Ridge tiles fixing method

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seasickstevie

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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?
 
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.
 

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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.
 
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.
 
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.
 
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
 

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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?
 
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