Reading · England
Southcote Window Mastic
Mastic around window and door frames, sills and patio doors for Southcote, backed by a one-year guarantee. Call for a quick quote.
- Gaps where the sill meets the wall
- Draughts coming in around windows and doors
- Damp patches on the reveal after heavy rain
How the job changes by surface
Composite doors
A composite door usually sits in a plastic outer frame, and the joint around it is sealed like a window. The bead is colour-matched to the frame.
uPVC windows
uPVC expands and contracts noticeably with temperature, so we use a flexible, low-modulus sealant. We match white, brown, anthracite grey and black frames.
About our window mastic in Southcote
Over two decades of sealing frames has taught us which products suit which walls. We’re ARBOMaster approved and fully insured, and we give a 12-month guarantee on the work. If you are dealing with cracked internal joints between frame and plaster and sealant in the wrong colour for the frame, we can put it right.
In a smaller place like Southcote, some walls face open ground and catch the full force of the weather. The mastic around frames on those walls tends to age faster.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Place
- Southcote (RG30, RG31, RG1)
- Region
- Reading
- Guarantee
- One year on every job
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Places near Southcote
More services for Southcote
When it isn’t the sealant
To be straight with you, some problems need a different trade:
- Faulty window hardware
- A door that needs adjusting, rehanging or new seals
- A frame that has rotted at the joint
If you are not sure, just phone 0345 464 0079 or drop us an email and we’ll give you a straight answer before you book.
What we seal
- Patio & French doors
- Aluminium frames
- Composite doors
- Timber windows & doors
- uPVC windows
- Window sills
Should I try it myself first?
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
Do you need window mastic in Southcote?
On timber frames, paint and putty build up around the joint. Mastic painted over many times cracks with the paint, and timber moves with moisture as well as temperature.
The problems people usually mention when they call include:
- Gaps between the frame and the inside reveal
- Damp patches on the reveal after heavy rain
- Rushed sealant from a window installation
- Cracked sealant at the sill ends
For site and facilities teams at buildings such as Manor Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
What to look for in a quote
- What the cure time is
- What happens if they find a problem under the old sealant
- Who turns up on the day
- Is the old sealant removed completely?
Landlord and commercial work in Southcote
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we’ll give you a quote.
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.
FAQs for Southcote
Do you work for landlords with property near Reading Green Park station?
Yes, we work for landlords and agents. Just phone 0345 464 0079 or email us and tell us about the property, and we will send you a clear quote.
Is Southcote in your area for window mastic?
Yes. Our work covers London and the South East, and Southcote is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear quote.
Does someone need to be in?
That depends on where the joints are. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
What should I tell you?
Let us know what needs doing and where. If we need more, we will ask.
Are you ARBOMaster approved?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
Is it OK to seal over 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.
How long before the joint can be used?
It depends on the product and the conditions. We tell you how long to leave it before we go.
Is the new sealant paintable?
Not if it’s silicone. Tell us your decorating plans and we will pick a sealant to suit.
What happens if it’s left?
Once mastic fails, rain can get between the frame and the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. Resealing now is a small job by comparison. Around Southcote, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
What you pay reflects the work, not guesswork. That’s why we ask a few questions first.
Why Southcote clients choose us
- Quality sealants from Arbo and Everbuild
- We never seal over old sealant
- White, clear, grey or coloured to suit, where the product allows
- Over 20 years’ experience
Read what affects the cost and what customers say.
Frames and glazing around Southcote
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Mapledurham House (about 3.1 miles north) nearby, there’s older building stock in the area around Southcote as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
Letting a property close to Reading Green Park station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. In the older streets around St Matthew's, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Southcote is about 2 miles west of Reading, in Reading. Southcote gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. We cover 34 towns and villages across Reading, from the larger towns to small villages.
All of RG30, RG31 and RG1 is within our area for window mastic, from the main roads to the quietest streets. You will find streets such as Bath Road, Dwyer Road and Brunel Road, and we cover them all. We also cover the places around Southcote: Fords Farm (1 mile west), Horncastle (1 mile west), Burghfield Bridge (1 mile south-west), Tilehurst Within (1 mile north-west) and Norcot (1 mile north-west). Further out, we also cover Caversham (3 miles north-east), Shinfield (4 miles south-east), Arborfield Garrison (6 miles south-east), Caversham Heights (3 miles north), Whitley Wood (3 miles south-east) and Sonning Common (5 miles north).
Near you in Southcote
Typical jobs here are in homes near The Happy Prospect pub, Elvian School and Calcot Park and the streets around them. The closest station to Southcote is Reading Green Park station, roughly 1.1 miles south of the centre. Other landmarks nearby include Beaumys Castle (4.7 miles south) and Battle Hospital (1.3 miles north-east). The countryside around Southcote includes Sonning Hill and South Lake.
What happens on the day
Once we are on site, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. After that, the work takes most of a day for a typical house, less for a few frames. For a job in Southcote, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely.
- The surfaces are cleaned and left dry, and primed where the sealant calls for it.
- Deep voids are backed, then the sealant is gunned in.
- We tool the joint so water runs off, then clear up.
Getting ready for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Tell us if parking is tricky
- Move anything stored near the joints
Getting a quote
If you’re in Southcote and need window mastic, call 0345 464 0079 or email us. Tell us what the problem is and where, and you’ll get a clear quote before any work starts.