Medway · England
Walderslade Window Mastic
Window and door frames in Walderslade need attention? We cut out the old, prepare the joints and apply the right sealant, with a one-year guarantee.
- Water coming in at the bottom corners of a door
- Gaps between the frame and the inside reveal
- Rushed sealant from a window installation
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.
How we handle window mastic in Walderslade
Every window and door frame has a gap around it, and mastic is what closes it. Once that seal fails, wind and rain find the gap. Our applicators cut it out and replace it with a flexible, weatherproof sealant. Typical jobs include gaps between the frame and the inside reveal and sealant in the wrong colour for the frame, across composite doors, patio & French doors and aluminium frames.
In a smaller place like Walderslade, some walls face open ground and catch the full force of the weather, so exposed windows and doors face the weather head on. That’s hard on the mastic around frames and sills.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we will put it right.
- Where
- Walderslade (ME5)
- Wider area
- Medway
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Different surfaces, different methods
uPVC windows
uPVC expands and contracts noticeably with temperature, so we use a flexible, low-modulus sealant. White is the usual colour, with brown, anthracite grey and black for coloured frames.
Timber windows & doors
Where timber has rotted at the joint, it needs repairing first. If we find rot, we’ll tell you before going ahead, as that is a job for a joiner.
Walderslade: your questions answered
Can you help a landlord with a rental near Chatham station?
Yes, we work for landlords and letting agents. Just phone 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear price.
Will you come out to Walderslade?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Can you quote for more than one area?
Yes. Tell us about everything you’d like done.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Will it make a mess?
We keep the work tidy. Nearby surfaces are protected, and we clear up when we’re done.
Will the old sealant be removed?
Yes. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
Can you seal over the old sealant?
No. New silicone won’t bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Where is Mr Mastic based?
We are a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
Landlord and commercial work in Walderslade
We also work for property managers and facilities teams in Walderslade and across Medway. We can quote a run of properties together, and we are fully insured for the work.
Hotels need rooms back in use, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Aftercare tips
How long the joints last depends on use and care. Here’s what we suggest:
- Do not use solvent cleaners on the joint
- Clear any debris from frame drain holes
- Don’t paint over the silicone
- Keep jet washers away from the mastic
Silicone can’t generally be painted, so if you are planning to paint the frames or walls, tell us beforehand. There are paintable sealants for joints that need it.
A small gap around a frame only grows. As the old mastic shrinks further, more air gets through, and a cold room gets colder. A new joint closes it up.
Towns and villages near Walderslade
What else we do in Walderslade
Why it’s worth doing now in Walderslade
Running fresh sealant over the old joint is tempting, but new sealant can’t bond to old, crumbling mastic. It peels before long, and water still gets in behind. Proper resealing starts with removing the old joint. Homes in smaller places like Walderslade can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
Leaving a failed joint generally makes the job bigger, not smaller, because water and mould keep working on it. If you’re not sure whether it needs doing, ring 0345 464 0079 or send us an email for an honest opinion and a quote.
Why choose Mr Mastic in Walderslade
- Colour agreed with you before any work starts
- One-year guarantee on every job
- ARBOMaster approved applicator
- 180+ five-star Google reviews
See how sealant jobs are priced and our reviews.
Window mastic in Walderslade: local notes
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Starkey Castle (about 3.3 miles north-west) nearby, there’s older building stock in the area around Walderslade as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
Homes close to St William's Church include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame. Rented homes near Chatham station change hands often, and cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. Managing a site like Tunbury Primary School? Then its window and door frames need their mastic kept sound, just like a home’s.
Walderslade is about 1 mile south of Chatham, in Medway. If you need window mastic in Walderslade, it’s easy to get a quote: please call 0345 464 0079 or email us. We’re based in Crawley and cover Medway. Walderslade is one of 68 towns and villages in Medway where we work. There’s also a page for Chelmsford, roughly 28 miles from Walderslade.
We work across ME5 for window mastic and the streets around it. That includes homes and businesses on Farm Road, York Avenue and Walsham Road and the roads around them. Being close to the A2045, Walderslade is simple for us to get to for window mastic. Neighbouring places we cover for window mastic include Blue Bell Hill (1 mile west), Lordswood (1 mile east), Kit's Coty (1 mile south-west), Chatham (1 mile north) and Lidsing (2 miles east). Further out, we also cover Gillingham (3 miles north-east), Rochester (4 miles north), Rainham (4 miles north-east), Strood (4 miles north-west), Park Wood (3 miles east) and Twydall (4 miles north-east).
Local landmarks in Walderslade
We work in homes and buildings around Westfield Wood, Greenacre Academy and Walderslade Girls' School and the streets around them. For rail, the closest station is Chatham station, roughly 3.1 miles north of the centre. Nearby you’ll also find Allington Castle (3 miles south) and Pentagon Shopping Centre (3.3 miles north). Not far away are Blue Bell Hill and Burham Down.
How the visit works
When we arrive, we look over the joints with you first. We protect the surfaces around the joints before we start. The work normally takes a few hours for a handful of frames, longer for a whole house. Parking around Walderslade is generally easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- We start by checking each window and door with you.
- We remove the old mastic and clean the frame and the wall.
- Where gaps are deep, backing rod goes in first.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Finally we tidy up and check each joint.
Before we arrive
- Mention any parking rules near the property
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about stairs, lifts or work at height
Get a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. Whenever you are ready, ring 0345 464 0079 or email us.
Related advice
What we can’t put right
Some problems need a builder, plumber or other trade rather than us:
- Broken hinges, locks or handles
- Worn gaskets, brush seals or a door that has dropped
- Damp problems in the wall away from the window
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly before you book.
What we seal
- Patio & French doors
- Aluminium frames
- Composite doors
- Window sills
- Timber windows & doors
- uPVC windows