Hampshire · England
External Mastic in Winchester
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Winchester and across Hampshire. Fully insured, ARBOMaster approved and guaranteed for a year.
- Damp patches traced to an open external joint
- Weeds or debris growing in open joints
- Gaps where render, brick and frames meet
What happens on the day
Once we are on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. After that, the work takes a few hours for a handful of joints, longer for a whole elevation. In central Winchester, parking can be tight, so tell us about driveways, permits or nearby car parks. For flats, mention stairs, lifts and shared entrances as well.
- First we look over the joints with you, agree which to renew and talk through access.
- The old mastic and anything lodged in the joint is removed.
- Both sides are cleaned back to sound material and primed if needed.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
How to prepare
- Let us know about parking restrictions
- Move anything stored near the joints
- Let us know if you’ve seen damp or leaks
Get a quote
There’s no standard price list. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or send us an email.
Related advice
How we handle external mastic in Winchester
Short cuts in external joints show up within a season or two. Overfilled joints, missing backing rod and sealant laid over old sealant rarely last long. We strip the joint back and start again. If you are dealing with joints with sealant missing in places and gaps where render, brick and frames meet, we can help.
A place the size of Winchester has buildings of every age, from older brick terraces to modern blocks with rendered or clad walls. Newer buildings rely on sealed movement joints, while older ones need their gutters, fascias and trims kept tight.
There’s a 12-month guarantee on every job, large or small.
Towns and villages near Winchester
What else we do in Winchester
How to look after the new joints
A little care helps the new joints last. We recommend:
- Ask before painting over external sealant
- Fix overflowing gutters above sealed joints
- Keep high-pressure jets off the joints
- Never let anyone fill a movement joint with mortar
Keep the joints clear of soil, plants and climbing growth. Anything that holds water against the joint wears it out sooner.
Leave a failed movement joint and water keeps getting into the wall. Over time it can mean damp inside, stained render or frost-damaged brick which cost more to put right than the joint.
When it is not the sealant
It helps to know what we cannot do:
- Cracked brickwork or render that needs a builder or plasterer
- Adding movement joints to masonry that has none
- Structural movement, which needs a surveyor or engineer
If in doubt, phone 0345 464 0079 or email us and we’ll say what we think before booking.
Surfaces we seal
- Render & cladding joints
- Concrete & block
- Copings & trims
- Joints between brick and frames
- Façade panels
- Brickwork movement joints
FAQs for Winchester
Can you do external mastic in Winchester?
Yes, Winchester is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job.
What guarantee comes with external mastic in Winchester?
All our work, in Winchester and everywhere else, comes with a 12-month guarantee. We are fully insured, and an ARBOMaster approved applicator.
Why do you put foam in the joint first?
Backing rod controls the sealant depth and keeps it off the back of the joint. That way it bonds to the two sides only and can stretch.
Which products do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Do you remove the old sealant?
Yes, always, and completely. New silicone doesn’t stick to old silicone, so any old material comes out before anything new goes in.
Do you seal joints where cladding meets other materials?
Yes. The old joint is removed, both surfaces cleaned and primed where needed, and a flexible sealant applied. We pick a colour that works with both materials.
Can a movement joint be filled with mortar?
No, not if it’s a movement joint. Filling it with mortar defeats its purpose and can lead to cracking. We’ll reseal it with a flexible sealant.
Do you work for hotels and businesses?
Yes. We’ve worked for hotels, offices and other businesses, and we’re fully insured.
Can I do it myself?
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.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Walls and rooflines in Winchester
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For an older house near a landmark such as St Swithun-upon-Kingsgate Church, the joints between older walls, newer extensions and the roofline need a sealant that can move. Managing a site like St Bede Church of England Primary School? Then larger buildings have long runs of movement joint that eventually need resealing.
Winchester is in Hampshire. Anywhere in SO22, we can carry out external mastic at your property. Across Hampshire, we cover 683 places, and Winchester is one of them. You can also see our page for Southampton, about 10 miles away.
We work across SO22, SO23, SO32 and SO21 for external mastic. Local streets include The Square, Market Street and Market Lane, and we cover them all. Winchester is on the A31 and A32, which makes it straightforward to reach with everything needed for external mastic. We also cover the places around Winchester: Bar End (1 mile south-east), Highcliffe (1 mile east), Hyde (1 mile north), St Cross (1 mile south) and Stanmore (1 mile south-west). Further out, we also cover Eastleigh (6 miles south), Fareham (15 miles south), Andover (13 miles north-west), Totton (13 miles south-west), Chandler's Ford (6 miles south-west) and Hedge End (10 miles south). Winchester is among the bigger towns we cover in Hampshire.
Near you in Winchester
Locally, jobs take us to homes and businesses close to Peter Symonds College, The Green Man pub and Leigh House Hospital, among other places. Winchester’s nearest station is Winchester station, about 0.6 miles north of the centre. A little further out are Winchester City Museum (within half a mile north-east) and St John's Rooms And Chapel (less than half a mile east). For a walk, there’s Winnall Moors and Twyford Down.
Common problems we fix in Winchester
Poor preparation causes many early failures: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The sealant never bonds properly.
Common reasons people contact us include:
- Weeds or debris growing in open joints
- Sealant that has lost its bond to the brick or render
- Rigid filler in a joint that should flex
- Brick movement joints where the sealant has split
Rented homes near Winchester station change hands often, and split movement joints are easy to miss on a rental until damp shows inside.
What to look for in a quote
- Which colour the sealant will be
- When the joint can take water or movement
- Who turns up on the day
- Whether VAT is included
What the job involves on each surface
Concrete and blockwork
The face of concrete or block is often dusty, so cleaning and priming matter. A primer goes on where the product requires one.
Copings and trims
Copings expand and contract through the day, so a flexible sealant suits them best.
Landlords, agents and businesses in Winchester
In hotels, rooms out of use cost money, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
We work for landlords and agents as well as householders. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.