West Berkshire · England
Hamstead Marshall External Mastic
We cover Hamstead Marshall for sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly and a 12-month guarantee.
- Water getting into walls through failed joints
- Failed sealant between panels on a façade
- Sealant pulling away from one side of the joint
FAQs for Hamstead Marshall
Do you cover Hamstead Marshall for external mastic?
Yes, Hamstead Marshall is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or email us with a few details of the job, and we will send you a clear quote.
I let a flat near Kintbury station. Can you help?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or send us an email and tell us about the property, and we will send you a clear quote.
Can you seal over the old sealant?
No, it will not last. It may look fine at first, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
Are you insured?
Yes. Full insurance covers our work.
Is it messy?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
Are you ARBOMaster approved?
Yes. We are an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
Which products do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we will tell you what we’re using.
Can you quote for more than one area?
Of course. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
External mastic for homes and businesses in Hamstead Marshall
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible sealant bridges the two. If you’re dealing with sealant pulling away from one side of the joint and moss and dirt in joints with no sealant left, we can put it right, whatever the surface.
Somewhere as small as Hamstead Marshall, homes and farm buildings often face open ground, so walls and rooflines take the full force of wind and rain. Gutter joints and wall joints there need a sealant that can flex and stay put.
There’s a 12-month guarantee on every job, whatever its size.
- Location
- Hamstead Marshall (RG20)
- Region
- West Berkshire
- Guarantee
- 12 months on all our work
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What we do, step by step
All our tools and materials come with us in the van. After a quick look at the joints together, the area is protected and the work begins. It normally takes a few hours for a handful of joints, longer for a whole elevation. Somewhere as small as Hamstead Marshall, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, the joints are inspected and the access agreed.
- 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.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- Clear items away from the joints we’re working on
- Plan for the work area to be out of bounds to pets and children
- For indoor joints, keep the area dry beforehand if you can
Get a quote
We do not publish a price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To arrange one, phone 0345 464 0079 or email us.
Related advice
Nearby places to Hamstead Marshall
What else we do in Hamstead Marshall
What we cannot put right
We’ll always be straight with you, so here’s what new sealant will not do:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Cracks in the bricks or render themselves, away from the joints
- Movement that is more than a sealant joint can take
If you are not sure, just call 0345 464 0079 or send us an email and we will give you a straight answer.
Surfaces we seal
- Façade panels
- Concrete & block
- Render & cladding joints
- Brickwork movement joints
- Copings & trims
- Joints between brick and frames
How we quote for external mastic
We don’t publish a price list, because jobs vary so much. The quote depends on:
- Whether old sealant or filler has to be cut out
- Whether there’s mould to deal with
- The number of rooms or windows
- The product the joint needs
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we will go through it with you.
What we need to know
You don’t need to know the technical terms. It helps if you can tell us:
- The type of property
- Photos by email, if that’s easy
- What the problem is, such as mould, gaps, leaks or cracking
- The address or postcode of the job
Need a quote? Please phone 0345 464 0079 or email us and tell us about the job. We’ll explain what we’d do and give you a clear quote before we start.
Why deal with it now?
Pointing a movement joint with mortar might seem a neat fix, but it stops the joint moving. The wall then cracks somewhere else. The correct repair is a flexible sealant with the right backing. Older cottages and farmhouses around Hamstead Marshall can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference, and we’ll explain the quote if you ask.
What you get with us
- Any old sealant cut out fully, not covered over
- Quality sealants from Arbo and Everbuild
- 180+ five-star Google reviews
- One-year guarantee on every job
See what affects the cost or our reviews.
Signs you need external mastic in Hamstead Marshall
Buildings move more than people expect. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. All of that ends up in the joint sealant.
Any of these means the joints need attention:
- Moss and dirt in joints with no sealant left
- Failed seals between different materials
- Movement joints with cracked, split or missing sealant
- Hard, crazed mastic that has stopped moving
Homes close to Church of St Mary include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant.
Questions to ask before you book
- Whether they’re fully insured
- Whether VAT is included
- What guarantee comes with the work
- How the surfaces are prepared before sealing
DIY versus a professional finish
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
How the job changes by surface
Render joints
The face of render can be soft, so a low-modulus sealant is kinder to the joint edges. Priming is done where the sealant calls for it.
Concrete and blockwork
Big joints in concrete need careful depth control. Backing rod sized to the joint sets it.
Walls and rooflines in Hamstead Marshall
With historic houses such as Benham Park (about 2.1 miles north-east) nearby, there’s older building stock in the area around Hamstead Marshall as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For landlords with property near Kintbury station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. If you look after a building such as Enborne C.E. Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Hamstead Marshall is about 3 miles west of Newbury, in West Berkshire. Hamstead Marshall gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our area takes in 155 places across West Berkshire, large and small. You can also see our page for Reading, roughly 19 miles from Hamstead Marshall.
Postcode districts we cover here for external mastic: RG20. We cover properties on Holtwood Road and Ash Tree Grove. Nearby, we also carry out external mastic in Crockham Heath (1 mile east), Ball Hill (1 mile south), Enborne (1 mile east), Skinners Green (2 miles east) and Enborne Row (2 miles south-east). Larger places within reach include Newbury (3 miles east), Thatcham (6 miles east), Burghfield Common (15 miles east), Speenhamland (4 miles north-east), Hungerford (6 miles west) and Lambourn (10 miles north-west).
Around Hamstead Marshall
Locally, jobs take us to homes and businesses close to The White Hart pub, Park House School and Hamstead Marshall Park and the streets around them. Hamstead Marshall’s nearest station is Kintbury station, about 2.4 miles north-west. Well-known places in the area include Newbury Castle (1.1 miles north) and West Berkshire Community Hospital (4.8 miles east). The countryside around Hamstead Marshall includes Pilot Hill and Kintbury Newt Ponds.