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Had a roofer replace some missing ridge tiles on the hip of my roof. He has used mismatching ones. Disregarding aesthetic, is this a problem?

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  • Finding replacement tiles that match is just about impossible , even if you can find the same pattern they will be a different color, I would have started at the top of the ridge but there is not as much moisture on the ridge as the lower tiles
    – Ed Beal
    Apr 14, 2022 at 13:40

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Clay ridge tiles don't really waterproof anything. The mortar joints are common leak points. The tar paper or synthetic membrane underneath does that. The tiles are for protection and appearance.

So, as you suspected, this is just an appearance issue. Tile size aside, I've certainly seen prettier mortar work.

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Should not be a problem, if they seal well to the old ones.

The only function they have is to keep the weather out, looking good is only a bonus.

Will need to check that the top most one is well sealed to the old, that is the first place water can enter, since water flows downward easy.

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    I was thinking about the top-most one, too. Needs to have a nicely shaped mortar "bead" leading up to it to encourage the water to flow away and not collect up there where it can spend time working its way through the mortar.
    – FreeMan
    Apr 14, 2022 at 13:40
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I'd tend to disagree with the other two answers - that appears to be an appallingly bad standard of work. Even a competent DIYer would do a better job than that, let alone someone who claims to be an experienced roofer. I'd be concerned that they're not sufficiently bedded to keep them in place in the long term and that the poor finish will allow water in, which will hasten deterioration by freeze-thaw - particularly where the top tile is raised above the existing. Also, it's not that difficult to find reasonable (not perfect) matches for even very old roof tiles (yours are not ancient - and they're 'modern' concrete, not clay) - again a competent roofer would have little trouble sourcing a much better matching tile. Having said that they'll probably stay up for a few years or more so unless you're planning on staying in the house for a long time you could always just let the next owner worry about it!

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