another way, often as cracks near the joint. Resealing it early helps prevent that.
How the job changes by surface
Concrete and blockwork
Concrete faces can be dusty and porous, so preparation is key. A primer goes on where the product requires one.
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. The movement joint takes that up, so the sealant in it must stay soft and stretchy.
Runfold buildings and the weather
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Farnham Castle (about 2.2 miles west) are a reminder that the area around Runfold has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
If you live in an older home near The Church of the Good Shepherd, an extension built onto an older house moves differently, and the joint between them takes the strain. If you let a flat or house near Farnham station, outside joints that have cracked can let damp into a rental, so check them between lets.
Runfold is about 2 miles east of Farnham, in Surrey. Our applicators cover external mastic for homeowners, landlords and businesses in Runfold. Our Surrey coverage runs to 395 places, Runfold among them. Reading is on our list too, about 19 miles from Runfold.
Jobs for external mastic in GU10 and GU9 works the same way as everywhere else we cover. If you need external mastic at a property on Greenacres, Crooksbury Road and Compton Way or a nearby road, we can help. Close by, we work in Compton (1 mile west), The Sands (1 mile east), Sandy Cross (1 mile north-east), Badshot Lea (1 mile north) and Seale (2 miles north-east). Larger places within reach include Guildford (8 miles east), Woking (11 miles north-east), Camberley (9 miles north), Frimley (7 miles north), Haslemere (9 miles south) and Cranleigh (13 miles east).
What’s near Runfold
We work in homes and buildings around Crooksbury Hill. For rail, the closest station is Farnham station, about 1.7 miles west. Nearby you will also find Farnham Castle (2.2 miles west) and Museum of Farnham (2.2 miles west). For a walk, there’s Culverswell Hill and Aunt's Pool.
Also near Runfold
Other services in Runfold
Work for landlords, hotels and businesses
If you manage several properties in or around Runfold, jobs at different addresses can go on one quote. Send us the addresses and the work at each.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
DIY sealant or a professional job?
If you’ve already had a go yourself, that’s fine. We cut it out and start again.
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.