Hertfordshire · England
Thundridge Window Mastic
Window mastic across Thundridge and nearby, with every bit of old sealant taken out first.
- Water coming in at the bottom corners of a door
- Rushed sealant from a window installation
- Gaps where the sill meets the wall
How we handle window mastic in Thundridge
If you can feel air around a shut window, the gap is often at the frame. Resealing that joint can make a room feel noticeably less draughty and quietens the whistle on windy days. Where the air is getting in through the window itself, we will say so. If you have rain getting in at the frame or under the sill and cold air getting in at the frame edge, we can put it right, whatever the surface.
Mastic can only go onto a dry, clean joint, so window work in Thundridge is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
Your job is guaranteed for a year, as with all our work.
- Location
- Thundridge (SG12)
- Wider area
- Hertfordshire
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
How to look after the new joints
Good habits help new joints last longer. A few tips:
- Avoid harsh chemicals near the mastic
- Clear any debris from frame drain holes
- Check the mastic once a year
- Keep timber frames painted
Try not to touch the new joint while it cures, following the cure time we give you. Don’t point a pressure washer at the joints.
On timber windows, water behind the joint can lead to rot. Once wood has rotted, it needs repair before it can be sealed, so it pays to reseal before that happens.
How the job changes by surface
Composite doors
Front doors take the weather head on, and the top and bottom corners tend to fail first. We pay most attention there.
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.
What we do, step by step
At the end, we look at the finished work together. The visit itself usually takes a morning for a couple of windows and a door, depending on the size of the job. Somewhere as small as Thundridge, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
Before we arrive
- Clear the area around the work
- For business premises, tell us about site rules or sign-in
- Plan for the work area to be out of bounds to pets and children
Get a quote
Need a quote? Please phone 0345 464 0079 or send us an email and tell us about the job. We will explain what we’d do and give you a clear price before work begins.
Related advice
When something else is needed
We will always be straight with you, so here’s what sealant can’t fix:
- Damp coming through the wall itself rather than the frame joint
- Rotten timber, which needs a joiner first
- Draughts through the window seals rather than the frame
If you are not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer before booking.
Surfaces we seal
- Timber windows & doors
- Aluminium frames
- uPVC windows
- Window sills
- Composite doors
- Patio & French doors
Frames and glazing around Thundridge
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Much Hadham Palace (about 4.8 miles east) nearby, there’s older building stock in the area around Thundridge as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
If you live in an older home near Parish Church of St Mary, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Rented homes near Ware station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints.
Thundridge is about 1 mile north of Ware, in Hertfordshire. We provide window mastic to homeowners, landlords and businesses in Thundridge and the surrounding area. Our area takes in 381 places across Hertfordshire. London is on our list too, around 23 miles away.
We work across SG12 for window mastic and the streets around it. That includes homes and businesses on Woodlands Road, Cold Christmas Lane and Ducketts Wood and the roads around them. Nearby, we also carry out window mastic in Wadesmill (1 mile north), Cold Christmas (1 mile east), High Cross (1 mile north), Ware (1 mile south) and Tonwell (2 miles west). Within a short drive, we also cover Stevenage (8 miles north-west), St Albans (14 miles south-west), Bishop's Stortford (8 miles east), Welwyn Garden City (7 miles west), Harpenden (14 miles west) and Hitchin (13 miles north-west).
Near you in Thundridge
Around Thundridge, our work takes us to homes and buildings near Sow & Pigs pub and The Chauncy School, among other places. Thundridge’s nearest station is Ware station, about 1.8 miles south of the centre. Well-known places in the area include Hertford County Hospital (3.6 miles south-west) and Barrowfield (2.5 miles south). Not far away are King's Meads.
Thundridge: your questions answered
Is Thundridge within the area you cover?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Can you do window mastic in Thundridge?
Yes. We work across London and the South East, and Thundridge is part of that. You can ring 0345 464 0079 or send us an email and tell us what needs doing.
How do I get a quote for window mastic in Thundridge?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Can new sealant go over the old?
No. We remove every bit of old sealant first.
Do you seal inside as well as outside?
Yes. Draughts often come through the inside gap too, so it can be worth sealing both.
Can you reach windows above the ground floor?
Yes, in most cases. We plan safe access before the job, so mention the height and anything in the way.
Do you have insurance?
Yes. We are fully insured.
Do you work for hotels and businesses?
Yes. Hotels, offices and other businesses use us, and we are fully insured.
Also near Thundridge
More services for Thundridge
Can I do it myself?
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.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Signs you need window mastic in Thundridge
On timber frames, paint and putty build up around the joint. Mastic painted over many times cracks with the paint, and the wood moves with damp as well as heat.
If you can see any of these, it’s time to have the joints looked at:
- A bead that doesn’t match the frame
- Black, perished sealant on frames
- Gaps between the frame and the inside reveal
- Rain getting in at the frame or under the sill
Managing a site like Thundridge Church of England Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
Before you book anyone
- Whether they seal over old material or remove it
- Who turns up on the day
- What guarantee comes with the work
- Whether they’re fully insured
Leave it or put it right?
Choosing the product is half the job. Decorators’ caulk and bathroom silicone aren’t designed for outside joints that move. An exterior, low-modulus sealant stays flexible in sun and frost. Older cottages and farmhouses around Thundridge can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, plus any working-time requirements on site. Ask us for a quote and we will go through it with you.
Why choose Mr Mastic in Thundridge
- We never seal over old sealant
- Neat joints and a tidy finish
- Trusted Arbo and Everbuild sealants
- Every job guaranteed for a year
Take a look at our cost guide and what customers say.