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

Expansion and movement joint sealing in High Cross, Hertfordshire

Need expansion joint sealing in High Cross? It’s simple: send details, get a quote, we seal, guaranteed.

  • Expansion joints filled with dirt and stones
  • Arrises breaking up along floor joints
  • Rain penetration at brick or block movement joints
1
Send details
Drawings, photos, a joint schedule or a site visit.
2
Get a quote
One fixed quote covering the agreed scope.
3
We seal
Prepared joints, the specified product, a tidy finish.
4
Guaranteed
Our workmanship is guaranteed for 12 months.
Covering the South East & Scotland
CHAS accredited
£5m public liability

Expansion joint sealing for businesses in High Cross

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

Our process

We follow your site rules from the start: sign-in, induction and whatever permit system the building uses. Once we’re cleared to begin, the joints are worked through in the order agreed with your site contact. For work around High Cross, we aim to finish in one visit, so photographs and measurements up front really help. That way the right products come on the day.

  1. First the joints are inspected, widths measured and the type of failure noted.
  2. A fixed quote names the sealant we propose and its movement class.
  3. Where areas have to stay open, we agree a phased sequence before starting.
  4. The failed seal is cut out and both joint faces cleaned back to sound material.
  5. Depth is controlled with backing, the faces are primed where the maker calls for it, then the bead is laid and tooled.
  6. We check each joint with you, confirm the cure time and sign off under our 12-month guarantee.

Preparing the site

  • Tell us your opening times and when work is allowed
  • Let us know about inductions and permits
  • Warn occupants and staff about the work

Get a fixed quote

For a fixed quote, call 01277 525 020 or email a schedule or drawings, telling us the site location and the nature of the job. You can also send details through our quote form.

Get a quick quote

Read more

Expansion joint sealing for commercial buildings in High Cross

Joints in car park decks and ramps are among the hardest-working in any building. Wheel loads, grit and de-icing salts attack the seal and the concrete either side. We reseal deck and ramp joints with a trafficable sealant chosen for the movement. We work on car park decks and ramps, brickwork movement joints and blockwork control joints, and the usual reasons a site gets in touch are brittle, chalky sealant on external joints and arrises breaking up along floor joints. Most enquiries from High Cross start with one failed joint and grow into a wider look at the building: we check the joints around it and give you an honest view of what needs doing now and what can wait.

Smaller community and commercial buildings around High Cross have their own movement joints in walls and floors. They tend to be overlooked until something leaks or cracks.

Whoever the client is, the cover is the same: a 12-month guarantee on our workmanship. Faults in the structure, damage and other trades’ work fall outside it, and we say so plainly.

The Mastic Doctor team beside their liveried vans in front of an office building
Location
High Cross (SG11)
Region
Hertfordshire
Cover
12 months on every job
Quote
Quoted before any work starts
Phone
01277 525 020
Page updated
3 November 2026

When to call us in High Cross

Sealant peeling cleanly off one side is an adhesion failure. Dusty, damp or contaminated faces, a missing primer and three-sided adhesion are the usual causes, and it’s common on joints sealed in a hurry.

What tends to prompt an enquiry:

  • Hardened, cracked sealant on exposed facades
  • Spalled or broken joint edges in floors and decks
  • Joints where the bead has lost adhesion
  • Torn sealant in brick or block movement joints

For a school such as Thundridge Church of England Primary School, playground and building joints can be done in the holidays.

Questions to ask before you book

  • How the existing material will be dealt with
  • What level of public liability insurance do they hold?
  • How the joint faces will be prepared and primed
  • Is the sealant right for the movement and the substrate?

How to choose a sealant contractor

Doing it in-house

Some joints are best left to specialists: for example fire-rated seals that must match a tested detail, trafficked floor joints and external movement joints. Getting these wrong typically costs more in the end than doing them right.

There’s also the paperwork. Many sites expect CSCS cards, RAMS and proof of insurance, and we will confirm the paperwork you need with the quote.

Looking after the joints

Your facilities or cleaning team can help the joints last. Pass these on to them:

  • Reopen bays and walkways only after the stated cure time
  • Check joints after long freezing spells
  • Keep stones and debris out of open joint lines
  • Raise snow-clearing blades over deck joints where possible

Every joint we seal is backed by a 12-month guarantee on workmanship. Record which product went into which joints in the building file.

Unsupported floor joint edges spall under forklift and pallet-truck wheels. Broken arrises jolt trucks, loads and drivers and the broken length grows with every pass. Keeping the filler or sealant sound protects the floor.

High Cross: questions and answers

Is a smaller place like High Cross outside your area?

Not at all: smaller places are covered as well as towns. We work across Greater London and the South East. We plan jobs in smaller places so return trips are kept to a minimum.

Can you take on a job at a hospital such as Hertford County Hospital?

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

What hours do you work?

Mention the site’s hours and access windows in your enquiry, and we’ll plan around them. Our office runs Monday to Friday, 8am until 5pm.

Are expansion joints and movement joints the same thing?

The terms overlap a great deal. Both let materials grow and shrink with temperature, moisture and load.

What guarantee do you give on joint sealing?

It’s backed by our 12-month guarantee. If a joint we sealed fails inside the 12 months, let us know.

What timescale should we allow for resealing expansion joints?

It normally takes a few hours to several weeks, depending on how many metres of joint there are and how much old sealant or filler needs removing and phased work can stretch that to suit your site. Cure time before reopening is confirmed on the day.

Why has the sealant in our expansion joints split?

Normally the joint is moving more than the sealant can take. We review the joint design as well as the sealant before pricing so the same failure isn’t repeated.

Different surfaces, different methods

Cladding panel joints

Access to cladding joints is agreed before the price is fixed. Close-up photographs help us judge the joints, or we visit if they don’t show enough.

Concrete and precast panel joints

Joints between precast panels open and close with temperature and loading. We use a sealant classed for the movement, laid over backing to depth.

For managing agents and facilities managers

We work for building owners and managing agents on sealant work across single buildings or whole portfolios. Several sites can go on one quote, so there’s one set of paperwork to deal with.

CHAS accredited and a Constructionline member, we make supplier vetting simple. We are fully insured, and our insurance certificate can go with the quote.

Warehouse floors and decks around High Cross

At about 24 miles from central London, High Cross is within reach of the capital. The South East has large numbers of industrial estates and warehouses along the motorway corridors. The 3 miles around High Cross take in at least three named trading estates, business parks or retail parks. Their warehouses, yards and car parks are exactly where joints take the most punishment.

At places like Ermine Point Business Park (2.2 miles south-west of High Cross), joints are sealed a section at a time so operations carry on. Parks like Thundridge Business Park (1 mile south-west of High Cross) combine paved areas, car parks and building elevations, each with joints that move.

High Cross is about 2 miles north of Ware, in Hertfordshire. Across the SG11 postcode area, it works the same way: send details, get a fixed quote, we seal, and the work is guaranteed. High Cross is one of 371 places we cover in Hertfordshire for movement joints. There’s a separate page for London, roughly 24 miles from High Cross.

Work on movement joints is covered throughout SG11, whatever the building. For a building on North Drive, Chestnut Grove and Poplar Close or nearby, send details and we’ll quote for movement joints. Close to High Cross, our area also takes in Wadesmill (1 mile south-west), Standon Green End (1 mile north), Thundridge (1 mile south), Cold Christmas (1 mile south-east) and Barwick (1 mile north-east). Bigger towns within reach include Stevenage (8 miles north-west), St Albans (15 miles south-west), Bishop's Stortford (8 miles east), Welwyn Garden City (8 miles south-west), Harpenden (14 miles west) and Hitchin (13 miles north-west).

Around High Cross

Recent enquiries here include premises near The White Horse Inn, among other places. High Cross’s nearest station is Ware station, roughly 2.8 miles south. Other landmarks nearby include Museum of Street Lighting (3.4 miles south) and Hertford County Hospital (4.6 miles south-west). The countryside around High Cross includes King's Meads.

Map of High Cross © OpenStreetMap contributors
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