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

Shephall facade sealing

Our CSCS-carded applicators take on facade joint and window perimeter sealing on commercial buildings in Shephall and the surrounding area. Send photos or drawings for a fixed quote.

  • Sealant pulling away from frames or panels
  • Unsightly perimeter sealant on a visible elevation
  • Old perimeter mastic that has dried out
1
Send details
Drawings, photos, a joint schedule or a site visit.
2
Get a quote
A fixed price, with what’s included set out clearly.
3
We seal
Failed joints cut out, faces prepared, new sealant laid.
4
Guaranteed
12-month guarantee on our workmanship.
Covering the South East & Scotland
CHAS accredited
Fully insured: £5m PL

Facade sealing near Shephall

Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.

Doing it in-house

There’s also the paperwork. Many sites expect CSCS cards, RAMS and proof of insurance, and our CSCS-carded applicators are used to working under those rules.

Site maintenance staff can often handle a short internal joint. Where it goes wrong is preparation: sealing over old material, sealing onto damp or dusty surfaces, or a product that can’t take the movement.

Facade sealing in Shephall

Every facade quote starts with how the joints will be reached. Let us know what access exists or is planned, and any site rules we need to work around, so the price covers the real job. We work on coping and flashing joints, window and door perimeters and cladding panel joints, and what we’re called in for most is weathered joints at frame-to-structure perimeters and patch repairs that keep failing. Searching for sealant specialists in Shephall? We’ve been sealing commercial buildings since 2005.

Around places like Shephall, a lot of construction is the conversion of older buildings, which leaves joints between old walls and new frames that need a sealant able to take the movement, in a colour the planners or architect are happy with.

Every job is signed off with a 12-month guarantee. The promise is simple: if the work we did fails within twelve months, we return to fix it.

The Mastic Doctor team beside their liveried vans in front of an office building
Place
Shephall (SG2, SG1)
Wider area
Hertfordshire
Guarantee
12 months on our workmanship
Quote
Quoted before any work starts
Call
01277 525 020
Last updated
3 November 2026

Honest limits

Being straight saves everyone time. Fresh joints won’t solve:

  • Arranging specialist high-level access, which is planned with the client
  • Render or concrete edges that have broken away
  • Work on the window or framing system itself

If in doubt, give us a call on 01277 525 020 or email us and we will say what we think.

What we seal

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

When to call us in Shephall

New sealant run over old sealant rarely holds. Cured silicone won’t accept a new silicone bead, and the patch soon lifts.

These are often picked up first by site or facilities staff:

  • Hard, chalky sealant that no longer flexes
  • Perimeter joints where frames meet the structure
  • Facade joints cracked through the middle
  • Air leaks through failed facade joints

School extensions, at buildings such as Peartree Spring Primary School, usually run to the summer holidays, mastic included.

What to look for in a quote

  • Can the work be phased to keep areas open?
  • How they handle RAMS and site documents
  • Whether primer will be used where the manufacturer specifies it
  • Are they CHAS accredited or on Constructionline?

Our contractor checklist

Your questions answered

Can you work at a site such as Monkswood Retail Park, by Shephall?

Yes. We cover Shephall and the area around it, including industrial estates, business parks and retail parks such as Monkswood Retail Park. To start, just give us a call on 01277 525 020 or send photos by email with the unit, the joints involved and your access times.

Do you take on work at healthcare sites like Lister Hospital?

Yes. Healthcare sites are among the places we work. Work is phased so departments keep running, under the site’s own rules.

How do I request a quote?

The quote form is the simplest route, though you can also call 01277 525 020 or email us. Photos, drawings or a joint schedule help us quote quickly.

Is it fine to apply new sealant on top of old?

No. Overlaying old sealant is a frequent cause of early failure, so everything comes out first.

Can you work to our specification?

Yes. We follow the specification, along with the manufacturer’s installation guidance.

Can you fit around our working hours?

We are in the office from 8am until 5pm, Monday to Friday. Let us know your site hours and access windows, and the work will be planned around them.

Can you work in cold or wet weather?

We can work through the year, but sealant needs a dry joint and temperatures within the product’s range. Frost and condensation on glass and steel are common on winter mornings, so we plan around the forecast.

How a job runs

We bring the products specified for the job, along with primers and backing rod. Joint faces are cleaned back to sound, dry surfaces, primer goes on where the manufacturer specifies it, and each bead is tooled to a neat concave finish. For a job in Shephall, the main thing is a clear picture of the work. You’ll then get a fixed price for the work.

  1. We plan access and the order of elevations with the client.
  2. Weather and temperature are checked against the product’s limits.
  3. We remove the old bead and check the edges are sound.
  4. Joints are cleaned, primed if required and fitted with backing rod.
  5. Sealant is gunned in and tooled hard onto both faces.
  6. We hand over with our 12-month workmanship guarantee.

Getting the site ready

  • Let us know about inductions and permits
  • Share your working hours and any access restrictions
  • Clear stock, furniture or equipment away from the joints

Ask for a quote

Let us know the site, the scope and your timescale, and we’ll put a fixed quote together. The easiest way is to call the office on 01277 525 020 or send photos by email.

Get a quick quote

Read more

Facade sealing in Shephall: the local picture

Shephall is about 27 miles from central London. Towns within reach of London tend to keep building, from flats to offices and schools, and each scheme needs its mastic sealed to programme. Shephall sits in or beside Stevenage, a twentieth-century planned town. Many of its original buildings are reaching the age for recladding and new windows, with mastic packages to match.

When units on a site such as Monkswood Retail Park (to the west of Shephall) are refurbished or reclad, the panel joints and window perimeters are part of the mastic package. Extensions at sites like Lister Hospital, 2.7 miles to the north-west of Shephall, typically sit beside working departments, and the mastic follows strict access rules.

Shephall is about 1 mile south of Stevenage, in Hertfordshire. Shephall sits inside our coverage and the rest of Hertfordshire, with the same fixed quotes and 12-month guarantee as everywhere else. 371 places across Hertfordshire fall within our area, Shephall among them. We also cover London, some 27 miles away.

Work on facade joints is covered throughout SG2 and SG1, whatever the building. If your site is on Unwin Road, Oxleys Road and Burwell Road or close by, send details and we will quote for facade joints. Nearby places we also cover include Aston (1 mile east), Bragbury End (1 mile south-east), Knebworth (2 miles south), Hook's Cross (2 miles south-east) and Woolmer Green (3 miles south) for facade joints. Further afield, our area takes in Hemel Hempstead (15 miles south-west), St Albans (12 miles south-west), Bishop's Stortford (14 miles east), Welwyn Garden City (6 miles south), Harpenden (9 miles south-west) and Hitchin (6 miles north-west).

Around Shephall

Locally, jobs take us to sites close to Coopers Inn, The Heathcote School and Barnwell School, among other places. For rail, the closest station is Stevenage station, roughly 1.4 miles north-west. Nearby you will also find Benington Castle (2.6 miles east) and Lister Hospital (2.7 miles north-west). For a walk, there’s Ridlins Mire.

Map of Shephall © OpenStreetMap contributors

Maintenance after handover

Regular inspection catches problems early. In particular:

  • Share access with other external trades
  • Check the asbestos register before old mastic is disturbed
  • Note when each elevation was last resealed
  • Clear debris that holds water against joints

Record the sealant type and date on the building file. It helps when matching repairs or planning the next reseal across the elevation.

Don’t wait for a full elevation to fail. Small repairs stop small leaks becoming large ones.

How the job changes by surface

Coping and flashing joints

Sometimes the coping or flashing itself has failed. Where the issue isn’t the sealant, we say so.

Brick and stone facades

Stone can absorb plasticisers from the wrong sealant. The specified stone-compatible sealant is what we use, and mask the edges carefully.

Accreditations

Trusted. Accredited. Insured.