Knowle mastic sealing
We carry out mastic sealing for building owners, managing agents and housing associations in Knowle. Send details for a fixed quote.
- Repeated reactive repairs to the same buildings
- Failed external movement joints
- Damp patches beside frames
Need mastic sealing in Knowle?
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
Mastic sealing for commercial buildings in Knowle
Treatment starts with a proper look: which joints have failed, why, and whether sealant is the right answer. Old mastic is removed entirely, the faces prepared, primer used where the maker specifies it and new sealant tooled in and backing rod used wherever a joint is deep. Most enquiries involve the same joint failures repeated across a portfolio and window mastic that has split and shrunk, across window and door perimeters on blocks, communal kitchens and washrooms and shopfronts below residential blocks. Sealant contractors, mastic applicators, sealant specialists: whatever the job title on the order, the work in Knowle is the same: failed joints cut out, faces prepared and the right sealant laid to the right depth.
In and around smaller places like Knowle, landlords and agents often look after small groups of housing association properties, converted farm buildings and community buildings. Frame and wall-joint mastic on all of them ages and hardens.
We stand behind the joints we seal: 12 months, guaranteed. That covers our preparation and application, and we come back if anything isn’t right.
- Location
- Knowle (PO17)
- Region
- Hampshire
- Guarantee
- 12 months on every job
- Quotes
- Fixed quote, scope in writing
- Call
- 01277 525 020
- Last updated
- 3 November 2026
What we’re called out for in Knowle
UV and rain age external sealant. It stiffens, stops stretching and cracks most of all on the sunniest and most exposed elevations.
It’s worth sending us details if you spot any of the following:
- Brittle perimeter mastic across a building
- Draughts at frames across a block
- Worn sealant at communal door frames
- Damp patches beside frames
Site managers at schools like Orchard Lea Infant School can fit frame mastic into the summer works.
What your quote should include
- The named product and why it was chosen
- Can the work be phased to keep areas open?
- The terms of the workmanship guarantee
- Will failed sealant be removed rather than covered?
Towns and villages near Knowle
Also in Knowle
How a job runs
Where the site stays busy, the work is phased so only one area is out of use at a time. Each area is protected, prepared and sealed before we move to the next. Rural sites near Knowle may need directions, gate codes or a contact on site. Send that with the details and we will confirm the plan with the quote.
- We inspect each building and record the joints that have failed.
- You get a fixed quote, per block or for the whole programme.
- We agree the programme and dates with you.
- Failed sealant is removed and the faces prepared.
- Joints are resealed and tooled.
- We check the finished work and confirm the guarantee.
Before we start on site
- Share your working hours and any access restrictions
- Tell us what induction or permit system the site runs
- Warn occupants and staff about the work
Quotes
The quickest route to a quote is a few photographs and the site postcode. Send them through the quote form, or call the office on 01277 525 020 or email a schedule or drawings to discuss it first.
Advice
Planned mastic for Knowle portfolios
Rainfall across the South East, Knowle included, is lower than in many parts of the UK. Outside work still depends on dry joints, and elevations facing the sun and the prevailing weather are usually where frame mastic ages first. At about 64 miles from central London, Knowle is within reach of the capital. Around the capital’s commuter belt, managing agents look after many blocks close to stations and town centres; their frame mastic often ages block-wide.
For agents with blocks near Fareham station, which lies south of Knowle, a block-wide mastic programme deals with frames, balconies and entrances in one go. For owners of several units at places like Knowle Village Business Park (under half a mile north-west of Knowle), one programme can deal with frame and external mastic across the lot.
Knowle is about 2 miles north of Fareham, in Hampshire. If you’re looking for mastic sealing in Knowle, we can help. Across Hampshire, 723 places are covered, including Knowle. Our Portsmouth page has more on work in that area, about 7 miles away.
Work on mastic joints is covered throughout PO17, for business premises of every kind. If your site is on Serotine Close, Boundary Walk and Park Approach or close by, send details and we will quote for mastic joints. We also cover Funtley (1 mile south), Tapnage (1 mile north-west), Heathfield (2 miles south), Segensworth (2 miles west) and Titchfield Park (2 miles south-west). Further afield, our area takes in Winchester (13 miles north), Gosport (6 miles south-east), Havant (10 miles east), Eastleigh (9 miles north-west), Horndean (9 miles east) and Totton (13 miles west).
Around Knowle
In Knowle, that means premises near The Miners Arms and The Henry Cort Community College. Knowle’s nearest station is Fareham station, about 2 miles south of the centre. Nearby you’ll also find Portchester Castle (4.9 miles south-east) and Knowle Hospital (under half a mile north-east). For a walk, there’s Portsdown Hill and Swanwick Lakes.
When something else is needed
Sealant solves a lot, but not everything, and we’d rather tell you before you spend money. These need a different solution:
- Materials that need asbestos testing before work
- Water coming in from the roof or rainwater goods
- Frames that are rotten, warped or broken
If you’re not sure, just ring 01277 525 020 or send details through our quote form and we’ll give you a straight answer.
Joints and surfaces we work on
- Communal entrances and stairwells
- Balcony and threshold joints
- External wall and movement joints
- Shopfronts below residential blocks
- Communal kitchens and washrooms
- Window and door perimeters on blocks
What happens if it’s left?
Sealing over failed mastic looks tidy for a while. It won’t grip the old sealant and soon comes away. Cutting out and resealing properly does it once. One visit to deal with every failing joint makes more sense than several trips to a place like Knowle, rather than one at a time. Photos of every joint help us quote for the whole job.
Small jobs and large programmes are priced from the same things: scope, access, product and programme. Call for a quote, and you will have a fixed figure to work with.
Why choose Mastic Doctor in Knowle
- Fully insured
- Standard and matched colours in many product ranges
- Workmanship guaranteed for 12 months
- Sealing commercial buildings since 2005
Read what affects the cost or our accreditations and insurance.
Surface by surface
Tenement and older buildings
Natural stone can be marked by the wrong sealant, so we pick a grade that won’t mark it.
External movement joints
Brickwork, blockwork and panel joints let a building move. Failed sealant in a movement joint lets water in.
Cost factors for mastic joints
To price the job, we consider:
- Travel to remote or island sites
- Backing rod, priming and other preparation
- Removal of failed or old sealant
- Site requirements such as inductions and permits
What a job costs comes down to how many linear metres there are, what has to come out first and how the joints are reached. Call for a fixed quote once you have the details.
Before you send an enquiry
Good information means a firmer quote. When you get in touch, include:
- Access details, including height
- Any dates the work must fit around
- A wide shot and a close-up of the area
- Whether the building will be occupied during the work
We quote a fixed sum against the scope you give us, so you know the figure before anyone is on site. To ask for one, speak to us on 01277 525 020 or send details through our quote form.
Your questions answered
Can you quote for a block close to Fareham station?
Yes. Managing agents, landlords, property factors and housing associations are who this service is for. Send the address, photographs of the elevations and your access arrangements, and we’ll give a fixed quote.
Does your area include sites such as Knowle Village Business Park, near Knowle?
Yes. Our area takes in Knowle and its surroundings, with estates and business parks such as Knowle Village Business Park included. A few photographs and the unit address let us price the work.
Is it fine to apply new sealant on top of old?
No. Overlaying old sealant is a frequent cause of early failure, so it all comes out first.
What if the old mastic contains asbestos?
We don’t remove asbestos-containing materials. If old sealant is suspected, work stops until it’s tested, and the duty to manage asbestos sits with the dutyholder.
Can you plan resealing across several buildings?
Block-wide and estate programmes are common. The quote can be split however suits your budgeting.
When can the area be used after sealing?
That comes down to the sealant and the temperature. Some products skin over quickly but need longer to cure fully, and we confirm it before leaving site.
Can you work to our specification?
Yes. Include it with the drawings when you ask for a quote, and we will price the work to it, flagging anything that needs clarifying.