Isle of Wight · England
Forest Side Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for householders, landlords and businesses in Forest Side. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Tired mastic found when preparing windows for paint
- Mastic dropping out of the joint
- Silicone on a period window that looks wrong
How we handle sand mastic in Forest Side
We renew sand mastic around sash windows and doors set in stone or brick. The old mastic is raked out, the joint is prepared and new mastic is shaped by hand. Common call-outs are for window mastic to renew ahead of painting and gaps round a timber door in stone or brick, on tenement windows, brick reveals and sash and case windows.
In a village or hamlet like Forest Side, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these do not always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
All of our work is guaranteed for twelve months.
- Location
- Forest Side (PO30)
- Wider area
- Isle of Wight
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Landlords, agents and businesses in Forest Side
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
We also work for property managers and facilities teams. We can quote a run of properties together, and we’re fully insured.
Also near Forest Side
What else we do in Forest Side
What we cannot put right
Sealant isn’t the answer to every problem, and we’d rather say so up front. Sealant won’t put right:
- Damaged stone surrounds
- Sashes that need overhauling
- Broken panes
If in doubt, phone 0345 464 0079 or send us an email and we’ll say what we think before you book.
Surfaces we seal
- Tenement windows
- Stone surrounds
- Timber door frames
- Period & listed homes
- Brick reveals
- Sash and case windows
How to look after the new joints
Good habits help new joints last longer. Our tips:
- Keep modern sealant off the mastic
- Keep sills and gutters clear so water drains away
- Renew mastic before redecorating the windows
- Go gently near the mastic when preparing windows
Leave the new mastic unpainted, as traditional guidance advises. If you are redecorating, ask us first.
An open joint round the box lets weather through. Left, the gap tends to get bigger as more mastic falls out.
DIY sealant or a professional job?
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.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Questions from Forest Side
Will you come out to Forest Side?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Is Forest Side in your area for sand mastic?
Yes, Forest Side is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we will send you a clear quote.
I’m a tenant. Can you help?
Yes, but check with your landlord or agent first. Landlords are often happy for the work to be arranged.
Can old silicone round a sash window be swapped for sand mastic?
Usually, yes. With the silicone removed and the joint cleaned we point it with sand mastic.
Is the work guaranteed?
There’s a 12-month guarantee on every job.
Are you an approved applicator?
Yes. We are an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
Should I use sand mastic or silicone?
Sand mastic usually suits period timber windows best. Modern frames normally suit a flexible sealant.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
How it works
At the end, we look at the finished work together and tell you how long to leave it. The work normally takes a few hours for a single window, longer for several, depending on the amount of work. In a small place like Forest Side, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by checking each surround and agreeing the joints to renew.
- We rake out the old mastic and clean the joint.
- We pack any deep gaps so the mastic sits at the right depth.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- We dress the surface so it sits neatly against the masonry.
Before we arrive
- Mention any sign-in or site rules at work premises
- For indoor joints, keep the area dry beforehand if you can
- Let us know about stairs, lifts or work at height
Get a quote
There’s no standard price list, because every job is different. Instead, your job gets its own clear quote. To arrange one, phone 0345 464 0079 or drop us an email.
Advice
Different surfaces, different methods
Stone surrounds
Stone surrounds suit sand mastic well. The finish blends with the masonry.
Tenement and terrace windows
Where a building is shared, window work may involve neighbours so it’s worth checking responsibilities.
What we’re called out for in Forest Side
Shallow joints are a common cause. Mastic that’s too thin cracks and drops out, which is why we pack deep voids first and get the depth right.
If you can see any of these, it’s time to have the joints looked at:
- Weathered mastic on the most exposed windows
- Gaps between timber frames and stone or brick
- Patchy fillers round a sash window
- Tired mastic found when preparing windows for paint
If you look after a building such as Carisbrooke College, the mastic around its windows and doors needs looking after like any other building’s.
Comparing quotes
- How the joint is cleaned and prepared
- How the colour is chosen
- What the cure time is
- Whether all the old sealant comes out first
Windows and doors in Forest Side
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. Historic houses like Carisbrooke Castle (about 1.3 miles south) are a reminder that the area around Forest Side 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.
If you live in an older home near St. Mary's Church, the joint between an old wall and a newer frame is generally the first place rain gets in.
Forest Side is about 1 mile north-west of Newport, in the Isle of Wight. Every kind of property in Forest Side can book us for sand mastic. The work is guaranteed for a year. Forest Side is one of 125 places in the Isle of Wight where we work. You can also see our page for Portsmouth, about 13 miles away.
We work across the PO30 postcode area for sand mastic. Streets in the area include Forest Road and Gunville Road, and we cover them all. If you are just outside Forest Side, we cover Hunny Hill (1 mile east), Parkhurst (1 mile north-east), Noke Common (1 mile north-east), Porchfield (2 miles north-west) and Locksgreen (2 miles west). Within a short drive, we also cover Ryde (7 miles east), Cowes (4 miles north), Sandown (8 miles south-east), Shanklin (8 miles south-east), Ventnor (9 miles south-east) and East Cowes (4 miles north-east). For island and remote addresses, the job takes a little more planning, so mention it when you ask for a quote.
What’s near Forest Side
We work in homes and buildings around Hunnyhill Primary School, Seaclose Park and Island Innovation VI Form Campus, among other places. Nearby you’ll also find Carisbrooke Castle (1.3 miles south) and St Mary's Hospital (1 mile east). Not far away are Mill Hill and Briddlesford Nature Reserve.