How many mm for tile spacers?

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How do you decide how many mm tile spacers to use? Whats the pros/cons for larger or smaller spacers?

I have 80x80 floor tiles and my wall tiles vary around 1000x330. Was thinking 2mm, but is 1.5mm too less?
 
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3mm is recommended min spacer size for floors but I often use 2mm. The smaller you go the flatter, squarer and generally better quality your tiles need to be. Personally I wouldn't go smaller than 2mm.
 
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Is there technical reason as to why it should be more than 2 mm ie to allow for movement or some other reason?
 
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i was told at topps tiles 3mm for floor tiles to allow for movement especially as, mine were going in an open porch way, he said we may get away with 2mm , as thats what my wife wanted, but I went for 3mm, don't want to have to redo because of movement/cracking
 
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If your tiles aren't perfectly square, exactly the same size or are slightly warped then a larger spacer will disguise the problems and allow you to keep to the layout.
 
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If I have no architraves yet do I tile up to the door lining band pit architrave over the tile or architrave first then tile up to it?

I guess if I ever change the tile in figure then I’d have to rip out the custom made architrave which matches the skirting.

What’s the norm in such situations?
 
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My norm is to undercut the architrave and door lining and slide the tiles underneath. It only needs to go under a little bit and looks much neater.
 
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But surely you’d mastic the end where the tile meets the architrave anyway so Surely it wouldn’t make much difference would it?
 
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Yes, that's true. It's just what I do and it saves all the fiddly profile cuts around the architrtaves. Your choice though.
 
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makes a huge difference , like cutting laminate flooring under the frames and architraves. it’s the difference between pro and diy. depends what your’e happy with.
 
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