DIY Doctor

Main navigation


Black Gravel in Clay Ridge Tiles

Postby Partly Cloudy » Fri Dec 17, 2021 8:50 pm

I thought I'd replace some damaged clay angled ridge tiles on the roof of my house built in 1936.
There is a black crumbly filling, like gravel under all the ridge tiles. I've added some photos. This gravel is damp because the mortar had mostly dropped out over the years and the tiles had holes in them.
The roof doesn't look like it has been touched since the house was built.
What is this gravel and what purpose was it meant to serve?
Thanks!
Attachments
IMG_4251.jpg
IMG_4250.jpg
Partly Cloudy
Rank: Labourer
Progress to next rank:
25%
Posts: 2
Joined: Fri Dec 17, 2021 8:32 pm


Postby stoneyboy » Sun Dec 19, 2021 12:09 am

Hi partlycloudy,
It is there to stick the ridge tiles in place so they do not blow off in high winds.
Regards S
stoneyboy
Rank: Project Manager
Posts: 5074
Joined: Wed Dec 10, 2008 6:44 pm


Postby Partly Cloudy » Thu Dec 23, 2021 11:45 am

Thanks for the info Stoneyboy. It's obviously degraded from being mortar to soft gravel over the years. It didn't have any adhesive quality left at all, so I brushed it out where I replaced ridge tiles and will rely on the mortar I used to bed in the new ridge tiles and their own weight. The original Acme Sandstorm roof tiles on one side of the roof are so frost-damaged now, that I'll have to have the whole roof retiled this summer, so my ridge tile replacements are only temporary.
Partly Cloudy
Rank: Labourer
Progress to next rank:
25%
Posts: 2
Joined: Fri Dec 17, 2021 8:32 pm


Postby stoneyboy » Thu Dec 23, 2021 10:57 pm

Hi partlycloudy,
Thanks for responding.
Use a weak mortar mix so the ridges can be easily removed for the re-roof.
You will never know the conditions when the ridges were laid but if it was a hot sunny day it’s fairly certain that the mortar will have dried out and not set properly.
Regards S
stoneyboy
Rank: Project Manager
Posts: 5074
Joined: Wed Dec 10, 2008 6:44 pm



Display posts from previous
Sort by
Order by



  • DIY How to Project Guides
  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!


 
  • Related Topics