Ridge tiles fixing method

[seasickstevie]

Had a 'builder' working for me, who I got to fix about 3 ridge tiles on after removing the chimney stack.
I left him with two bags of sand (sharp & soft), a bag of cement and waterproof additive.

After it was finished, I asked him what mix he'd used.

I was a bit surprised when he said instead of the sand and cement, he'd used dry-wall adhesive!
Maybe this is good stuff, but I'm a bit uncertain how it'll last in the rain. Any thoughts on this?

 

[seasickstevie]

This is the 'before' picture. Had a few days of rain, so going to get up there tomorrow to see what the dry-wall adhesive is like.

I didn't ask this on the roofing page, because understandably any roofer worth his salt would dismiss the thought of such a stupid method, but I thought to ask here incase maybe someone's had experience of dry-wall adhesive / dot'n'dab being more resilient than just fixing plasterboard.

 

[seasickstevie]

Surprisingly (if anyone should be interested) the dry-wall adhesive holding the ridge tiles held up to several days' worth of rain rather well... That's the good news.
The aesthetics are another story.

 

[noseall]

90% of the time sand/cement mortar keys pretty well. I'm not sure about slate though. I've seen a lot of mortar delamination with slate, mainly due to the thermal dynamics and the lack of key. I doubted a roofer that used ex-foam (and mortar to point the joints) to repair a couple of ridge tiles, until he asked me to try and pull one free. The S/S bedded ones lifted easily.

 

[^woody^]

I must remember to check the frost rating on a bag of Gyproc next time I'm down the merchants. I my way I'll also see how many houses are gypsum plastered on the outside instead of cement rendered.

This plasteroofer is either a genius or a lazy buffoon. I'd put money on the latter and be able to retire early

The life of a properly mortar bedded ridge tile is in excess of 25 years, not several days in July.

 

[seasickstevie]

Just an update ... not quite as pretty as the original.

Apparently I'm to blame, although not sure why. Be interested on a second opinion

 

[Deluks]

You are to blame, you should've vetted this guy a bit more thoroughly!
Maybe hasn't a clue how to mix up s/s mortar.

Does he also do driveways?