Windsor and Maidenhead · England
External & façade joints in Woodside, Windsor and Maidenhead
Movement joints in Woodside need attention? We cut out the old, prepare the joints and apply the right sealant, with a one-year guarantee.
- Joints where the bead has come unstuck
- Water getting into walls through failed joints
- Cracked joints where brick meets render or frames
Work for landlords, hotels and businesses
We also work for property managers and facilities teams in Woodside and across Windsor and Maidenhead. We can quote a run of properties together, and we are fully insured.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. Several properties can go on one quote.
External mastic for homes and businesses in Woodside
Getting the depth right is half the job. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, so it bonds to the two sides only and can stretch. We work on concrete & block, render & cladding joints and joints between brick and frames, and common reasons people get in touch are panel joints letting water in and moss and dirt in joints with no sealant left.
External sealant needs dry, clean surfaces, so work around Woodside is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
Big or small, it’s backed by our one-year guarantee in Woodside and across Windsor and Maidenhead.
- Where
- Woodside (SL4)
- Wider area
- Windsor and Maidenhead
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Also near Woodside
Also in Woodside
Surface by surface
Render joints
Render is weaker at the surface than brick, so a low-modulus sealant is kinder to the joint edges. We prime where the product needs it.
Cladding and façade panels
Metal and composite panels move a lot with temperature, so the joints work hard every day. We choose the product to suit.
What affects the cost of external mastic
Jobs vary more than people expect. The main factors:
- Whether old sealant or filler has to be cut out
- How many rooms, windows or areas are involved
- Working hours on commercial sites
- The product the joint needs
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 for an honest opinion and a quote.
What to tell us for a quote
Before you ask for a quote, have a think about:
- Pictures of the joints, sent by email
- If someone has resealed it before
- Where the job is, and your postcode
- The problem you’ve noticed
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that’s easy.
How it works
When we arrive, we look over the joints with you first, so there are no surprises. Surfaces next to the work are protected before any work begins. The work normally takes a few hours for a handful of joints, longer for a whole elevation. Somewhere as small as Woodside, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First we look over the joints with you, agree which to renew and talk through access.
- We cut out the failed sealant and rake out any dirt or growth.
- The joint faces are cleaned and primed where the sealant needs it.
- 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.
Before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- Plan for the work area to be out of bounds to pets and children
- Where the joints are inside, avoid wetting them before we arrive
Ask for a quote
Every job is quoted individually. Simply ring 0345 464 0079 or email us and describe the job, and pictures are welcome.
Read more
Why act early in Woodside
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. In a small place like Woodside, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Why choose Mr Mastic in Woodside
- Every job guaranteed for a year
- Over 20 years’ experience
- We’re fully insured
- Domestic, commercial and hotel work
See what affects the cost or our reviews.
Your questions about external mastic in Woodside
Will you come out to Woodside?
Yes. Woodside is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Can you help a landlord with a rental near Ascot station?
Yes, landlords and agents are among the people we work for. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we’ll send you a clear quote.
When will the joints need doing again?
It varies from wall to wall: sunny, exposed elevations and busy joints wear faster. A yearly look will tell you when they need doing. Every job carries our 12-month guarantee.
Do you remove the old sealant?
Yes. We cut out all the old sealant and clean the joint before applying anything new.
How long before the joint can be used?
Many sealants skin over quickly but take longer to cure fully. We’ll give you the cure time for the product we used.
Are you ARBOMaster approved?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Should I point up the gap in my brickwork?
No. Rigid materials can’t move with the wall. Where a joint has been mortared, it can often be raked out and sealed properly.
What is backing rod for?
We fit closed-cell backing rod wherever the joint depth needs controlling. It controls the depth and stops the sealant bonding to the back, so the joint can move.
Walls and rooflines in Woodside
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. With historic houses such as St Leonard's Hill (about 2.6 miles north) nearby, there’s older building stock in the area around Woodside 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.
For landlords with property near Ascot station, outside joints that have cracked can let damp into a rental, so check them between lets. For an older house near a landmark such as Church of St Peter, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Woodside is about 3 miles south-west of Windsor, in Windsor and Maidenhead. Homes, rented property, offices and hotels in Woodside is covered for external mastic, old or new, large or small. Every job comes with our one-year guarantee. Woodside is one of 57 towns and villages in Windsor and Maidenhead where we work. Reading is on our list too, around 13 miles away.
Every address in SL4 is within our area for external mastic, from the main roads to the quietest streets. External mastic is available to properties on Woodside Road, Fydlers Close and Kiln Lane. Close by, we work in Plaistow Green (1 mile north-west), Brookside (1 mile south-west), Cheapside (1 mile south-east), Cranbourne (1 mile north) and The Village (1 mile north-east). Larger places within reach include Maidenhead (7 miles north-west), Windsor (3 miles north-east), Boyn Hill (6 miles north-west), Cookham (9 miles north), Furze Platt (8 miles north-west) and Dedworth (3 miles north).
Around Woodside
Around Woodside, our work takes us to homes and buildings near Papplewick School, Silwood Park and Rose pub and the streets around them. The nearest railway station is Ascot station, about 1.8 miles south of the centre. Other landmarks nearby include Windsor Castle (4.5 miles north-east) and Heatherwood Hospital (1.7 miles south-west). Open spaces near Woodside include Bray Pit and Virginia Water Lake.
Do you need external mastic in Woodside?
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 normally contact us when they notice something like this:
- Brick movement joints where the sealant has split
- Panel joints letting water in
- Sealant pulling away from one side of the joint
- Joints pointed up with cement by mistake
Managing a site like Cranbourne Primary School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Questions to ask before you book
- Are they insured?
- Whether they seal over old material or remove it
- Whether you can choose the colour
- How long the guarantee is
Looking after it afterwards
After the cure time, these simple habits help:
- Leave the joints unpainted unless we have said otherwise
- Fix overflowing gutters above sealed joints
- Wash walls gently around the sealant
- Never let anyone fill a movement joint with mortar
Look over the joints once a year, ideally after winter. Splits, gaps at the edges or plants in the joint are early warning signs.
An open movement joint lets rain into the wall every time it pours. That can lead to damp patches, staining and frost damage which cost more to put right than the joint.