Facade and window perimeter sealing in How Wood, Hertfordshire
Facade sealing in How Wood, backed by over 20 years in commercial sealing. Fully insured and CHAS accredited.
- Previous reseals run over old sealant
- Cladding panel joints that have opened up
- Old perimeter mastic that has dried out
Facade 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.
Work for main contractors and building owners
Whether you are a managing agent, a property factor or an owner’s representative: send the details, accept a fixed quote, and we carry out and guarantee the work. We can agree access arrangements and keyholder contacts beforehand.
Main contractors use us as their sealant subcontractor on new-build and refurbishment projects. Programme, specification and site rules come first.
Facade sealing in How Wood
External joints face UV, rain, temperature swings and building movement all year, so they don’t last indefinitely. Life depends on movement, weathering, product choice and the quality of the original work. When the time comes, we cut the old sealant out completely and start again. We work on window and door perimeters, cladding panel joints and perimeter joints where frames meet the structure, and the usual reasons a site gets in touch are old perimeter mastic that has dried out and weathered joints at frame-to-structure perimeters. A single leaking joint is often how a building in How Wood first comes to us: we look at the rest while we’re there and tell you what we find.
Building work in places the size of How Wood is normally small-scale: a handful of new houses, barn conversions, a school or hall extension. Even a small site needs its perimeter and facade joints sized, backed and sealed properly.
We stand behind the joints we seal with a 12-month guarantee. That covers our preparation and application, and we come back if anything isn’t right.
- Location
- How Wood (AL2)
- Wider area
- Hertfordshire
- Cover
- A 12-month guarantee
- Quote
- Quoted before any work starts
- Phone
- 01277 525 020
- Updated
- 3 November 2026
Why it’s worth doing now in How Wood
Patch repairs over old sealant tend to come back. A full cut-out and fresh bead is the repair that holds. Sealant hardens, cracks and loses grip with age, UV and movement. Replacing it before it fails keeps water out.
What a job costs comes down to how many linear metres there are, how much old material needs removing and the access. Call for a quote once you have the details.
Why choose Mastic Doctor in How Wood
- Constructionline member
- Colour options checked against the specified product
- Fully insured, including public liability cover
- Old sealant cut out, never sealed over
See our cost guide or our accreditations.
Nearby places to How Wood
What else we do in How Wood
Honest limits
A few problems need another trade or a different fix, and we point that out rather than sealing over them:
- Leaks from roofs, gutters or failed flashings rather than sealant joints
- Damaged frames that need replacing
- Providing access systems for the work
Not sure which it is? You can call the office on 01277 525 020 or email us and we will tell you honestly.
Surfaces we seal
- Window and door perimeters
- Coping and flashing joints
- Stone and brick facade joints
- Shopfront frames
- Cladding panel joints
- Perimeter joints where frames meet the structure
Building and refurbishing in How Wood
A 2-mile radius around How Wood takes in a number of hotels. Hotel extensions and refits typically have to fit around bookings, so mastic dates are tight. At about 19 miles from central London, How Wood is within reach of the capital. Building activity in the commuter belt runs from new flats near stations to business park refurbishments, so mastic packages have to keep pace with busy programmes.
For contractors at a school such as How Wood Primary and Nursery School, sealing has to be finished before term starts. Historic houses such as High Elms Manor (2.2 miles south-west of How Wood) are a reminder of the older buildings in the wider area, where sealing against old stone, brick or timber needs compatible products.
How Wood is about 2 miles south-west of St Albans, in Hertfordshire. Looking for facade sealing in How Wood? We can help. How Wood is one of 371 places we cover in Hertfordshire for facade joints. Our London page has more on work in that area.
Anyone looking for facade sealing in AL2 gets the same process as the rest of our area: send details, get a quote, we seal, guaranteed. Streets here include Ringway Road, Alder Close and How Wood, and sites on any of them can send details for a fixed quote. If your building is just outside How Wood, we 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). 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).
Landmarks near How Wood
Locally, jobs take us to sites close to Marlborough Science Academy and The Falcon pub. How Wood has its own railway station: How Wood station. Well-known places in the area include Hilfield Castle (4.6 miles south) and Hypocaust Museum (2.1 miles north). Not far away are Broad Colney Lakes and Verulamium Lake.
Questions about How Wood
Can you work on a hospital site such as Kingsley Green Hospital?
Yes, healthcare and care buildings are part of our work. The estates team’s permit system and infection-control rules come first, and the work is planned around them.
Is How Wood too far out for you?
Not at all: smaller places are covered as well as towns. We cover Greater London and the counties of the South East. Send photos and a list of what needs doing, and we will plan the job to need as few trips as possible.
Do you offer coloured sealant?
That depends on the product. Some ranges offer many colours, others very few, so the available colours are confirmed with the quote.
Is any job too small?
Single areas, one-off repairs and whole buildings are all quoted the same way: send details, get a fixed quote, we seal, guaranteed.
Are you fully insured?
Yes. Our insurance certificate can be sent alongside the quote.
Do we need an asbestos check before resealing?
For older buildings, yes, check before work starts. The duty to manage asbestos sits with the dutyholder. Suspect material is left alone until it has been tested.
Can the building stay open while you work?
In most cases, yes. Phased work can be planned so areas stay in use, with each area protected and signed.
Do you need facade sealing in How Wood?
A frequent fault is a bead stuck to the joint’s rear face as well as its sides. Without rod or bond-breaker tape, the bead is held back.
Look out for the following:
- Previous reseals run over old sealant
- Air leaks through failed facade joints
- Leaks at window and door perimeters
- Discoloured or dirty facade joints
Extensions at sites like Kingsley Green Hospital, 2.2 miles to the south-east of How Wood, normally sit beside working departments, and the mastic follows strict access rules.
Questions to ask before you book
- Whether old or failed sealant will be cut out, not overlaid
- Will CSCS-carded applicators be on site?
- How they handle RAMS and site documents
- The named product and why it was chosen
What sets the cost
We price every job individually. The things that drive the figure:
- The size and state of each joint
- How much existing material needs removing
- Site requirements such as inductions and permits
- The product specified
Access often affects the price as much as the sealing: joints within easy reach take less time than ones that need access equipment. Mention the access as part of your enquiry.
What to include in your enquiry
Whether it’s one area or a whole building, these details speed things up:
- Access details, including height
- Whether an asbestos survey exists
- Clear photographs of the problem areas
- Specification clauses that apply
Tell us about the building, the joints and when you need the work done, and a fixed quote will follow. The easiest way is to phone 01277 525 020 or email a schedule or drawings.
On site: what to expect
Tell us your site hours and access windows and we’ll plan around them. While we are working, the area stays contained and tidy, and we check in with your contact before moving on to each new area. What matters most for a job in How Wood is a clear list of what needs doing, so send photos of each area. A fixed quote follows.
- We look at the joints, the drawings and the access before pricing.
- Failed sealant is cut out along its full length.
- Both faces are cleaned and, where the product needs it, primed.
- Backing rod, or bond-breaker tape in shallow joints, limits the depth.
- A facade-grade sealant rated for the movement goes in, tooled to a concave profile.
- The completed runs are checked with you, then the 12-month guarantee applies.
Before we start on site
- For older buildings, check the asbestos register before work
- Tell us your opening times and when work is allowed
- Tell us which areas need to stay in use
Get a fixed quote
For a fixed quote, speak to us on 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.