Essex · England
Theydon Bois External Mastic
Specialist external mastic for Theydon Bois: careful preparation, the right product and tidy work. Call for a quick quote.
- Sealant that has lost its bond to the brick or render
- Old sealant gone brittle and cracked
- Failed seals between different materials
Signs you need external mastic in Theydon Bois
Some movement joints have been pointed up with mortar. The joint can’t move, so the wall cracks somewhere else instead.
People usually contact us after spotting one of these:
- Movement joints filled with mortar instead of sealant
- Failed seals between different materials
- Plants rooting in failed movement joints
- Rain getting behind render or cladding at a joint
If you look after a building such as Theydon Bois Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Before booking anyone
- What the quote includes, VAT included or not
- Are they insured?
- What happens if they find a problem under the old sealant
- Whether the sealant suits the joint
External mastic for homes and businesses in Theydon Bois
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. We pick a colour that sits well with the wall so the line blends in. We work on joints between brick and frames, brickwork movement joints and concrete & block, and people most often call us about cracked joints where brick meets render or frames and hard, crazed mastic that has stopped moving.
In and around Theydon Bois, older properties sit alongside newer ones, each with its own outside joints. Older homes need their gutter and trim joints kept tight, newer ones their movement joints.
All of our work is guaranteed for twelve months.
- Where
- Theydon Bois (CM16)
- Region
- Essex
- Cover
- A year, on every job
- Price
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What affects the quote in Theydon Bois
The quote reflects the job in front of us. We look at:
- Working hours on commercial sites
- Which sealant suits the joint
- The size of the job
- Mould in or behind the old 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, and we’ll explain the quote if you ask.
Helping us quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- If someone has resealed it before
- A few photos by email, if you can
- The address or postcode of the job
- Whether it’s a home or a business
To get a quote, phone 0345 464 0079 or drop us an email with the location and a short description of the problem. We will send you a clear quote before any work starts.
What we do, step by step
When we arrive, we start by going over the job with you, so you know exactly what we are doing. Surfaces next to the work are protected before we start. Most jobs take a few hours to a few days, depending on the length of joint and the access. For a job in Theydon Bois, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- The old mastic and anything lodged in the joint is removed.
- Both sides are cleaned back to sound material and primed if needed.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Preparing for the visit
- Let us know about stairs, lifts or work at height
- Try not to wet indoor joints just before the visit
- Clear items away from the joints we’re working on
Ask for a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
Related advice
Walls and rooflines in Theydon Bois
Historic houses like Hill Hall (about 2.3 miles east) are a reminder that the area around Theydon Bois has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For an older house near a landmark such as Parish Church of St Mary, old and new materials meet at the roofline and walls, which is where sealant earns its keep. Letting a property close to Chingford station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Theydon Bois is about 2 miles north-east of Loughton, in Essex. Homes, rented property, offices and hotels in Theydon Bois is covered for external mastic, old or new, large or small. Every job comes with our 12-month guarantee. Theydon Bois is one of 644 places in Essex where we work for external mastic. There’s also a page for London, about 15 miles away.
Postcode districts we cover here for external mastic: CM16. Whether your property is on Buxton Road, Orchard Drive and Elizabeth Drive or anywhere close by, we can help. Main roads around Theydon Bois include the B172. We also cover the places around Theydon Bois: Debden Green (1 mile south-west), Debden (2 miles south), Loughton (2 miles south-west), Upshire (3 miles north-west) and High Beech (3 miles west). Within a short drive, we also cover Harlow (7 miles north), Brentwood (9 miles east), Billericay (14 miles east), Harold Wood (8 miles south-east), Laindon (15 miles south-east) and Buckhurst Hill (4 miles south-west).
Near you in Theydon Bois
Locally, jobs take us to homes and businesses close to Queen Victoria Public House and Davenant Foundation School. The nearest railway station is Chingford station, roughly 4.7 miles south-west. Well-known places in the area include St. Margaret's Hospital (2.5 miles north-east) and Epping Signalling Museum (1.6 miles north-east). Green spaces nearby include Lippitts Hill and Home Mead.
Towns and villages near Theydon Bois
More services for Theydon Bois
DIY versus a professional finish
If you’re 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 does not work out, we can still put it right.
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.
What we cannot put right
Before you book, it’s worth knowing the limits too:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Failed render or damaged cladding panels
- Walls that need new movement joints cut into them
If in doubt, call 0345 464 0079 or email us and we will say what we think.
Surfaces we seal
- Façade panels
- Concrete & block
- Joints between brick and frames
- Copings & trims
- Brickwork movement joints
- Render & cladding joints
Aftercare tips
After the cure time, these simple habits help:
- Keep high-pressure jets off the joints
- Check the sealant is paintable before painting near it
- Make sure movement joints aren’t pointed over
- Fix overflowing gutters above sealed joints
Make sure anyone working on the wall later knows where the movement joints are. They must stay as flexible joints, never rendered or pointed over.
An open movement joint lets rain into the wall every time it pours. Over time it can mean damp inside, stained render or frost-damaged brick.
Landlords, agents and businesses in Theydon Bois
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.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. Several properties can go on one quote.
Theydon Bois questions
I let a flat near Chingford station. Can you help?
Yes, landlords and agents are among the people we work for. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll send you a clear quote.
Is Theydon Bois in your area for external mastic?
Yes. Our work covers London and the South East, and Theydon Bois is part of that. You can ring 0345 464 0079 or drop us an email and let us know what needs doing, and we’ll give you a clear quote.
Can you seal joints between two different materials?
Yes. Joints between dissimilar materials are a big part of external work. We use a flexible sealant suited to both surfaces.
Can you quote for more than one area?
Of course. Doing several areas at once is usually more efficient, so mention them when you ask for a quote.
What should I tell you?
The location, the problem and the rough size of the job. Photos by email help too.
Can you match the colour of my brickwork?
We aim for a joint that suits the wall rather than one that jumps out. Colour is agreed with you before we begin.
Is it messy?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
Can you seal over the old sealant?
No. The old sealant always comes out first.