Dot & Dab travertine?

[pjtiler]

The 3 porblems with d&d are.
1. The risk of exceeding the bedding depths. 6/5mm, 10mm in isolated areas. this can result in the adhesive exsesivly shriking. As I said I looked at a failure yesterday of 800x800 tiles on a wall, where the thick bed of d&d adhesive had shrunk, and caused the tiles to debond.

2. You need to make sure you're getting 100% (or there abouts) coverage in wet areas, and 80% elsewhere. This is to be able to support the weight of the tiles.

3. The BS says weight limits of 20kg psqm on plaster, if you have a 12mm stone fixed to 5 or 6 dabs of adhesive, then you are far exceeding your weight limits.

If you can d&d, and overcome those REAL issues, then good luck to you. I'd rather see the walls made good, and serrate away.

This isn't from an adhesive rep. Its from a tiler of 10 years, who as always seeked to improve his knowledge, even if it means eating a few large slices of humble pie. Which i have done, and continue to do.

oh well i had,nt realized you got all them years in the trade
i wish now i had sort your advice before i started the job
Alas i went to the technical department of one of the leading adhesive manufacturers in the world (who sent one of there guys for a site meeting and agreed the proposed method of fixing ) at the meeting were the main contractors structural engineer,the architect, site agent,and the client
all of which have done similar jobs all round the world for 40 odd years
next job of a similar nature i promise to seek your advise as I'm sure your ten years experience would be invaluable
there is one thing you could help me with (im kinda set in my ways) should i stop organizing these 50 k jobs on the back of a *** packet with my oh it,ll be OK attitude
or should i handle it in the professional manner i have for the last 45 years

 

[White Room]

Smoking is bad for you, The back of the shopping list will do

 

[pjtiler]

Smoking is bad for you, The back of the shopping list will do

i dont do shoppin

 

[Branty]

oh well i had,nt realized you got all them years in the trade
i wish now i had sort your advice before i started the job
Alas i went to the technical department of one of the leading adhesive manufacturers in the world (who sent one of there guys for a site meeting and agreed the proposed method of fixing ) at the meeting were the main contractors structural engineer,the architect, site agent,and the client
all of which have done similar jobs all round the world for 40 odd years
next job of a similar nature i promise to seek your advise as I'm sure your ten years experience would be invaluable
there is one thing you could help me with (im kinda set in my ways) should i stop organizing these 50 k jobs on the back of a *** packet with my oh it,ll be OK attitude
or should i handle it in the professional manner i have for the last 45 years

Why do you feel the need to revert to personal attacks?
I'm trying to make a point, that I'm not some 'rep', reading from a book.
Yes you have a much greater experiance of fixing than I do. If you've had an adhesive tech guy see the method you're fixing those tiles, and there happy so be it.
As I said earlier. If you can get the right amount of coverage, at the correct bed depth, then I can't see it matters how you arrange the adhesive behind the tile.

 

[The D]

I think we should get back on track forget exterior cladding it is a different subject we are talking about the domestic application of large format natural stone.

 

[Fekin]

on plasterboard....

 

[grumpy]

Irespective of spankys woes the original debate was simply this and nothing else.Are there circumstances where D&D is acceptable.The work that pjtiler does proves without doubt that there are.
A completly seperate issue is, In what circumstances is D&D acceptable?
i dont think anyone wants to lead that one off do they!

 

[Fekin]

I thought the original debate was wether dot and dabbing travertine onto plasterboard in "Mr Smiths" bathroom was a good safe method.

 

[MICK the Tiler]

All good valid points made for NOT using dot and dab technique Water penatration , differences in air pressure behind tiles all sound and time proven. Another point against D&D is you can get a case of what we call down here MIRROR TRANSFER I'm not sure if it has been mentioned my batteries on the laptop will run flat wadding through 20 pages of posts. What MIRROR TRANSFER does is it will draw the pattern created by the dots and dabs and reflect this through to the front of the tile causing light and dark shading where the D&D are especially servere on stone products but it can and will happen on ceramics and porcelain. You need to comb the wall and also comb the stone as well to create an even solid bed of adhesive wich will be solid across the entire back of the tile.

I still wet bed down here on certain jobs so 3000 odd years of simple techniques are still used today and it will out last any modern adhesive by many many years. Tell a adhesive sales rep that and watch him counter punch with all the techno mumbo jumbo.

 

[grumpy]

I thought the original debate was wether dot and dabbing travertine onto plasterboard in "Mr Smiths" bathroom was a good safe method.

Thats how the thread started but not the debate.