Roof valley repairs and replacement

Lead, fibreglass and dry valley repairs where two roof slopes meet and the water is getting through.

In short

A valley is the channel where two roof slopes meet, and it carries far more water than any other part of the roof. When the lead splits, the mortar at the edges fails or debris dams it up, water goes under the tiles rather than down the channel. Valleys are a common source of leaks that get mistaken for something else entirely.

Signs you need valley repairs

  • Damp on a ceiling or wall directly below where two roof slopes meet
  • Visible splits, cracks or holes in the lead of the valley
  • Moss, leaves or debris packed into the channel
  • Mortar crumbling along the tiled edges of the valley
  • Water marks on the rafters below the valley when you look in the loft
  • Tiles along the valley edge slipping or sitting unevenly

What the job involves

Clear and inspect

The channel is cleared out first, because half the time the debris is the problem and the lead underneath turns out to be sound.

Lift the valley tiles

The cut tiles along both edges come up so the full length of the valley can actually be seen rather than just the visible part.

Replace the lining

New lead of the right code, a GRP valley liner or a dry valley system depending on the roof and the run length.

Re-lay the edges

Cut tiles bedded and pointed back along both sides so the channel is clean and the water has a clear run.

Test it

Water down the valley to make sure it runs where it should before we call it done.

Want someone to take a look?

Free quote, no obligation, and a straight answer on whether the work is actually needed.

Valley Repairs near you

We cover Derby, Nottingham, Burton upon Trent and the towns around them.

Frequently asked questions

Why do valleys leak so often?

Because everything drains into them. A valley carries the run off from two whole slopes through one narrow channel, so any split or blockage shows up quickly.

Can a valley just be sealed?

Sealant over a split lead valley is a very short term fix and it usually makes the proper repair harder later. We would rather replace the lining.

What is a dry valley?

A preformed liner, usually GRP or plastic, that replaces lead and mortar. It is quicker to fit, does not attract lead theft and needs no pointing along the edges.

How do I know it is the valley leaking?

Damp appearing below the point where two roof slopes meet is the giveaway. Water can travel along a rafter first though, so it is worth having it looked at properly.

Do valleys need clearing out?

Yes, particularly under trees. Leaves and moss dam the channel and push water sideways under the tiles. It is worth a look each autumn.

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