Facade Sealing in Fortis Green
Facade sealing for Fortis Green, from a contractor working since 2005. Fully insured, with a 12-month guarantee.
- Perimeter sealant that has split or peeled away
- Air leaks through failed facade joints
- Perimeter joints where frames meet the structure
Facade sealing for Fortis Green sites
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
Questions we’re asked in Fortis Green
Can you take on a job at a hospital such as Nuffield Health Highgate Hospital?
Yes, provided the work is planned with the site’s estates team. We follow the site’s permits, sign-in and infection-control procedures in every area.
Do you take on jobs in Fortis Green where loading and access are tightly controlled?
Yes, most London buildings have access rules of some kind, and we plan around them. Share the building’s contractor rules and we’ll work to them. All of Greater London is inside the ULEZ, and our planning allows for it
Which sealant will you use?
The specification comes first, if there is one. Without one, the joint decides: its movement, its surfaces and what it has to cope with.
Do you run new sealant over the existing bead?
No. A bead run over old sealant soon lifts. Our method is a full cut-out, cleaning, backing and a new bead.
Will you check whether the sealant is causing the leak?
Yes. We check the sealant joints and report what we find before quoting. Where the cause seems to be elsewhere, we’d rather tell you than reseal pointlessly.
What about RAMS and site documents?
Requirements differ from site to site, so list what you need, whether RAMS, insurance or CSCS details, and we’ll confirm with the quote.
What type of sealant goes on window perimeters?
Most facade and window perimeter joints take a low-modulus neutral-cure silicone. Hybrid or MS polymer, polyurethane and polysulphide sealants suit others.
Facade sealing for commercial buildings in Fortis Green
External joints face UV, rain, temperature swings and building movement all year, so they don’t last indefinitely. How long a joint lasts depends on the movement it takes, its exposure, the product and how well it was installed. When the time comes, we cut the old sealant out completely and start again. If you have cold air coming in at window perimeters and previous reseals run over old sealant, we can put it right. Most enquiries from Fortis Green start with one failed joint and grow into a wider look at the building: we look at the rest while we are there and tell you what we find.
Construction in a London area such as Fortis Green means working on constrained sites: small compounds, delivery slots and shared hoists and scaffold. We fit around the programme, sealing each elevation or floor as other trades hand over.
Every job ends the same way: guaranteed. You get a 12-month guarantee on our workmanship, and we explain exactly what that covers when we quote.
- Place
- Fortis Green (N10, N2, N6)
- Region
- Greater London
- Guarantee
- 12 months on our workmanship
- Quotes
- Fixed quote, scope in writing
- Phone
- 01277 525 020
- Updated
- 3 November 2026
Surface by surface
Brick and stone facades
Stone can absorb plasticisers from the wrong sealant. We use a product suitable for the stone where the specification names one, and mask the edges carefully.
Cladding panel joints
Joints between cladding panels open and close with temperature. We use a product rated for the movement and suited to the panel surface, as the specification sets out.
When to call us in Fortis Green
When the sealant tears down its centre, it has usually been asked to move more than it can. Too thin a bead, too narrow a joint or a product with the wrong movement class are common reasons.
What tends to prompt an enquiry:
- Facade joints cracked through the middle
- Water coming in around window frames
- Cladding panel joints that have opened up
- Old perimeter mastic that has dried out
For a contractor at a hotel such as National Hotel, which lies east of Fortis Green, the mastic often has to be finished before a reopening date.
Before you book anyone
- Will CSCS-carded applicators be on site?
- How the joint faces will be prepared and primed
- How joint depth will be controlled
- Their public liability cover
Towns and villages near Fortis Green
More services for Fortis Green
Why deal with it now?
Each spell of rain drives water past a failed facade joint. The damage builds out of sight: wet linings, rusting fixings, staining and spoiled finishes. Resealing now costs less than repairing interiors later. In Fortis Green, each extra visit means more notices, permits and disruption, so a proper job first time, with the old sealant fully removed, is worth it.
The product called for affects the cost, as does the preparation each joint needs, such as cutting out, priming or new backing rod. Access, phasing and site rules also count.
Why choose Mastic Doctor in Fortis Green
- Colour agreed before work starts
- Health and safety: CHAS accredited
- 12-month guarantee on workmanship
- One phone line for London, the South East and Scotland
From enquiry to sign-off
We schedule the visit to fit the site hours and access windows you give us. While we’re working, the area stays contained and tidy, and your contact hears from us before we move to the next area. In Fortis Green, most buildings stay in use during the work, so we agree zones and timings with the building or facilities manager. Phased work keeps the rest of the building in use.
- We look at the joints, the drawings and the access before pricing.
- Failed sealant is cut out along its full length.
- Joint faces are cleaned to firm, sound material, with primer where the sealant maker specifies it.
- Closed-cell rod fixes the depth, and the sealant grips two sides only.
- The new sealant goes in and is tooled firmly onto both faces.
- The completed runs are checked with you, then the 12-month guarantee applies.
Before we start on site
- Send any specification or drawings in advance
- Arrange parking or a loading space
- Tell us which areas need to stay in use
Getting a fixed quote
Photos, drawings or a schedule of the joints are often enough for a fixed quote. If the job needs a look first, we will arrange a site visit.
Advice
How the quote is worked out
The price varies from site to site. It mainly depends on:
- Induction, permit and paperwork requirements
- Access and working height
- How much there is to seal
- Which sealant the job calls for
Small jobs and large programmes are priced from the same things: scope, access, product and programme. Call for a quote, and you’ll have a fixed figure to work with.
Before you send an enquiry
It doesn’t need to be a full survey. These details are enough to start:
- Where the site is, with the postcode
- Any dates the work must fit around
- Specification clauses that apply
- A wide shot and a close-up of the area
Send details, get a quote, we seal, guaranteed: that’s how every job runs. To take the first step, ring 01277 525 020 or send details through our quote form.
Building and refurbishing in Fortis Green
The area within 2 miles of Fortis Green holds plenty of hotels. Hotel extensions and refits usually have to fit around bookings, so mastic dates are tight. As part of Greater London, Fortis Green is inside the ULEZ, which applies to every van on site. Add booked deliveries and tight storage, and the mastic package needs planning with the site team.
Building work at universities like American University in London (2.7 miles south-east of Fortis Green) is often timed for the summer, mastic included. Recladding or extending a unit at a site like Friern Bridge Retail Park, 1.4 miles north of Fortis Green, brings panel joints and frame perimeters into the programme.
Fortis Green is about 1 mile south-east of Finchley, in Greater London. Fortis Green sits inside our coverage, and jobs here get the same fixed quote and 12-month guarantee as anywhere else. We work across 764 places in Greater London, large and small. There’s a separate page for London, about 7 miles away.
We take on facade joints across the N10, N2 and N6 postcode area, for business premises of every kind. Streets here include Hill Road, Durham Road and Steeds Road. With the A504 nearby, Fortis Green is straightforward for us to reach. Close to Fortis Green, our area also takes in Muswell Hill (1 mile east), East Finchley (1 mile west), Highgate (1 mile south), Crouch End (1 mile south-east) and Hampstead Garden Suburb (2 miles south-west). Nearby towns on our patch include London (7 miles south), City of Westminster (5 miles south), Marylebone (5 miles south), Kensington (7 miles south), St Pancras (5 miles south) and Shoreditch (6 miles south-east).
Near you in Fortis Green
In Fortis Green, that means premises near Tollington School, Cherry Tree Wood and The Clissold Arms. For rail, the closest station is Alexandra Palace station, about 1.4 miles east of the centre. Other landmarks nearby include Kenwood House (1.6 miles south-west) and Grand Arcade (1.8 miles north-west). Green spaces nearby include Highgate Hill and Glebelands Local Nature Reserve.
Aftercare for building managers
Every sealant joint needs some looking after, and how long they last depends on how they’re treated. Our advice:
- Share access with other external trades
- Add perimeter sealant to planned maintenance checks
- Note when each elevation was last resealed
- Check the asbestos register before old mastic is disturbed
Keep gutters, sills and drainage paths clear. Sealant copes better when water runs off the facade as designed instead of soaking the joints.
Use each reseal to correct the joint: the right width, backing rod and a sealant with enough movement capability. Repeating a faulty detail just repeats the failure.