Acceptable gap between Marley roman roof tiles

[Skipsteer]

We just had our roof completely renewed from the boarding outwards, including re-tiling with marley roman roof tiles.

I noticed, especially in the valleys, some big gaps between tiles not resting on the grove of the adjacent tile. You'll see on the photos a couple of these tiles where I can put my full finger between the gaps.

I'd be worried a gust of wind could easily blow these off and possibly, to a lesser extent(?) , it might allow water in.

There were quite a few of these and some not in the valleys, although the gaps on these wasn't as big. Still up to approx 10mm though in areas away from valleys.

One of them (in the picture) had some white stuff coming out as well.

Is this something I should be worried about and what is an acceptable gap between tiles in this way?

I'm waiting to hear back from the roofer and want to be prepared in case he says there's no issue.

Would it be acceptable to withhold say £500 until these snaggings are fixed?

Thanks in advance for any help and advice with this.

 

[noseall]

Would it be acceptable to withhold say £500 until these snaggings are fixed?

Why pay anything until the snags are fixed?

There seems to be an absence of mortar in that valley..?

He hasn't dressed/bossed the lead down into the troughs on that lead slate either.

 

[Skipsteer]

Why pay anything until the snags are fixed?

There seems to be an absence of mortar in that valley..?

He hasn't dressed/bossed the lead down into the troughs on that lead slate either.

Do valleys always need mortar?
Just looking online and suggests this is not always necessary?

What would be the potential concern with the lead slate (assuming the one with the vent) not being dressed/bossed down?

Is there any real risk with this being susceptible to wind or water damage?

Thanks for your comments, as this is all new to me, so good to get some expert advice.

 

[noseall]

Do valleys always need mortar?
Just looking online and suggests this is not always necessary?

Yes wet valleys like yours do need mortar.

The consequences are water (snow), bird and insect ingress (same for the lead slate).

 

[Skipsteer]

They fitted bird prevention combs in the valleys and there is a bit of overhang with the tiles. Also looking under the tiles the valley does curve up a good couple of inches on both sides creating a fairly noticeable valley for water to flow.

The valley side on the left (in previous photo) is where the house was extended 15 years ago, which hasn't been re-tiled and I believe that didn't have mortar either. Although the side on the right, which is the original roof that was re-roofed may have had mortar.

We've never had issues with insects in the roof before.

Based on this, realistically is it likely to be just the snow that could cause some issues with water ingress?

Presumably this should be a minor issue though as it doesn't snow that often and any water ingress from the snow should have plenty of time to dry out?

I've since paid the roofer as they were quick to fix the valley tiles by using valley clips. See new photos at both sides of valley.

Thanks again for your thoughts on this, as want to make sure I know about any potential issues in advance.

 

[datarebal]

Birds need homes top I guess

 

[Skipsteer]

Birds need homes top I guess

You don't think bird prevention combs fitted the length of either side of the valleys (out of sight under the tiles) are sufficient bird deterents?

I can't see how they would get in there.

Are you meaning specifically from the lead slate for the vent not being bossed down enough?

 

[datarebal]

How are they fixed under the valley cuts ?

 

[Skipsteer]

They must be nailed or glued into the top of the lead valley I think by looking at this photo I took under the tile overhang.

I'm guessing nailed down.

If so would this work OK?