adhesives and trowels

[CRAIG G]

just finished what i thought was a wee job, ended up having to re plaster walls. i had to use a 10mm notched trowel for the 250mm x 400mm tiles and it just eats up the adhesive but what i was wondering was why is normal adhesive not adequate for large format tiles, whats the difference betwwen normal adhesive and large format stuff?

 

[Gazzer]

explain what you mean by "normal adhesive " ?

 

[CRAIG G]

just like most stuff sitting on the selfs of B and Q and the likes, alot said only for tiles up to 300mm x 300mm

 

[Gazzer]

Do you mean ready mixed ?

 

[CRAIG G]

example, mapei shower proof

 

[DHTiling]

Are talking about tubbed adhesive


Sent from my iPhone

 

[CRAIG G]

yeah ready mixed

 

[Gazzer]

Tubbed stuff is dispersion adhesive and needs air to dry it out. So if you use it on a large format tile the air will not be able to get to all the adhesive. Cement based adhesive works by water being the catalyst which makes the adhesive set within a given time.

 

[Gazzer]

Looks like you have done a course, were you not taught this ?

 

[Gazzer]

Also 10mmm trowel for dispersion adhesive is too big. Should be 6mm.