The Mastic Doctor team standing beside their branded vans outside an office building
Oxfordshire · England

Facade Sealing contractors in Long Wittenham

Work needed on a facade joint in Long Wittenham? We assess it, carry out the work and guarantee our workmanship for 12 months.

  • Failed sealant on precast panel joints
  • Sealant pulling away from frames or panels
  • Unsightly perimeter sealant on a visible elevation
1
Send details
Photos, drawings or a schedule, or we visit.
2
Get a quote
Scope agreed and priced before anything starts.
3
We seal
Prepared joints, the specified product, a tidy finish.
4
Guaranteed
Signed off, with 12 months’ guarantee.
South East, London & Scotland
CHAS accredited
£5m public liability

Facade sealing near Long Wittenham

Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.

Facade sealing in Long Wittenham

Access is part of every facade job, and we plan it with you before quoting. Let us know what access exists or is planned, and any site rules we need to work around, and we’ll fit the work around it. If you are dealing with perimeter sealant that has split or peeled away and damp patches beside frames after rain, we can help, on perimeter joints where frames meet the structure, shopfront frames and stone and brick facade joints alike. Sealant applicators who only do sealant are a different proposition from a general trade with a gun in the van: on jobs in Long Wittenham, preparation and product choice get the time they need.

In the countryside around places like Long Wittenham, conversion schemes put new frames into old stone, flint, brick or timber. Those joints need a sealant that suits an uneven, sometimes porous surface, and often a colour chosen for the building.

What our 12-month guarantee covers is the way we did the job: the preparation, the sealing and the tooling. It doesn’t extend to damage, other trades’ later work or movement the joint was never designed to take.

Mastic Doctor team members lined up next to their branded vans outside an office building
Place
Long Wittenham (OX14)
Wider area
Oxfordshire
Guarantee
12 months on our workmanship
Price
Fixed quote, scope in writing
Phone
01277 525 020
Page updated
3 November 2026

Commercial clients in Long Wittenham

For main contractors, we work as the sealant subcontractor, on new build and refurbishment alike. Programme, specification and site rules come first, with CSCS-carded applicators on site.

Hotels, schools, healthcare sites, offices and retail units book us directly too. We plan around the way the building is used, so guests, pupils, patients or staff are disturbed as little as possible.

After the work

For the best life from the joints:

  • Keep the sealant details on the building file
  • Walk the elevations once or twice a year
  • Share access with other external trades
  • Don’t wait for a second leak before calling

Hold back any cleaning crew until the joints have had their stated cure time. Keep high-pressure jets and strong chemicals away from new sealant, so brief your window cleaners.

Deal with sections that fail early as soon as they show. Small repairs stop small leaks becoming large ones.

Building and refurbishing in Long Wittenham

Long Wittenham sits in one of the drier corners of the country, the South East. That doesn’t stop wet spells, or frosty starts that leave panels too damp to seal, so we time external mastic for dry faces and agree it with the site team. Long Wittenham is about 49 miles from central London. Towns within reach of London tend to keep building, from flats to offices and schools, and main contractors there need mastic that keeps to the programme.

School extensions, at buildings such as Long Wittenham (Church of England) Primary School, usually run to the summer holidays, mastic included. New wings at hospitals like Abingdon Community Hospital (to the north-west of Long Wittenham) bring long runs of window and panel joints to seal. For contractors refurbishing units at places like Southmead Industrial Estate, 2.1 miles to the south-west of Long Wittenham, the mastic covers cladding panels, roller-door and window perimeters.

Long Wittenham is about 3 miles north-east of Didcot, in Oxfordshire. If you’re looking for facade sealing in Long Wittenham, we can help, as we do across Oxfordshire. Long Wittenham is one of 423 places we cover in Oxfordshire for facade joints. We also cover Oxford, some 8 miles away.

Anyone looking for facade sealing in OX14 gets the same process as the rest of our area: send details, get a quote, we seal, guaranteed. If your site is on High Street, Didcot Road and Wessex Way or close by, we can quote for facade joints. Sites close to Long Wittenham are covered too, including Clifton Hampden (1 mile north), Appleford-on-Thames (1 mile west), Culham (2 miles north-west), Didcot (3 miles south-west) and Sutton Courtenay (3 miles west). Bigger towns within reach include Oxford (8 miles north), Abingdon-on-Thames (4 miles north-west), Thame (13 miles north-east), Wantage (10 miles west), Henley-on-Thames (15 miles south-east) and Grove (9 miles west).

Landmarks near Long Wittenham

Locally, jobs take us to sites close to The Plough Public House and the streets around them. The closest station to Long Wittenham is Appleford station, roughly 1.3 miles west. Well-known places in the area include Brightwell Castle (2.6 miles south-east) and Pendon Museum (under half a mile west). For a walk, there’s Wittenham Clumps and Mowbray Fields.

Map of Long Wittenham © OpenStreetMap contributors

Surface by surface

Brick and stone facades

On masonry, the sealant has to suit a porous, textured surface. We avoid acetoxy silicone, which can stain some natural stone, with primer where its maker specifies.

Render and coated surfaces

Paintable sealants exist for joints that will be coated. The choice depends on the specification and finish.

Our process

Before any cutting starts, the area is protected: masking tape along the joint edges and sheeting over anything nearby. On site, the work normally takes anything from a single day to several weeks, depending on joint lengths, access and the weather, and our waste is bagged and taken away as we go. Jobs in and around smaller places like Long Wittenham are normally planned as a single visit, so photos and measurements up front really help. Then the right materials arrive with us.

  1. We look at the joints, the drawings and the access before pricing.
  2. The old bead is cut away completely, not overlaid.
  3. Joint faces are cleaned to firm, sound material, with primer where the sealant maker specifies it.
  4. Backing rod, or bond-breaker tape in shallow joints, limits the depth.
  5. A facade-grade sealant rated for the movement goes in, tooled to a concave profile.
  6. We walk the finished joints with you before handing over.

Getting the site ready

  • Arrange parking or a loading space
  • Share your working hours and any access restrictions
  • Send any specification or drawings in advance

Getting a fixed quote

Send us photos, drawings or a joint schedule and a fixed quote comes back to you. Where a site visit makes more sense, we’ll arrange one.

Get a price

Related advice

What sealant work can’t fix

Before quoting, we check that sealant is the right answer. It isn’t the answer for:

  • Installing or repairing glazing systems
  • Render or concrete edges that have broken away
  • Water getting in through cracked render or porous masonry

Not sure which it is? You can call the office on 01277 525 020 or email drawings and photos and we’ll tell you honestly before you book.

Joints and surfaces we work on

  • Window and door perimeters
  • Perimeter joints where frames meet the structure
  • Stone and brick facade joints
  • Cladding panel joints
  • Shopfront frames
  • Coping and flashing joints

Your questions answered

Will you take on work at estates like Southmead Industrial Estate, close to Long Wittenham?

Yes. Our area takes in Long Wittenham and its surroundings, with estates and business parks such as Southmead Industrial Estate included. Photos and a short description are enough for a first look.

Is a hospital such as Abingdon Community Hospital somewhere you can work?

Yes, hospitals are one of the sectors we cover. We follow the site’s permits, sign-in and infection-control procedures in every area.

Which sealant do you use on facades?

Low-modulus, neutral-cure silicone suits many facade and perimeter joints. Some joints call for hybrid, PU or polysulphide instead, depending on the substrate and the specification.

Do you run new sealant over the existing bead?

No. New sealant won’t hold on old sealant, so the old bead is cut away. Nothing else gives a bond that lasts.

Do you hold CHAS accreditation?

Yes. We are CHAS accredited and a Constructionline member, which helps with supplier vetting.

Can you find out why a window is leaking?

Yes. We check the sealant joints and report what we find before quoting. If the water seems to come from a roof, sill or the glazing unit instead, we say so.

Do you seal on top of existing sealant?

No. We cut the old material out and clean the joint back before sealing, because fresh silicone will not bond with aged silicone.

Why it’s worth doing now in Long Wittenham

The longer a failed joint is left, the more the substrate suffers: edges get wet, render and timber deteriorate and frames can move. Early action keeps it simple. Converted and older buildings near places like Long Wittenham tend to move, and aged sealant cracks. The right product, sized to the joint, copes much better.

There’s no price list, because the scope varies so much from one building to the next. For a fixed figure, call for a quote.

Why us?

  • One number for every site we cover
  • Coloured sealants to suit the setting, where available
  • Colour agreed before work starts
  • RAL and finish matching where the product range allows

Take a look at what affects the cost or our accreditations.

Accreditations

Trusted. Accredited. Insured.