West Berkshire · England
External Mastic in Three Mile Cross
External mastic in Three Mile Cross from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Weathered mastic that no longer stretches
- Joints pointed up with cement by mistake
- Panel joints letting water in
External mastic in Three Mile Cross
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, so once it splits or hardens, the joint stops working and water gets in. We work on brickwork movement joints, concrete & block and copings & trims, and common reasons people get in touch are hard, crazed mastic that has stopped moving and rain getting behind render or cladding at a joint.
In a village or hamlet like Three Mile Cross, older cottages and farm buildings often stand in the open, 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.
Whatever the size of the job, you get the same one-year guarantee.
- Where
- Three Mile Cross (RG7)
- Wider area
- West Berkshire
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
How to look after the new joints
Joint life depends on how it’s used and looked after. We suggest:
- Look over the joints every year, ideally after winter
- Fix overflowing gutters above sealed joints
- Check the sealant is paintable before painting near it
- Point out the joints to other trades
Have a quick look at the joints each spring. Splits, gaps at the edges or plants in the joint are early warning signs.
Act while the splits are small. Then it’s a straightforward cut-out and reseal with no damage behind it to deal with.
Three Mile Cross buildings and the weather
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Stratfield Saye House (about 4 miles south) are a reminder that the area around Three Mile Cross has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
Homes close to St Michael and All Angels include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant.
Three Mile Cross is about 3 miles south of Reading, in West Berkshire. Homes, rented property, offices and hotels in Three Mile Cross is covered for external mastic, old or new, large or small. Every job comes with our one-year guarantee. 155 places in West Berkshire are on our list, from the larger towns to small villages.
Postcode districts we cover here for external mastic: RG7. You’ll find streets such as Dairy Grove, Basingstoke Road and Buttermilk Grove, all of which we cover. Neighbouring places we cover for external mastic include Ryeish Green (1 mile south-east), Great Lea Common (1 mile north-west), Whitley Wood (1 mile north-east), Shinfield (1 mile east) and Green Park (2 miles north-west). We also work in nearby towns such as Newbury (15 miles west), Thatcham (12 miles west), Burghfield Common (4 miles west), Speenhamland (15 miles west), Calcot (4 miles north-west) and Shaw (15 miles west).
Local landmarks in Three Mile Cross
Typical jobs here are in homes near The Farriers Arms, Pearman's Copse and Ryeish Green School and the streets around them. For rail, the closest station is Reading Green Park station, roughly 2 miles north-west. Nearby you’ll also find Beaumys Castle (2.1 miles south) and The Oracle (3.3 miles north). For a walk, there’s Longwater and Fobney Island Wetland Reserve.
Should I try it myself first?
If you’ve already had a go yourself, that is fine. We cut it out and start again, so just mention it when you contact us.
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Common questions in Three Mile Cross
Is Three Mile Cross in your area for external mastic?
Yes, Three Mile Cross is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or email us with a few details of the job.
I let a flat near Reading Green Park station. Can you help?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear price.
Is there a guarantee?
Yes, for a year. If there’s a problem with our work in that time, tell us and we will put it right.
Will the new joint stand out?
We choose a sealant colour to suit the brick, stone or render. There’s a wide choice of exterior colours.
Can a movement joint be filled with mortar?
No. A mortar-filled joint cannot move, so the movement cracks the wall elsewhere. Use a flexible sealant with backing rod.
Do the sealants smell?
That depends on the sealant. Some products have a noticeable smell, others very little, and any smell fades as they cure.
What does external mastic cost?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
What we can’t put right
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Failed render or damaged cladding panels
- Subsidence or other structural problems
- Rising or penetrating damp from elsewhere in the wall
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly.
What we seal
- Render & cladding joints
- Copings & trims
- Joints between brick and frames
- Façade panels
- Concrete & block
- Brickwork movement joints
The process
When we arrive, we start by going over the job with you, so there are no surprises. Surfaces next to the work are protected before any work starts. Most jobs take a few hours to a few days, depending on the length of joint and the access. For a village or hamlet like Three Mile Cross, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- Old sealant and any debris are cut and raked out.
- Both sides are cleaned back to sound material and primed if needed.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
How to prepare
- Let us know about stairs, lifts or work at height
- Mention any parking rules near the property
- Try not to wet indoor joints just before the visit
Ask for a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.
Related advice
Nearby places to Three Mile Cross
Also in Three Mile Cross
What we’re called out for in Three Mile Cross
Poor preparation causes many early failures: dusty or wet faces, no primer where one was needed, or old sealant left in. The sealant never bonds properly.
Most people get in touch after spotting something like this:
- Plants rooting in failed movement joints
- Panel joints letting water in
- Hard, crazed mastic that has stopped moving
- Rain getting behind render or cladding at a joint
Letting a property close to Reading Green Park station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Questions to ask before you book
- What the quote includes, VAT included or not
- What happens if they find a problem under the old sealant
- What product goes in the joint
- How the joint is cleaned and prepared
Why act early in Three Mile Cross
A failed movement joint lets water into the wall and can run behind render or cladding. Dealing with it early keeps the repair to the joint, instead of the wall and finishes around it. Where a wall is exposed, as many are in small places like Three Mile Cross, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. You’ll know the price before we begin.
Why book with us
- Anti-fungal sanitary silicone in wet areas
- Arbo and Everbuild products
- Colour picked to suit the job
- Experience in homes, commercial sites and hotels
Read what affects the cost or customer reviews.
Landlord and commercial work in Three Mile Cross
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.
If you manage several properties in or around Three Mile Cross, several properties can go on one quote. Just tell us the addresses and what each one needs, and photos by email help.