Reading · England
External Mastic in Gallowstree Common
External mastic in Gallowstree Common from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Old sealant gone brittle and cracked
- Water getting into walls through failed joints
- Movement joints filled with mortar instead of sealant
Outside joints around Gallowstree Common
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. Historic houses like Mapledurham House (about 2.6 miles south-west) are a reminder that the area around Gallowstree Common has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
If you let a flat or house near Tilehurst station, outside joints that have cracked can let damp into a rental, so check them between lets.
Gallowstree Common is about 3 miles north-west of Caversham, in Reading. From the centre of Gallowstree Common to the outskirts, external mastic is available for homes and businesses alike. Gallowstree Common is one of 34 towns and villages in Reading where we work for external mastic.
We work across the RG4 postcode area for external mastic and the streets around it. External mastic is available to properties on Reades Lane, Hearns Lane and Horsepond Road and the roads around them. We also cover Cane End (1 mile south-west), Hook End (2 miles north-west), Stoke Row (2 miles north), Checkendon (3 miles north-west) and Woodcote (3 miles west). Further out, we also cover Caversham (3 miles south-east), Norcot (4 miles south), West Reading (4 miles south), Tilehurst Within (4 miles south), Shinfield (8 miles south) and Arborfield Garrison (10 miles south-east).
Around Gallowstree Common
We work in homes and buildings around The Reformation pub, Kidmore End Church of England Primary School and The Warwick School, among other places. Gallowstree Common’s nearest station is Tilehurst station, roughly 3.3 miles south of the centre. Well-known places in the area include Battle Hospital (4.1 miles south). Open spaces near Gallowstree Common include Hartslock.
How we handle external mastic in Gallowstree Common
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible sealant bridges the two where mortar or filler would crack. We’re often asked to deal with panel joints letting water in and joints with sealant missing in places, on joints between brick and frames, copings & trims and brickwork movement joints.
External sealant needs dry, clean surfaces, so work around Gallowstree Common is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
Our work is backed for twelve months, in Gallowstree Common and everywhere else we cover.
- Where
- Gallowstree Common (RG4)
- Region
- Reading
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Towns and villages near Gallowstree Common
Also in Gallowstree Common
Common problems we fix in Gallowstree Common
Every building moves. 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.
It’s worth asking for a quote if you see:
- Movement joints filled with mortar instead of sealant
- Failed seals between different materials
- Old sealant gone brittle and cracked
- Moss and dirt in joints with no sealant left
In the older streets around Church of St John the Baptist, older walls, gutters and the joints where extensions meet them need a flexible sealant.
What your quote should include
- How hidden problems are handled
- Whether they seal over old material or remove it
- Which colour the sealant will be
- Whether they’re fully insured
Why act early in Gallowstree Common
An open joint keeps letting water into the wall with every downpour. In cold weather, frost can damage wet brick and render, so the damage spreads beyond the joint. Older cottages and farmhouses around Gallowstree Common can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
We do not show prices on the website, because the cost depends so much on the job itself. Call for a quick quote and we’ll talk you through it.
Why book with us
- Domestic, commercial and hotel work
- We agree the colour with you first
- An ARBOMaster approved applicator
- Any old sealant cut out fully, not covered over
See what affects the cost or our reviews.
What affects the quote in Gallowstree Common
There’s no set price list, because no two jobs are the same. What we look at:
- Whether the work is at height
- Working hours on commercial sites
- Which sealant suits the joint
- Whether old sealant or filler has to be cut out
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. The price is agreed before we begin.
Asking for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- What the problem is, such as mould, gaps, leaks or cracking
- A few photos by email, if you can
- Whether it’s a home or a business
- The rough size of the job
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved and give you a clear price.
How the visit works
All our tools and materials come with us in the van. Once we have agreed what’s being done, the area is protected and the work begins. Most jobs take a few hours to a few days, depending on the length of joint and the access. In a small place like Gallowstree Common, access is normally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- 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.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- Let us know if you’ve seen damp or leaks
- Tell us about any previous sealing or DIY attempts
- Tell us about access, such as stairs, a lift or high-level joints
Ask for a quote
We quote each job on its own, so the first step is telling us about yours. Just call 0345 464 0079 or email us with the details, and pictures are welcome.
Related advice
DIY sealant or a professional job?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Landlord and commercial work in Gallowstree Common
We also work for property managers and facilities teams in Gallowstree Common and across Reading. Several sites can be quoted together.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.
When it is not the sealant
Before booking, it’s worth knowing the limits too:
- Cracking across the wall rather than at a joint
- Failed render or damaged cladding panels
- 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 before you book.
Surfaces we seal
- Concrete & block
- Joints between brick and frames
- Copings & trims
- Render & cladding joints
- Façade panels
- Brickwork movement joints
Common questions in Gallowstree Common
Do you cover smaller places like Gallowstree Common?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you work for landlords with property near Tilehurst station?
Yes, we work for letting agents and landlords. Just call 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear price.
Do you hold any approvals?
Yes. We are approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
Will there be a smell?
Possibly a little. Any smell clears as the sealant cures, and ventilation helps.
Do I need to be at home?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
What do you put in the joint?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We will tell you what we’re using and why.
Do you work at height?
Each building is different. Tell us the height, the number of joints and what’s below them, and we will confirm what access is needed.
Is there a guarantee?
Yes. Every job comes with our one-year guarantee.