Reading · England
Sonning Common External Mastic
External mastic in Sonning Common from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Rigid filler in a joint that should flex
- Panel joints letting water in
- Weeds or debris growing in open joints
Landlord and commercial work in Sonning Common
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance.
About our external mastic in Sonning Common
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible exterior sealant takes up that movement. If you are dealing with failed seals between different materials and sealant that has lost its bond to the brick or render, we can put it right.
In a smaller place like Sonning Common, some homes face open ground, so exposed walls and rooflines take more wind-driven rain. Joints on those sides are usually the first to go.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Where
- Sonning Common (RG4, RG9)
- Wider area
- Reading
- Guarantee
- 12 months on all our work
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Can I do it myself?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
Also near Sonning Common
Also in Sonning Common
Surface by surface
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. The movement joint takes that up, so the sealant in it must stay soft and stretchy.
Joints between dissimilar materials
Brick against render, concrete against metal, stone against timber: every change of material is a joint. A flexible sealant bridges the two so neither cracks the other.
Signs you need external mastic in Sonning Common
A lot of failed joints come down to preparation: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The sealant never bonds properly.
People usually contact us when they notice one of these:
- Sealant pulling away from one side of the joint
- Leaking joints around cladding and façade panels
- Movement joints with cracked, split or missing sealant
- Old sealant gone brittle and cracked
For site and facilities teams at buildings such as Sonning Common Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Questions to ask before booking
- When the joint can take water or movement
- Which sealant they’ll use, and why
- What guarantee comes with the work
- Is the old sealant removed completely?
Leave it or put it right?
An open joint keeps letting water into the wall with every downpour. Wet masonry is more easily damaged by frost around the joint, so the damage spreads beyond the joint. Homes in smaller places like Sonning Common can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
Leaving a failed joint normally makes the job bigger, not smaller, because water and mould keep working on it. If you’re unsure, call 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
Why choose Mr Mastic in Sonning Common
- We never seal over old sealant
- An ARBOMaster approved applicator
- Rated 4.9 stars on Google
- We agree the colour with you first
Take a look at our cost guide and our reviews.
Quotes for external mastic in Sonning Common
Your quote is based on your job. We take into account:
- Access and height
- Any working-time requirements on site
- Which sealant suits the joint
- The number and length of the joints
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all play a part.
Asking for a quote
You don’t need to know the technical terms. It helps if you can tell us:
- Whether it has been sealed before
- What the problem is, such as mould, gaps, leaks or cracking
- Where the property is
- Photos by email, if that is easy
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
The process
Every visit runs the same way: we look at the joints together, protect the area around them, carry out the job and clear up. Most jobs take a few hours for a handful of joints, longer for a whole elevation. For a job in Sonning Common, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Let us know about parking restrictions
- Plan for the work area to be out of bounds to pets and children
- Tell us about any previous sealing or DIY attempts
How to get a quote
We do not publish a price list. Instead, your job gets its own clear quote. To arrange one, phone 0345 464 0079 or email us.
Related advice
Questions from Sonning Common
Is Sonning Common within the area you cover?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you cover Sonning Common for external mastic?
Yes. Our work covers London and the South East, and Sonning Common is part of that. You can phone 0345 464 0079 or drop us an email and let us know what needs doing.
Will there be a smell?
Possibly a little. It fades as the sealant cures, and ventilation helps.
Can tenants book the work?
Yes, but check with your landlord or agent first. Many landlords are glad to have it sorted.
Can landlords and businesses book you?
Yes, often. We can quote for several properties at once.
What is backing rod for?
The foam is closed-cell backing rod. It stops the sealant going in too deep and bonding to three sides, which would stop it stretching.
Do you take out the old sealant first?
Yes. All of the old material is cut out and the joint cleaned.
What do you put in the joint?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference.
Outside joints around Sonning Common
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Greys Court (about 2.2 miles north-east) nearby, there’s older building stock in the area around Sonning Common as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
Rented homes near Henley-On-Thames station change hands often, and split movement joints are easy to miss on a rental until damp shows inside. Homes close to The Church of Christ the King include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move.
Sonning Common is about 3 miles north of Caversham, in Reading. Sonning Common gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Sonning Common is one of 34 places in Reading we cover.
Postcode districts we cover here for external mastic: RG4 and RG9. If you need external mastic at a property on Wood Lane, Green Lane and Woodbury Close or a nearby road, our applicators can take on the job. Neighbouring places we cover for external mastic include Peppard Hill (1 mile north-west), Rotherfield Peppard (1 mile north), Kidmore End (1 mile south-west), Kingwood Common (1 mile north-west) and Shepherd's Green (2 miles north). Within a short drive, we also cover Caversham (3 miles south), Norcot (4 miles south-west), West Reading (4 miles south), Tilehurst Within (5 miles south-west), Shinfield (8 miles south) and Arborfield Garrison (10 miles south). Sonning Common is among the bigger towns we cover in Reading.
Landmarks near Sonning Common
Locally, jobs take us to homes and businesses close to Maiden Erlegh Chiltern Edge, The Warwick School and Hare & Hounds pub and the streets around them. The closest station to Sonning Common is Henley-On-Thames station, roughly 3.7 miles east. Nearby you’ll also find Frazer Nash Archives (3.8 miles east) and Battle Hospital (4.1 miles south). For a walk, there’s Sonning Hill and Warburg Nature Reserve.