Bracknell Forest · England
External Mastic in Brockhill
Sealing brickwork movement joints, render, cladding and façade joints for householders, landlords and businesses in Brockhill. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Old sealant gone brittle and cracked
- Sealant pulling away from one side of the joint
- Joints with sealant missing in places
External mastic in Brockhill
We are ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Porous or awkward surfaces are primed where the sealant needs it and we use one wherever it does. If you’re dealing with rain getting behind render or cladding at a joint and weathered mastic that no longer stretches, we can put it right, on render & cladding joints, façade panels and joints between brick and frames alike.
External sealant needs dry, clean surfaces, so work around Brockhill is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
You get a 12-month guarantee, the same in Brockhill as everywhere else we work.
- Where
- Brockhill (RG42)
- Wider area
- Bracknell Forest
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
For landlords and businesses
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Letting agents and landlords in Brockhill can book us as well as homeowners. Resealing between tenancies keeps a property looking cared for.
Towns and villages near Brockhill
More services for Brockhill
How to look after the new joints
Good habits help new joints last longer. Our tips:
- Show decorators and builders where the movement joints are
- Never let anyone fill a movement joint with mortar
- Walk round the building once a year and look at the joints
- Ask before painting over external sealant
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
Leave a failed movement joint and water keeps getting into the wall. That can lead to damp patches, staining and frost damage, all bigger jobs than a reseal.
Walls and rooflines in Brockhill
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like St Leonard's Hill (about 3.4 miles north-east) are a reminder that the area around Brockhill has older buildings as well as new. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
If you let a flat or house near Martins Heron station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Brockhill is about 3 miles north-east of Bracknell, in Bracknell Forest. From the centre of Brockhill to the outskirts, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Brockhill is one of 41 places in Bracknell Forest we cover. You can also see our page for Reading, about 11 miles away.
We cover every part of the RG42 postcode area for external mastic and the streets around it. We also cover the places around Brockhill: Maiden's Green (1 mile north-east), Winkfield Street (1 mile north-east), Warfield (1 mile west), Winkfield Row (1 mile south) and Nuptown (1 mile north-west). Within a short drive, we also cover Bracknell (3 miles south-west), Sandhurst (7 miles south-west), Binfield (3 miles west), Great Hollands (4 miles south-west), Forest Park (3 miles south) and Temple Park (3 miles south-west).
Near you in Brockhill
Typical jobs here are in homes near The Winning Post pub, Winkfield St Mary's CofE Primary School and Garth Hill College. For rail, the closest station is Martins Heron station, about 2.3 miles south. Other landmarks nearby include Heatherwood Hospital (2.4 miles south-east) and The Lexicon (2.2 miles south-west). The countryside around Brockhill includes Bray Pit.
Brockhill questions
Will you come out to Brockhill?
Yes, Brockhill is covered. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
I let a flat near Martins Heron station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just ring 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear price.
Can new sealant go over the old?
No, because it fails. The old sealant always comes out first, so the new joint bonds to clean surfaces.
What colours does the sealant come in?
Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We pick the one that suits your wall best.
Do you take out the old sealant first?
Yes, always, and completely. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
How long should I leave it?
Cure times vary by product. We tell you how long to leave it before we go.
How long does external mastic last?
It depends on the exposure, the movement and the product. Treat it as a maintenance item and look at it yearly.
Can you work on commercial sites?
Yes. We can plan bigger jobs in stages.
Should I try it myself first?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
How it works
A visit follows a simple pattern: we check the joints, mask and protect the surrounding surfaces, do the work and clear up. It usually takes a few hours for a handful of joints, longer for a whole elevation. Somewhere like Brockhill needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- 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.
How to prepare
- Keep children and pets away from the work area
- Let us know about parking restrictions
- Tell us about any water getting in
Getting a quote
For external mastic in Brockhill, phone 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Read more
When it is not the sealant
To be straight with you, there are a few things sealant will not fix:
- Render that is blown, hollow or coming away
- Damp that is not coming from the joint
- Cracking across the wall rather than at a joint
Not sure which it is? You can phone 0345 464 0079 or email us and we’ll tell you honestly.
Surfaces we seal
- Brickwork movement joints
- Copings & trims
- Façade panels
- Render & cladding joints
- Joints between brick and frames
- Concrete & block
What affects the quote in Brockhill
Your quote is based on your job. We look at:
- The type of sealant required
- The old material and how stubborn it is
- How many areas need sealing
- The amount of work
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’ll explain what it covers.
Asking for a quote
What to tell us when you ask for a quote:
- A few pictures by email, if you can
- Where the property is
- If it’s domestic, commercial or a hotel
- How many joints, rooms or windows are involved
To get a quote, call 0345 464 0079 or drop us an email with the location and a short description of the problem. You will have a clear quote before work begins.
Do you need external mastic in Brockhill?
A lot of failed joints come down to preparation: dusty or wet faces, no primer where one was needed, or old sealant left in. The new sealant then lets go long before it should.
People usually contact us when they notice something like this:
- Old sealant gone brittle and cracked
- Sealant that has lost its bond to the brick or render
- Weeds or debris growing in open joints
- Failed sealant between panels on a façade
Homes close to Church of St Mary include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move.
What to look for in a quote
- How the surfaces are prepared before sealing
- When the joint can take water or movement
- Whether all the old sealant comes out first
- Which sealant they’ll use, and why