Surrey · England
Hammer Bottom External Mastic
Movement joints in Hammer Bottom need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Rigid filler in a joint that should flex
- Gaps where render, brick and frames meet
- Movement joints with cracked, split or missing sealant
External mastic in Hammer Bottom, done properly
On houses, flats and commercial buildings across Hammer Bottom, we reseal joints in brickwork, render, cladding and façade panels. The preparation is the same whatever the wall: clean, sound faces and a controlled depth. Typical jobs include old sealant gone brittle and cracked and leaking joints around cladding and façade panels, across brickwork movement joints, joints between brick and frames and concrete & block.
Outside joints can only be sealed when they’re dry, so work in Hammer Bottom is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
A 12-month guarantee comes as standard, so you are covered after we have gone.
- Place
- Hammer Bottom (GU27, GU30)
- Wider area
- Surrey
- Guarantee
- A year, on every job
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What sealant work cannot fix
To be straight with you, there are a few things sealant will not fix:
- Loose or hollow render, which needs re-rendering
- Movement that’s more than a sealant joint can take
- Cracked brickwork or render that needs a builder or plasterer
If in doubt, call 0345 464 0079 or email us and we will say what we think.
What we seal
- Copings & trims
- Concrete & block
- Brickwork movement joints
- Render & cladding joints
- Façade panels
- Joints between brick and frames
Keeping the joints in good condition
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Show decorators and builders where the movement joints are
- Deal with leaking gutters that soak the joints below
- Do not let climbing plants root in the sealant
- Never let anyone fill a movement joint with mortar
Make sure anyone working on the wall later knows where the movement joints are. They should be kept open and resealed, not filled.
Act while the splits are small. At that stage it’s a simple cut out and reseal.
Different surfaces, different methods
Render joints
Rendered walls have joints at beads, openings and changes of material. We reseal them with a flexible exterior sealant that suits the render colour.
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. The old joint is removed and a sealant that bonds to both sides goes in.
Can I do it myself?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
What external mastic looks like in Hammer Bottom
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.
Rented homes near Haslemere station change hands often, and split movement joints are easy to miss on a rental until damp shows inside. If you look after a building such as Woolmer Hill School, its movement joints, gutters and trims need looking after like any other building’s.
Hammer Bottom is about 9 miles south of Farnham, in Surrey. Homes, rented property, offices and hotels in Hammer Bottom is covered for external mastic. The work is guaranteed for a year. Across Surrey, we cover 395 places, and Hammer Bottom is one of them. There’s also a page for Portsmouth, roughly 24 miles from Hammer Bottom.
Work in GU27 and GU30 is quoted and booked the same way as anywhere else. Local streets include Hammer Vale, Sandy Lane and Hewshott Lane, all of which we cover. Other places close to Hammer Bottom include Hammer (1 mile east), Woolmer Hill (1 mile south-east), Bramshott Chase (1 mile north), Linchmere (1 mile south) and Shottermill (1 mile east). Larger places within reach include Guildford (14 miles north-east), Farnham (9 miles north), Cranleigh (13 miles east), Ash (11 miles north), Godalming (9 miles north-east) and Farncombe (10 miles north-east).
Around Hammer Bottom
Locally, jobs take us to homes and businesses close to The Prince of Wales pub and Camelsdale Primary School. The nearest railway station is Haslemere station, about 1.9 miles east. Other landmarks nearby include Haslemere and District Hospital (2.4 miles east). For a walk, there’s Wheeler's Down and Lynchmere Commons.
Also near Hammer Bottom
Also in Hammer Bottom
Common questions in Hammer Bottom
Is Hammer Bottom within the area you cover?
Yes. Hammer Bottom 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 you help a landlord with a rental near Haslemere station?
Yes, we work for landlords and letting agents. Just phone 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear quote.
Why do you put foam in the joint first?
That’s backing rod, a closed-cell foam. It keeps the sealant at the right depth and bonded to the sides only.
When will the joints need doing again?
It varies with how exposed the wall is and how much the joint moves. Look for splits, hardening or edges coming away.
How long does external mastic take?
A typical job takes a few hours to a few days, depending on the length of joint and the access, including the preparation. Your quote will say how long we expect yours to take.
Can you seal joints between two different materials?
Yes. Joints between dissimilar materials are a big part of external work. The sealant is chosen to bond to both sides with primer where required.
Is it OK to fill a movement joint with cement?
No. A mortar-filled joint cannot move, so the wall cracks somewhere else instead. Use a flexible sealant with backing rod.
Do you work for hotels and businesses?
Yes, regularly. We can plan bigger jobs in stages.
How it works
Most of a good job is in the preparation, so that is where we spend the time. Every joint is cleaned and dried before new material goes in. In total, it usually takes anything from a few hours to several days, depending on the building. In a small place like Hammer Bottom, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- Old sealant and any debris are cut and raked out.
- The joint faces are cleaned and primed where the sealant needs it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Getting ready for the visit
- On commercial sites, let us know about site rules
- Mention any leaks or damp you’ve noticed
- Clear items away from the joints we’re working on
Ask for a quote
Getting a quote is simple: let us know the job and the location. Photos by email help us understand the job.
Read more
Signs you need external mastic in Hammer Bottom
Sunlight, wet weather and frost wear exterior sealant down. Over the years it hardens, cracks on the surface and loses its give, so the next time the wall moves, it splits or pulls away.
Most people get in touch when they notice something like this:
- Joints where the bead has come unstuck
- Joints with sealant missing in places
- Weathered mastic that no longer stretches
- Joints pointed up with cement by mistake
If you live in an older home near The Parish Church of St Peter, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Comparing quotes
- What the cure time is
- What insurance they hold
- Whether all the old sealant comes out first
- What product goes in the joint
For landlords and businesses
In hotels, rooms out of use cost money, so the work can be planned room by room. We have worked in hotels as well as homes and businesses.
If you manage several properties in or around Hammer Bottom, jobs at different addresses can be quoted together. Send us the addresses and the work at each, and photos by email help.