ceranic tiling over timber floor

g'day Im tiling over timber floors as i want a hard wearing floor. my question is are control joints really necessary every 5metres as recommended by the web sites. I want to lay them in a diamond pattern and don't want to have to cut through the pattern to make the joint. The area is about 80m2 in total lounge,family,hall way,entrance and kitchen all open plan. I thought that if i leave 10 to 15mm gap at the walls with skirting replaced on top of tiles and use silicon instead of grout at the cupboards etc.... I'm thinking this will allow the floor to move enough without causing tiles to crack. I was told by someone to leave a 2mm gap between the ctu ( cement tile underlay) sheets to allow for movement. The james hardy site says ctu sheets should be layed flush together. As im not an experienced tiler but have some experience on small jobs any advice would be much appreciated. Also can ctu be layed using a nail gun. http://www.renovateforum.com/images/.../2thumbsup.gif :2tsup:


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