Creating a wet room on a concrete grnd floor

[Grumpie]

I am converting a garage into a bedroom with ensuite facilities. There will be wc, wash basin and a wet room style shower area. I realise it is necessary to tank the walls (dry lined) but as the floor is concrete is it necessary to tank that as well.?

The whole area will be about 2.8m x 1.7m. I've read plenty about wet room floor systems and trays to acheive a fall to a drain. Is it cocher just to screed a fall onto the existing concrete floor and then tile it? I'd prefer to us a corner drains if possible to reduce the amount of excavation work for the drain - good idea or bad idea?

[Sir Ramic]

Take a look at level grade on this site
http://www.impey-uk.com/product-list_39_1_level-grade.php

i saw it at the show today and looked good for your needs
or here
http://bathrooms.designerproductstradeprices.com/index.php?p=product&id=506&parent=40

[Defy]

The impey system is nearly as expensive as their base is and the shallow bases arnt brilliant on concrete as the vibration in the base is a pain. Have a look here just been nosing at it in the wetroom forum. This base looks good for new screeds

[Captain Slow]

I completed a wetroom for a customer last week. I, initially, laid underfloor heating and then chucked a self levelling compound down working the self leveller to create a fall to the corner drain.

I then tanked the walls with Ardex WPC and the floor with Tilesafe (tile-safe.co.uk).

Stuck large format tiles on floor and walls (would have preferred to use a smaller format for the floor but customer refused to allow me to cut tapers in the tiles etc. etc.) It actually worked out well and the water drains away without pooling so "happy days"!