West Berkshire · England
Mortimer External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Mortimer and across West Berkshire. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Joints with sealant missing in places
- Weeds or debris growing in open joints
- Sealant pulling away from one side of the joint
What happens on the day
A visit follows a simple pattern: we look at the joints together, mask and protect the surrounding surfaces, do the work and clear up. Most jobs take a few hours to a few days, depending on the length of joint and the access. Parking around Mortimer is generally easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- 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.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Preparing for the visit
- Tell us about any water getting in
- Try not to wet indoor joints just before the visit
- Keep children and pets away from the work area
Get a quote
Need a quote? Please call 0345 464 0079 or email us with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
Related advice
How we handle external mastic in Mortimer
Ground-floor and low-level joints are straightforward to reach. Where joints are higher up, tell us about the building when you get in touch and we will confirm what’s needed to reach them safely. If you have joints where the bead has come unstuck and damp patches traced to an open external joint, we can help, on render & cladding joints, brickwork movement joints and copings & trims alike.
Around Mortimer, 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.
Every job comes with a one-year guarantee.
- Where
- Mortimer (RG7)
- Region
- West Berkshire
- Cover
- One year on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Also near Mortimer
Other services in Mortimer
What we cannot put right
We won’t take on work that won’t last, so these are the limits:
- Adding movement joints to masonry that has none
- Render that’s blown, hollow or coming away
- Damp that isn’t coming from the joint
If in doubt, ring 0345 464 0079 or email us and we will say what we think.
What we seal
- Façade panels
- Copings & trims
- Concrete & block
- Brickwork movement joints
- Render & cladding joints
- Joints between brick and frames
FAQs for Mortimer
Is Mortimer in your area for external mastic?
Yes, Mortimer is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or email us and tell us what needs doing, and we’ll give you a clear price.
Do you work for landlords with property near Mortimer station?
Yes. We work for landlords and agents as well as householders. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear quote.
How much does external mastic cost in Mortimer?
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 any work starts.
Is it worth trying it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
How long does the job take?
As a guide, most jobs take a few hours for a handful of joints, longer for a whole elevation. Larger jobs naturally take longer, and we’ll say how long yours will take.
What do you put in the joint?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice.
Can I add another job to the visit?
Yes. Several rooms, windows or areas can go on one quote.
How long does external mastic last?
It varies from wall to wall: joints on exposed walls or with a lot of movement age sooner. Check them each year and reseal when they split or harden. Our work comes with a 12-month guarantee.
What external mastic looks like in Mortimer
With historic houses such as Stratfield Saye House (about 3.6 miles south-east) nearby, there’s older building stock in the area around Mortimer as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. 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.
Letting a property close to Mortimer station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies. Homes close to Mortimer Methodist Church include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move.
Mortimer is about 4 miles north-east of Tadley, in West Berkshire. Every kind of property in Mortimer is covered for external mastic, old or new, large or small. Every job comes with our one-year guarantee. We cover 155 towns and villages across West Berkshire, from the larger towns to small villages. You can also see our page for Reading, about 6 miles away.
All of RG7 is covered for external mastic, from the main roads to the quietest streets. External mastic is available to properties on The Street, Croft Road and Leigh Field. Nearby, we also carry out external mastic in Stratfield Mortimer (1 mile east), Mortimer West End (1 mile south-west), Goddard's Green (2 miles north-east), Burghfield Common (2 miles north) and Wokefield (2 miles north-east). Further out, we also cover Newbury (11 miles west), Thatcham (8 miles west), Speenhamland (11 miles west), Spencers Wood (4 miles east), Calcot (5 miles north) and Shaw (11 miles west).
Around Mortimer
We work in homes and buildings around The Willink School, The Willink School and Padworth Common Local Nature Reserve. Mortimer’s nearest station is Mortimer station, about 1.4 miles east of the centre. Nearby you’ll also find Calleva Museum (2 miles south-west) and Beaumys Castle (3.7 miles east). For a walk, there’s Hosehill Lake.
Common problems we fix in Mortimer
The wrong product in a moving joint is a classic cause. A stiff, general-purpose sealant can’t cope with a joint that moves a lot, so it pulls away from the edges.
Look out for any of the following:
- Old sealant gone brittle and cracked
- Movement joints with cracked, split or missing sealant
- Rigid filler in a joint that should flex
- Gaps where render, brick and frames meet
If you look after a building such as Mortimer St John's C.E. Infant School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Before you book anyone
- How long the guarantee is
- Is VAT in the price?
- Whether all the old sealant comes out first
- What happens if the job turns out different
What happens if it’s left?
An open joint keeps letting water into the wall with every downpour. Wet masonry is more easily damaged by frost near the open joint, so the problem grows beyond the joint itself. Homes in smaller places like Mortimer can face more weather, and failed outside joints let damp into walls. Inside, a split seal lets water into floors and panels just as it would anywhere.
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
Why us?
- An ARBOMaster approved applicator
- Full insurance on every job
- Homes, businesses and hotels
- Sealant colour chosen to suit
Read how sealant jobs are priced or our reviews.
Landlord and commercial work in Mortimer
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll quote.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
Should I try it myself first?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
What affects the quote in Mortimer
Every job gets its own quote. This is what makes a difference:
- Whether there’s mould to deal with
- How much old sealant there is and how hard it is to remove
- The number of rooms or windows
- Working hours on commercial sites
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we will explain what it covers.
Helping us quote
Photos help, but a description is a good start. Try to tell us:
- The type of property
- Access, such as stairs, a lift or height
- Where the job is, and your postcode
- Photos by email, if that’s easy
Getting a quote is simple: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job, and we’ll come back to you with a quote.