Hampshire · England
External & façade joints in Forestside, Hampshire
Professional external mastic in and around Forestside, with every bit of old sealant taken out first.
- Damp patches traced to an open external joint
- Weeds or debris growing in open joints
- Panel joints letting water in
How we handle external mastic in Forestside
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. The colour is chosen to suit the brick or render so the joint doesn’t stand out. If you’re dealing with hard, crazed mastic that has stopped moving and failed seals between different materials, we can help, whatever the surface.
Older homes in small places like Forestside may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water generally gets in.
We stand behind the work with a 12-month guarantee.
- Where
- Forestside (PO9)
- Region
- Hampshire
- Guarantee
- One year on every job
- Quote
- A clear price before we start
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
When to call us in Forestside
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, so it pulls away from the edges.
The most common problems we see are:
- Water getting into walls through failed joints
- Joints pointed up with cement by mistake
- Old sealant gone brittle and cracked
- Joints where the bead has come unstuck
In the older streets around Christ Church, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Questions to ask before you book
- How hidden problems are handled
- How the joint is cleaned and prepared
- Who does the work, and how experienced they are
- What the cure time is
Forestside questions
Can you help a landlord with a rental near Rowlands Castle station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before we start.
Is Forestside within the area you cover?
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.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we’ll tell you what we are using.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Is it OK to seal over old sealant?
No, it won’t last. It can look neat for a few weeks, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. Once we’ve agreed the job, you do not need to watch us work.
What should I tell you?
Only a few details: where it is, what you’ve noticed and how we reach it. After that, simply ring 0345 464 0079 or send us an email.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. Our applicators cover Forestside, along with the rest of our area.
Outside joints around Forestside
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Uppark (about 3.2 miles north) nearby, there’s older building stock in the area around Forestside as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
If you let a flat or house near Rowlands Castle station, outside joints that have cracked can let damp into a rental, so check them between lets.
Forestside is about 4 miles east of Horndean, in Hampshire. From the centre of Forestside to the outskirts, external mastic is available for homes and businesses alike. Forestside is one of 683 places in Hampshire we cover. Our Portsmouth page covers work nearby, about 10 miles away.
Every address in PO9 is covered for external mastic, from the main roads to the quietest streets. Whether your property is on Lodge Lane and Forestside or anywhere close by, our applicators can take on the job. Other places close to Forestside include West Marden (1 mile north-east), Chalton (3 miles north-west), Blendworth (3 miles west), Buriton (5 miles north) and Nursted (5 miles north). We also work in nearby towns such as Gosport (13 miles south-west), Havant (5 miles south-west), Fareham (13 miles west), Horndean (4 miles west), Waterlooville (6 miles west) and Petersfield (7 miles north).
Near you in Forestside
Typical jobs here are in homes near Stansted Park, among other places. The closest station to Forestside is Rowlands Castle station, about 2.2 miles south-west of the centre. Other landmarks nearby include Clanfield Earthwork (4 miles north-west) and Havant War Memorial Hospital (5 miles south-west). Open spaces near Forestside include Compton Down and Kingley Vale National Nature Reserve.
Can I do it myself?
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so just mention it when you contact us.
If you are 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 does not work out, we can still put it right.
Different surfaces, different methods
Copings and trims
Coping joints that leak let water straight down into the wall. Resealing them is a small job that protects a lot.
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. The movement joint takes that up, so the sealant in it must stay soft and stretchy.
The process
Before we leave, we go over the finished joints with you. The work normally takes a few hours to a few days, depending on the length of joint and the access, depending on the size of the job. Somewhere as small as Forestside, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- For indoor joints, keep the area dry beforehand if you can
- Move anything stored near the joints
- Let us know about stairs, lifts or work at height
Get a quote
If you are in Forestside and need external mastic, phone 0345 464 0079 or drop us an email. Tell us what the problem is and where, and you’ll get a clear quote before work begins.
Advice
Landlords, agents and businesses in Forestside
For anyone letting property in or around Forestside, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs, and pictures by email help.
Letting agents and landlords in Forestside can book us as well as householders. Resealing between tenancies keeps a property looking cared for.
Also near Forestside
Also in Forestside
Why it’s worth doing now in Forestside
The longer a joint stays open, the more water the wall takes in. In cold weather, frost can damage wet brick and render around the joint, so the problem grows beyond the joint itself. Older cottages and farmhouses around Forestside can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Combining jobs into one visit is normally more efficient than separate visits. We’ll give you a clear quote for the lot.
Why choose Mr Mastic in Forestside
- An ARBOMaster approved applicator
- We leave the area clean and tidy
- Trusted Arbo and Everbuild sealants
- Experience in homes, commercial sites and hotels
Take a look at what affects the cost or customer reviews.
How we quote for external mastic
There’s no set price list, because no two jobs are the same. The quote depends on:
- Whether the work is at height
- The number and length of the joints
- The number of rooms or windows
- Working hours on commercial sites
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please call 0345 464 0079 or email us.
What we need to know
Photos help, but a description is a good start. Try to tell us:
- How many joints, rooms or windows are involved
- Where the job is, and your postcode
- Any access issues, like height or stairs
- Photos by email, if that is easy
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email photos if that is easy.