Cost/Price to Repair or Replace a Roof Valley

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A roof valley is where two sloping roofs meet and rainwater is channelled downwards, usually into a gutter, but sometimes onto a lower section of roof. It should not be confused with a gully which is horizontal.

Roof valleys are prone to leaking, especially during heavy rain. How you repair this part of the roof will depend on what the valley is made from. Roof valleys can be constructed from the following materials:

  • Lead
  • Concrete tiles
  • Fibreglass

Cost to Repair/Replace Roof Valley

Example cost 1 – Scaffold to gutter height, replace the cement only, leaving existing the valley in place

LocationSmall Business /TraderLarge Business
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London Area£450.00£600.00
South, SW and Midlands£350.00£450.00
Outer Region and North£350.00£400.00

Example cost 2 – Full valley replacement, scaffold to gutter height, new underfelt, GRP valley and cement work

LocationSmall Business /TraderLarge Business
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London Area£550.00£750.00
South, SW and Midlands£500.00£650.00
Outer Region and North£450.00£550.00

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How to Repair a Roof Valley

There are occasions when a roof valley is in good condition, but the cement has washed out or crumbled. In these circumstances, it may be possible just to leave the existing valley base in place.

Here are two “before” and After” photos of a valley with newly laid cement. The valley base was in excellent condition, so didn’t need replacing or repairing at all.

Old roof valley - before

Before

Roof valley - after

After

Full Replacement

If you have concrete tiles as a base for the roof valley then they will need to be replaced, it is almost impossible to repair these and they are prone to leaking.

A full valley replacement involves removing all the tiles in the valley, all the cement and also the underfelt. If the valley has been leaking for a while then this felt is usually rotten anyway.

New timber is first laid to the valley; this is to give the new lead or GRP (Fibreglass) valley support. New felt is then laid on top of this. The valley itself is then laid into place. Both GRP and lead valleys are simply overlapped, although lead should not be used in lengths greater than 1500mm without an overlap (it will buckle/split due to thermal expansion/contraction)

The tiles either side of the roof valley are then bedded onto a 3-1 sand/cement mixture and pointed to leave a neat finish.

How Long Does it Take to Repair or Replace a Roof Valley?

It will take two men half a day to replace only the cement (see two photos above) but if you need the entire valley replaced then it will take around a day for a typical 3 or 4-metre valley. The time it takes varies and ultimately depends on several factors such as access requirements and the type of tiles on the roof.





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2 Responses to “Cost/Price to Repair or Replace a Roof Valley”

  1. neilMarch 15, 2016 at 11:06 am #

    maybe you should allow someone with some knowledge actually handle your sites information

  2. Pamela BullAugust 2, 2016 at 5:59 pm #

    I would like to no how much it cost to repair two val lies

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