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Alex Shepherd Roofing
Roofing service

Repointing and pointing

Pointing is the mortar between things, and on a roof it is doing more work than people realise. It holds ridge tiles down, seals the verge at the gable end, and keeps water out of the joints in stonework and chimneys.

It also has a much shorter life than the roof around it, which is why a hundred-year-old roof might be on its third lot of pointing.

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East Lancashire & Craven
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What we repoint

  • Ridge and hip tiles, the most common job on this page
  • Verges, the mortar along the gable edge of the roof
  • Chimney stacks, where the joints have washed out
  • Stonework and brickwork, particularly on exposed gables and chimneys
  • Flaunching, the mortar bed around the chimney pots

How to tell it has gone

From the ground you can see more than you might think:

  • Gaps or missing sections along the ridge line
  • Ridge tiles that look out of line or have shifted
  • Mortar lying in the gutter or on the ground after wind
  • Crumbling mortar at the gable edge
  • Open joints on the chimney stack, or pots looking loose
  • Vegetation growing out of a joint, which means it has been holding water for years

Failed ridge pointing is worth acting on quickly. A ridge tile is heavy and it lands somewhere.

Getting the mortar right

This is the part that gets skipped, and it matters most on the stone property round here.

Old solid stone walls need lime mortar, not cement. A solid wall handles water by absorbing it and letting it evaporate back out, and lime allows that. Cement does not. Point an old stone wall or chimney in hard cement and the water that gets in has to leave somewhere else, usually through the face of the stone, which then spalls and crumbles.

The damage is slow, expensive and permanent. Plenty of stone gables locally have been quietly ruined this way by well-meant repointing.

On a modern cavity wall, or for bedding ridge tiles, cement-based mortar is correct.

Should you use a dry ridge system instead?

For ridges and hips there is now an alternative to mortar: a dry ridge system, mechanically fixed with screws and a sealing strip.

It costs more up front. It does not crack, does not wash out, and does not need doing again in fifteen years. On an exposed roof, and most roofs round here are exposed, it is usually the better value over time. We will price both if you want to compare.

What repointing costs

  • Length of ridge or area of stonework
  • Access and scaffold, which is most of the cost on a chimney
  • Whether old mortar has to be raked out by hand, which lime work requires
  • Lime mortar costing more in labour than cement, and being slower to cure
Common questions

The things people ask us

Ridge bedding in cement typically goes fifteen to twenty years on an exposed roof. Lime pointing on stonework, properly done, lasts considerably longer.

Ridge work on a low roof sometimes. Chimney work realistically needs a scaffold or a tower, and anyone proposing to do a stack off a ladder is taking a risk with their own safety and the quality of the work.

That is the flaunching, the mortar bed the pots sit in, and yes it is related work. Loose pots need dealing with promptly.

Reviews

What people said about the work

Read the reviews, then ring us and see if we match up.

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