Expansion Joint Sealing in How Wood
Expansion and movement joint sealing in walls, decks and floors in How Wood. CHAS accredited, Constructionline member, with a 12-month guarantee on workmanship.
- Spalled or broken joint edges in floors and decks
- Previous reseals laid over old sealant
- Torn sealant in brick or block movement joints
Expansion joint sealing for businesses in How Wood
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
Common problems we fix in How Wood
Sometimes the sealant holds but the substrate breaks away. Weak or crumbling concrete, brick or render edges give the sealant nothing sound to grip.
Clients normally get in touch after noticing one or more of the following:
- Previous reseals laid over old sealant
- Torn sealant in brick or block movement joints
- Car park joints leaking onto vehicles below
- Debris jammed in movement joints
Business parks such as North Orbital Commercial Park, 1.8 miles north-east of How Wood, have car parks, paved areas and long brick and panel elevations, all with movement joints.
What to look for in a quote
- Are they CHAS accredited or on Constructionline?
- What level of public liability insurance do they hold?
- Whether their applicators hold CSCS cards
- Is the sealant right for the movement and the substrate?
Expansion joint sealing in How Wood
Mastic Doctor has sealed movement joints since 2005. CHAS accredited, Constructionline member, CSCS-carded applicators and five million pounds of public liability insurance. Workmanship is backed by our 12-month guarantee. Site teams most often ask us about chipped joint edges on forklift routes and water getting into the wall through a failed joint, across podiums and floor movement joints, cladding panel joints and blockwork control joints. A specialist sealant contractor works differently from a general builder: in How Wood, that means joint design, primers and backing rod as standard.
Around places the size of How Wood, joints that need sealing tend to be in rural business units, farm buildings put to commercial use, schools and community buildings. Their slabs and walls still need movement joints that work.
The 12-month guarantee is for workmanship rather than wear and tear. Sealant wears with time, and movement, weather, cleaning and use decide how fast, so we are clear about what is covered before work starts.
- Location
- How Wood (AL2)
- Wider area
- Hertfordshire
- Guarantee
- 12 months on every job
- Quote
- Fixed quote, scope in writing
- Phone
- 01277 525 020
- Updated
- 3 November 2026
What affects the price in How Wood
There’s no standard rate for sealant work, because every site is different. What we take into account:
- Joint width, depth and condition
- How much there is to seal
- Which sealant the job calls for
- Travel to remote or island sites
No two sites price the same: joint size, product, access and site hours all play a part. A fixed quote follows once we understand the job.
What we need to price the job
A good diagnosis starts with the right details. Tell us:
- Rough lengths or quantities, or drawings if you have them
- Clear photographs of the problem areas
- The site address and postcode
- What the building is and how it’s used
Send us photographs, drawings or a joint schedule and a fixed quote comes back to you. Where a site visit makes more sense, we will arrange one.
Expansion joint sealing in How Wood: the local picture
How Wood lies roughly 19 miles out from central London. The South East has large numbers of industrial estates and warehouses along the motorway corridors. How Wood is in the South East, one of the UK’s drier regions. Outside joints in yards and car parks still have to be dry before sealing, and gritting in cold spells finds its way into open joints.
Large sites such as Kingsley Green Hospital, 2.2 miles south-east of How Wood, have car parks, service roads and long elevations with movement joints in brick and panels. Another example is Verulam Industrial Estate, 2 miles north-east of How Wood, where floors and yards would be done in stages around the occupiers.
How Wood is about 2 miles south-west of St Albans, in Hertfordshire. Across the AL2 postcode area, it works the same way: send details, get a fixed quote, we seal, and the work is guaranteed. We work across 371 places in Hertfordshire. London is covered too, around 19 miles from How Wood.
Work on movement joints is covered throughout AL2, whatever the building. Buildings on Ringway Road, Alder Close and How Wood are within our area for movement joints. We also cover Park Street (1 mile north-east), Chiswell Green (1 mile north-west), Frogmore (1 mile east), Bricket Wood (1 mile south-west) and Colney Street (1 mile south-east) for movement joints. Bigger towns within reach include Watford (4 miles south-west), Hemel Hempstead (5 miles north-west), Stevenage (15 miles north-east), Welwyn Garden City (9 miles north-east), Harpenden (7 miles north) and Hoddesdon (15 miles east).
What’s near How Wood
We work on buildings around Marlborough Science Academy and The Falcon pub, among other places. How Wood has its own railway station: How Wood station. Nearby you’ll also find Hilfield Castle (4.6 miles south) and Hypocaust Museum (2.1 miles north). Green spaces nearby include Broad Colney Lakes and Verulamium Lake.
What happens if it’s left?
Re-sealing with the same product that failed is often a false economy. A higher movement class, or a design change by the engineer, may be needed, and we will say so before quoting. For buildings in places like How Wood, one well-planned visit beats several small ones, so we’d suggest renewing all the joints that are going, not just the worst.
Larger quantities, tricky access or phasing all shape the price. Site requirements like inductions and permits play a part as well.
What you get with us
- Work carried out by CSCS-carded applicators
- Colour options checked against the specified product
- Joints cleaned back to sound surfaces
- Health and safety: CHAS accredited
See what affects the cost and our accreditations.
Work for main contractors and building owners
FMs need a contractor who is easy to get on site. Let us know the documents you need (RAMS, insurance certificate, CSCS details) and we will confirm them with the quote.
Hospitality, education, healthcare, office and retail clients come to us directly as well. We plan around the way the building is used, so the building keeps working while we do.
Common questions from How Wood clients
Can you take on a job at a hospital such as Kingsley Green Hospital?
Yes. We work in healthcare settings as well as offices and schools. The estates team’s permit system and infection-control rules come first, and the work is planned around them.
Will you take on work at estates like North Orbital Commercial Park, close to How Wood?
Yes, sites like North Orbital Commercial Park are within our area, along with the rest of How Wood. Send details of the unit and the work through our quote form for a quick quote.
Is any job too small?
Single areas, one-off repairs and whole buildings are all quoted the same way: details, then a fixed price, then sealing, then a 12-month guarantee.
Do you seal on top of existing sealant?
No. Failed sealant is removed and the faces cleaned back to sound, dry material first, because fresh silicone will not bond with aged silicone.
Can you work on car park ramps and decks?
Yes. Deck and ramp joints are resealed with a trafficable sealant chosen for the movement with bays phased so the car park keeps operating.
Does weather matter for sealant work?
It can, for external work. Wet joints and cold, damp or frosty conditions stop the sealant bonding properly, so we watch the forecast and rearrange outside work if we have to. Indoors, the weather is rarely a problem.
Are your applicators CSCS-carded?
Yes. Should the site need card details in advance, let us know and we will send them with the quote.
Other services in How Wood
Diagnose, treat, sign off
Occupied buildings need a little choreography. We sign and contain the area we’re in, with routes through the building left open and work section by section so the rest of the building stays in use. Work in places the size of How Wood is planned as a single visit where we can. Photos with rough sizes let us arrive with everything needed.
- Photos, joint lengths and drawings come to us, or we visit.
- Joint widths and expected movement are checked against what the sealant can take and tell you if the design looks wrong for the movement.
- Old sealant and debris are cut out of every joint.
- Any broken arrises or friable edges are flagged before work goes further.
- A sealant suited to the movement and traffic is laid to depth and tooled.
- Each area is handed back after its cure time, under our 12-month guarantee.
Preparing the site
- For older buildings, check the asbestos register before work
- Send your site hours and access windows
- Flag any permit to work we’ll need
Getting a fixed quote
Every job follows the same four steps: send details, get a quote, we seal, guaranteed. To take the first step, call the office on 01277 525 020 or email a schedule or drawings.
Related advice
After the work
To get the most from the new sealant:
- Include every elevation and deck joint in periodic inspections
- Keep scrapers and ploughs from dragging across joint sealant
- Keep traffic off new joints until the cure time is up
- Report split or peeling joint sealant early
Our workmanship on movement joints carries a 12-month guarantee. Record which product went into which joints in the building file.
Joints sealed at the same time generally fail around the same time. It pays to check every joint, not just the obvious one, so the work can be planned rather than rushed. We can suggest an order, worst joints first.