Buckinghamshire · England
Bisham External Mastic
We cover Bisham for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly.
- Movement joints filled with mortar instead of sealant
- Sealant that has lost its bond to the brick or render
- Water getting into walls through failed joints
External mastic in Bisham, done properly
External mastic is a job where short cuts show quickly. New sealant over old, joints packed with mortar and beads with no backing rarely last long. We strip the joint back and start again. We are often asked to deal with leaking joints around cladding and façade panels and gaps where render, brick and frames meet, on render & cladding joints, brickwork movement joints and joints between brick and frames.
External sealant needs dry, clean surfaces, so work around Bisham is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we will put it right.
- Location
- Bisham (SL7)
- Region
- Buckinghamshire
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Walls and rooflines in Bisham
Historic houses like Harleyford Manor (about 1.5 miles west) are a reminder that the area around Bisham has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Managing a site like Bisham Church of England Academy? Then its movement joints, gutters and trims need looking after like any other building’s. For an older house near a landmark such as Church of All Saints, an extension built onto an older house moves differently, and the joint between them takes the strain. Letting a property close to Marlow station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
Bisham is about 1 mile south of Marlow, in Buckinghamshire. We carry out external mastic for homes and businesses in Bisham. Bisham is one of 263 places in Buckinghamshire where we work for external mastic. Our Reading page covers work nearby (11 miles or so).
Here we cover the SL7 postcode area for external mastic. Local streets include Bisham Court, Marlow Road and Vansittart Road, all of which we cover. If you’re just outside Bisham, we cover Temple (1 mile south-west), Marlow (1 mile north), Cookham Dean (1 mile east), Pinkneys Green (2 miles south) and Cookham (2 miles east). We also work in nearby towns such as High Wycombe (5 miles north), Chesham (13 miles north-east), Amersham (11 miles north-east), Beaconsfield (7 miles north-east), Chalfont St Peter (10 miles east) and Princes Risborough (12 miles north).
Around Bisham
Typical jobs here are in homes near The Bull Inn and Sir William Borlase's Grammar School and the streets around them. The nearest railway station is Marlow station, about 1 mile north. Well-known places in the area include Marlow Museum (0.7 miles north) and Marlow Community Hospital (1.1 miles north). Green spaces nearby include Taplow Lake and Weycock Hill.
Also near Bisham
Other services in Bisham
Bisham questions
I let a flat near Marlow station. Can you help?
Yes. We work for landlords and letting agents as well as homeowners. You can call 0345 464 0079 or email us with the details for a clear quote.
Is Bisham within the area you cover?
Yes, we do. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Will you leave a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Is there a guarantee?
Yes. Every job comes with our 12-month guarantee.
Can you quote for more than one area?
Yes. Tell us about everything you’d like done and we will quote it together.
What colours does the sealant come in?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We pick the one that suits your wall best so the joint doesn’t draw the eye.
Can I do it myself?
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.
When will the joints need doing again?
It depends on the exposure, the movement and the product. Treat it as a maintenance item and look at it yearly and renew it when it starts to fail.
Honest limits
We won’t take on work that will not last, so these are the limits:
- Loose or hollow render, which needs re-rendering
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Cracks in the bricks or render themselves, away from the joints
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly.
Joints and surfaces we work on
- Brickwork movement joints
- Render & cladding joints
- Concrete & block
- Façade panels
- Copings & trims
- Joints between brick and frames
How we quote for external mastic
We quote each job individually. These are the things that affect it:
- The number and length of the joints
- Whether there’s mould to deal with
- The number of rooms or windows
- The old material and how stubborn it is
What it costs depends on the size of the job, how much old material has to come out and access to the work. You’ll have a clear quote before any work starts, so you know where you stand.
What we need to know
To help us quote quickly, let us know:
- Any access issues, like height or stairs
- Whether it has been sealed before
- What’s wrong with the joints now
- Roughly how big the job is
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. When it suits you, call 0345 464 0079 or drop us an email.
Work for landlords, hotels and businesses
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
If you manage several properties in or around Bisham, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
How the visit works
A visit follows a simple pattern: we check the joints, protect the area around them, carry out the job and tidy away. It generally takes a few hours to a few days, depending on the length of joint and the access. Somewhere like Bisham needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Getting ready for the visit
- Keep children and pets away from the work area
- For business premises, tell us about site rules or sign-in
- Where the joints are inside, avoid wetting them before we arrive
Getting a quote
For external mastic in Bisham, call 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
Advice
Surface by surface
Concrete and blockwork
Big joints in concrete need careful depth control. We size the backing rod to the gap.
Cladding and façade panels
Cladding and façade panels are generally separated by sealed joints. Each joint gets a sealant that suits the panel and its movement.
How to look after the new joints
Good habits help new joints last longer. A few tips:
- Avoid pressure-washing directly into sealant joints
- Make sure movement joints are not pointed over
- Tell anyone working on the walls about the movement joints
- Deal with leaking gutters that soak the joints below
Keep pressure washers away from the sealant. A strong jet can damage the edges of the bead and let water in behind.
Leaks behind façade panels and render often go unseen. By the time there’s a damp patch, the damage can be well established.
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
If you do try it yourself, take your time over the 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.