Roof Repairs › Cardiff › Lead Flashing Repairs
This page is about lead flashing repairs here specifically — what the fault looks like on these bay-fronted slate terraces, why it happens in this part of South Wales, and what putting it right actually involves.
Call 07868 857692 to arrange an assessment in Cardiff, or message us on WhatsApp.
Flashings on Cardiff Roofs

A flashing is the weathering at every junction where the roof meets something else — a wall, a stack, an abutment — and on a roof sharing its valleys and its stacks there are a great many of them. On these bay-fronted slate terraces these junctions are where most leaks actually start, because the covering itself is usually doing its job perfectly well.
What This Covers
- Split flashing
- Loose leadwork
- Water ingress at junctions
- Water ingress connected with the affected detail
- Localised weathering or damage requiring repair
How Flashings Fail Here
Lead moves with temperature, and a piece cut too long has nowhere to go, so it splits along a fold — which under driven rain off the Channel is exactly where the water then goes. With wind enough to find a slipped slate the splits are found by water immediately, and on a roof sharing its valleys and its stacks the failures are concentrated where previous work used a single long length instead of shorter pieces.
Reaching the Junction

Flashings sit where the roof meets something vertical, which on these bay-fronted slate terraces is frequently the least accessible part of the roof. Where access is tight for scaffold, getting to an abutment safely is often more work than dressing the lead once you are there.
Done Properly Versus Sealed
Mastic and flashing tape over a split are what we are usually called out to replace, because on a roof sharing its valleys and its stacks they hide the defect for a winter and then let go. A correct repair chases the lead into the joint, wedges and points it, and uses lengths short enough to move — which with driven rain off the Channel is the difference between a repair and a postponement.
What Our Lead Flashing Repairs Service Includes in Cardiff
- Split and fatigued flashings replaced in correct lead codes
- Lead chased into the mortar joint, wedged and pointed
- Lengths kept short enough to allow thermal movement
- Step, cover, apron and soaker flashings
- Previous mastic and tape repairs cut out properly
- Abutments, parapets and roof-to-wall junctions




Related Roof Repairs in Cardiff
Lead Flashing Repairs in Cardiff — Common Questions
What are common signs that I may need lead flashing repairs in Cardiff?
A flashing is the weathering at every junction where the roof meets something else — a wall, a stack, an abutment — and on these bay-fronted slate terraces there are a great many of them. With wind enough to find a slipped slate the splits are found by water immediately, and on a roof sharing its valleys and its stacks the failures are concentrated where previous work used a single long length instead of shorter pieces.
Can a small defect cause an internal leak?
Yes. The kind of defect behind lead flashing repairs lets water into the structure on these bay-fronted slate terraces, and it can travel a long way before it shows on a ceiling. That is why the source of a lead flashing repairs problem is traced rather than guessed at from the mark inside.
Will the whole roof need replacing?
Usually not. Lead flashing repairs is repair work, and on a roof sharing its valleys and its stacks the covering around the defect is generally sound — whether a repair is the right answer depends on how far the deterioration has gone beyond the part you can see.
Can you inspect the problem before recommending work?
Yes, always. Given a defect here is often shared with next door, a lead flashing repairs job on these bay-fronted slate terraces is looked at before anything is recommended, and you get told what was actually found rather than a figure guessed from the pavement.
Do you cover other roof repairs in Cardiff?
Yes — lead flashing repairs is one of twenty-five roof repairs we carry out on a roof sharing its valleys and its stacks, and across the surrounding area including Roath, Canton, Cathays, Splott and Llanishen.
Do you cover Cardiff and the surrounding area?
Yes — lead flashing repairs throughout Cardiff and the places around it, including Roath, Canton, Cathays, Splott and Llanishen.
What does a repair like this cost?
Two things set the figure for lead flashing repairs: how far the defect has actually gone, which needs somebody to look at it, and the access. With access here restricted by controlled parking and narrow frontages, that second one moves the price of lead flashing repairs more than the materials do, and it is why a figure over the phone is a guess.
Can you look at other things while you are there?
Yes, and it is worth it — given a defect here is often shared with next door, safe access to the roof is most of what a visit costs, so anything else wanting attention is far cheaper dealt with on the same day as the lead flashing repairs.
Contact T&T Roofing About Lead Flashing Repairs in Cardiff
We carry out lead flashing repairs across Cardiff and the area around it including Roath, Canton, Cathays, Splott and Llanishen. For lead flashing repairs, a photograph of the affected part of the roof and a short description of what it is doing is the quickest start — given a defect here is often shared with next door, those two are what make a figure accurate rather than provisional.
Tell us what the roof is doing in Cardiff and we will look at it. Call 07868 857692, message us on WhatsApp or use the form below.
