Reading · England
Caversham Window Mastic
Mastic around window and door frames, sills and patio doors for homes and businesses in Caversham and across Reading. Fully insured, ARBOMaster approved and guaranteed for a year.
- Cracked or shrunken mastic around the frame
- Gaps where the sill meets the wall
- Draughts coming in around windows and doors
About our window mastic in Caversham
From a single sill to a whole house of windows, the work is priced before anything is done. To get one, call 0345 464 0079 or drop us an email with the number of frames and any access details. If you are dealing with rushed sealant from a window installation and a bead that doesn’t match the frame, we can put it right, whatever the surface.
Caversham mixes older streets, where windows have often been replaced, with newer estates fitted with uPVC. In every case, the joint between frame and wall is what keeps water out.
All of our work is guaranteed for twelve months, in Caversham and everywhere else we cover.
- Place
- Caversham (RG4)
- Region
- Reading
- Cover
- One year on every job
- Quotes
- A clear price before work begins
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What sealant work cannot fix
Some problems need a builder, plumber or other trade rather than us:
- A sash or casement that will not close properly
- Condensation trapped between the panes
- A frame that has rotted at the joint
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly before you book.
Joints and surfaces we work on
- Patio & French doors
- Window sills
- uPVC windows
- Composite doors
- Timber windows & doors
- Aluminium frames
Towns and villages near Caversham
What else we do in Caversham
What happens on the day
All our tools and materials come with us in the van, so there’s nothing for you to buy. Once we have agreed what’s being done, the area is protected and the work begins. Most jobs take a few hours for a few frames, or a day or more for a whole house. For a job in Caversham, we need access to where the work is and somewhere nearby to park. For outside work, let us know about side access, gates and any upper-floor joints.
- We check each frame and agree which ones need doing.
- Next the failed sealant is cut away and the joint cleaned.
- We fit backing rod in deep gaps so the sealant is the right depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Every joint is checked before we leave.
Getting ready for the visit
- Mention any tricky access
- Keep pets and children clear of the area while we work
- Let us know if you’ve seen damp or leaks
Getting a quote
There’s no standard price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To arrange one, phone 0345 464 0079 or email us.
Read more
Surface by surface
Window sills
The end joints of a sill tend to fail before the rest. A tight seal at each end keeps rain out of the wall.
Patio & French doors
Patio and French doors have the longest joints on most houses. Most leaks start at the bottom corners, so they get particular care.
Keeping the joints in good condition
So the new joints stay in good condition:
- Use gentle cleaners on frames and sealant
- Don’t aim a pressure washer at the joints
- Wipe condensation off the frames
- Avoid harsh chemicals near the mastic
Most silicone sealants will not take paint, so if you are planning to paint the frames or walls, tell us beforehand. There are paintable sealants for joints that need it.
Wet, windy weather is when failed mastic shows itself, but resealing works best in dry conditions. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
Frames and glazing around Caversham
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Mapledurham House (about 3 miles west) are a reminder that the area around Caversham has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
For site and facilities teams at buildings such as The Hill Primary School, larger buildings have plenty of frames, and the mastic around each one ages. For landlords with property near Reading station, renewing tired window mastic between tenants heads off draught and damp complaints.
Caversham is about 2 miles north of Reading, in Reading. Jobs in Caversham get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Caversham is one of 34 places in Reading we cover.
All of RG4 is covered for window mastic. Window mastic is available to properties on Marshland Square, Church Road and Buckingham Gate and the roads around them. Caversham sits on or near the B3345, which makes travel easy. Nearby, we also carry out window mastic in Emmer Green (1 mile north-east), Caversham Park Village (1 mile north-east), Lower Caversham (1 mile south), Caversham Heights (1 mile west) and Littlestead Green (1 mile north-east). Further out, we also cover Norcot (3 miles south-west), Tilehurst Within (3 miles south-west), Shinfield (5 miles south), Arborfield Garrison (7 miles south-east), Horncastle (3 miles south-west) and Whitley Wood (4 miles south). Caversham is one of the larger places we cover in Reading.
Around Caversham
Locally, jobs take us to homes and businesses close to Chiltern Nursery Nurse Training School, The White Horse pub and Eldon Square, among other places. Caversham’s nearest station is Reading station, about 1.3 miles south. Other landmarks nearby include Royal Berkshire Hospital (1.9 miles south) and Broad Street Mall (1.6 miles south). Not far away are South Lake and Sonning Hill.
Why deal with it now?
Working on frames from a ladder with a sealant gun isn’t easy, especially upstairs. A professional job is cut out properly, backed where needed and finished neatly, using a product chosen for the frame and wall. Draughts from a gap round a frame, damp under a sill or water behind a bath panel all start small, and they’re far easier to fix early.
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Why us?
- Colour agreed with you before work begins
- Trusted Arbo and Everbuild sealants
- Every job guaranteed for a year
- Sanitary silicone with an anti-fungal additive in wet areas
Work for landlords, hotels and businesses
We also work for property managers and facilities teams. Several sites can be quoted together, and we’re fully insured for the work.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can go on one quote.
When to call us in Caversham
A lot of older mastic was never designed to stay flexible. Once it’s rigid, every bit of frame movement pulls at it, and a gap opens along one edge.
If you can see any of these, it’s time to have the joints looked at:
- Damp patches on the reveal after heavy rain
- Draughts coming in around windows and doors
- Sealant in the wrong colour for the frame
- Gaps where the sill meets the wall
If you live in an older home near Grace Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Before you book anyone
- Whether VAT is included
- What preparation is included
- How long the guarantee is
- How much experience the applicator has
FAQs for Caversham
Do you cover Caversham for window mastic?
Yes. We work across London and the South East, and Caversham is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job.
I let a flat near Reading station. Can you help?
Yes. We work for landlords and letting agents as well as homeowners, and several properties can be quoted together. Just call 0345 464 0079 or email us with the address and what needs doing, and we will send you a clear quote.
Is it worth trying it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Is it messy?
No. We work neatly, protect the area around the joints and tidy up afterwards.
Can you seal over the old sealant?
No. Fresh sealant doesn’t stick to old sealant, and it traps any mould or water underneath. It all has to come out first.
Can you seal the gap between the frame and the plaster indoors?
Yes. Draughts often come through the inside gap too, so it can be worth sealing both.
Are you insured?
Yes. We’re fully insured.
How much does window mastic cost in Caversham?
Size, access and the old material all affect the cost. Ask us for a quote and we’ll talk you through it.