Surrey · England
Lightwater External Mastic
External mastic across Lightwater and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Movement joints filled with mortar instead of sealant
- Failed sealant between panels on a façade
- Rain getting behind render or cladding at a joint
External mastic in Lightwater, done properly
External mastic is a job where short cuts show quickly. New sealant over old, joints packed with mortar and beads with no backing all tend to fail early. We take the old material out and do it properly. Typical jobs include panel joints letting water in and movement joints with cracked, split or missing sealant, on copings & trims, brickwork movement joints and render & cladding joints.
Around Lightwater, garages, outbuildings and extensions all add to the joints on the outside of a home. Gutter ends, garage door frames and the joints where an extension meets the house are typical spots for leaks.
Your job is guaranteed for a year, as with all our work.
- Place
- Lightwater (GU18, GU19)
- Wider area
- Surrey
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What the job involves on each surface
Brickwork movement joints
Brick movement joints are often mistaken for a missing mortar line. Where one has been mortared, we cut it out and reseal it with sealant where it can be done safely.
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. We cut out the old sealant and reseal with a product suited to both surfaces.
Lightwater: your questions answered
Can you help a landlord with a rental near Bagshot station?
Yes. We work for landlords and agents as well as homeowners. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear quote.
Do you cover smaller places like Lightwater?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Do you have insurance?
Yes, we’re fully insured for every job we do.
Can you work on commercial sites?
Yes. We have worked for hotels, offices and other businesses and we’re fully insured.
Is it OK to seal over old sealant?
No. New silicone won’t bond to old silicone, and it traps any mould or water underneath. It all has to come out first.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. Our applicators cover Lightwater.
Do you remove the old sealant?
Always. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
What is backing rod for?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. That way it bonds to the two sides only and can stretch.
Walls and rooflines in Lightwater
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Homes close to All Saints include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain. If you look after a building such as Hammond School, larger buildings have long runs of movement joint that eventually need resealing.
Lightwater is about 3 miles east of Camberley, in Surrey. If you need external mastic in Lightwater, please call 0345 464 0079 or send us an email for a quick quote. We are based in Crawley and cover Surrey. Our area takes in 395 places across Surrey, large and small. We also work in Reading, around 15 miles away.
Jobs for external mastic in GU18 and GU19 works the same way as everywhere else we cover. You’ll find streets such as Ambleside Road, Ridgeway Close and Shrublands Drive, and we cover them all. If you are just outside Lightwater, we cover Donkey Town (1 mile south-east), Bagshot (1 mile north-west), Windlesham (1 mile north-east), Lucas Green (2 miles south-east) and West End (2 miles south-east). We also work in nearby towns such as Guildford (8 miles south-east), Woking (5 miles south-east), Camberley (3 miles west), Farnham (11 miles south-west), Egham (8 miles north-east) and Walton-on-Thames (12 miles east).
Landmarks near Lightwater
In Lightwater, that means homes and buildings near Gordon's School and Brentmoor Heath. Lightwater’s nearest station is Bagshot station, about 1.3 miles north-west of the centre. Well-known places in the area include Brookwood Hospital (3.3 miles south-east) and The Museum of The National Rifle Association (2.7 miles south). Green spaces nearby include Brookwood Lye.
Nearby places to Lightwater
Also in Lightwater
How to look after the new joints
Aftercare is simple:
- Fix overflowing gutters above sealed joints
- Avoid pressure-washing directly into sealant joints
- Make sure movement joints aren’t pointed over
- Tell anyone working on the walls about the movement joints
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
Leave a failed movement joint and water keeps getting into the wall. Over time it can mean damp inside, stained render or frost-damaged brick, all bigger jobs than a reseal.
When something else is needed
It helps to know what we can’t do too:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Cracking across the wall rather than at a joint
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
Not sure which it is? You can call 0345 464 0079 or drop us an email and we’ll tell you honestly.
Joints and surfaces we work on
- Brickwork movement joints
- Joints between brick and frames
- Façade panels
- Render & cladding joints
- Concrete & block
- Copings & trims
How the visit works
You do not need to clear the whole room or building, only the area right around the joints. Everything nearby is protected, and the job takes a few hours to a few days, depending on the length of joint and the access in most cases. In a smaller place like Lightwater, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- For indoor joints, keep the area dry beforehand if you can
- Let us know about stairs, lifts or work at height
- Move anything stored near the joints
Getting a quote
For a quote, phone 0345 464 0079 or drop us an email with the location and a short description of the problem. We will send you a clear quote before any work starts.
Related advice
Work for landlords, hotels and businesses
If you manage several properties in or around Lightwater, jobs at different addresses can be quoted together. Send us the addresses and the work at each, and pictures by email help.
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can be quoted together.
Why act early in Lightwater
A failed movement joint lets water into the wall. Resealing early keeps the job to the joint itself, instead of the wall and finishes around it. Around Lightwater, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
Doing several joints on one visit generally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. We will give you a clear price for the lot.
Why book with us
- Tidy, careful work
- Quality sealants from Arbo and Everbuild
- Every job guaranteed for a year
- Over 20 years’ experience
Read how sealant jobs are priced and our reviews.
When to call us in Lightwater
Sometimes a movement joint was filled with mortar or a rigid filler by mistake. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
Most people get in touch after spotting something like this:
- Leaking joints around cladding and façade panels
- Cracked joints where brick meets render or frames
- Hard, crazed mastic that has stopped moving
- Rigid filler in a joint that should flex
Rented homes near Bagshot station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
Comparing quotes
- What the cure time is
- How the joint is cleaned and prepared
- Is VAT in the price?
- What insurance they hold