Many terraces in Tonypandy were roofed with Welsh slate in the late 1800s, and good slate is a hard-wearing material. The slate itself is often not what has failed. The nails, battens and flashings underneath tend to go first. So the honest answer to whether yours can be saved depends on what lies beneath it, and on the condition of each slate.
Why the slate often outlives its fixings
Old slates were held on with iron nails, and those rust through over a long time. The slate stays whole while the nail gives way, so slates slip out of position even though they look solid from the street. If the slipping is spread across the slope rather than in one place, the fixings are usually the problem. Re-fixing individual slates then becomes a repeat job rather than a lasting repair.
How we test each slate
Once the roof is stripped, we sort slates by hand. A sound slate gives a clear ring when tapped and has no flaking, cracks or soft, layered edges. Dull sounds, splitting along the grain and a powdery surface all mark a slate that is near the end. Nail holes matter too. A slate with a worn or enlarged hole can no longer be fixed securely, so it is set aside even if the rest of it looks good.
- Clear ring when tapped means the slate is still sound
- Flaking or layered edges mean the slate is failing
- Cracks across the nail holes rule it out for reuse
- Heavy staining alone does not mean the slate is poor
Reclaiming and reusing on the same house
Where a good proportion of the slate passes, we can reuse it on the visible front slope, where the original look matters most. It is cleaned, graded by size and relaid on new battens and membrane with fresh fixings. Reused slate is graded, so you may need some matching replacement slate to fill the gaps. We talk through what that looks like on your roof before the work begins, so there are no surprises.
When it makes sense to replace
If most of the slate is delaminating, or the roof has been patched repeatedly with mixed material, reuse stops being sensible. Putting weak slate on a new structure only brings the problem back. Then the choice is new natural slate, or a fibre cement slate that gives a similar appearance on a terrace. We show you samples against the neighbouring roofs so the row still looks right, and we advise whether any planning or Building Regulations checks apply before work starts.
What to do now
Start with the loft. Look for daylight, damp timber and slate fragments in the roof space or the gutters, and note any slipped slates you can see from the street. Do not climb up to look closer. Then call us for a proper survey. We will tell you straight whether your slate can be kept, partly reused or replaced, and why.
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