Alternative to a thin screed

[jasonj]

Okay so I ask this here as Richard C kindly pointed out this forum on a comment I made on the flooring forum.

Situation is, the recently-laid concrete slab in my kitchen and bathroom is 25mm below the level of the top of the floorboards in the dining room (which adjoins the kitchen, which itself adjoins the bathroom).

The floor tiles will probably be 10mm, the tiling adhesive 3-4mm, leaving about 11-12mm, which I believe is too thin for a screed.

Self-levelling compound for my purposes is too expensive so I was going to lay cement board which is 6mm; 6mm plus 5mm of mortar (to bond to the concrete slab) makes 11mm.

http://www.insulationexpress.co.uk/Specialist-Board/James-Hardie-HardieBacker-250-Cement-Board.htm

Does this make sense? Would anybody do it differently?

Thanks.

 

[tictic]

12mm.... if your want it done right well a slc a fibrebased one
will do that in one run no probs mate...aint that dear...weber/mapei...


how big an area is it m2?..

or 10mm insulation boards down on thinset..

let the slab cure first tho...

 

[jasonj]

Hi tictic

Sorry, what's an SLC?

The area is about 12m2.

You said insulation boards (I presume something like Celotex?) but there is Celotex under the slab; I would have thought cement board would be better because, well, it's a lot stronger! Not sure I feel comfortable about laying tiles on Celotex .....unless I've misunderstood you.

Thanks
Jason

 

[tictic]

jasonj
slc,...is a self level compound mate....

http://www.netweber.co.uk/tile-fixi...rep-preparation-products/weberfloor-flex.html

 

[tictic]

jasonj
slc,...is a self level compound mate....

http://www.netweber.co.uk/tile-fixi...rep-preparation-products/weberfloor-flex.html

 

[tictic]

http://www.mapei.com/GB-EN/product-detail.asp?IDProdotto=511&IDTipo=1614&IDLinea=1


sorry for double post above.....aint that hot on a pc bud...

 

[tictic]

http://www.marmox4u.co.uk/marmox_insulation.php


hope all of the above helps in a small way ..bud...

best off
tictic


my wee boy is kickin ma arse on the wii to night...my fingers are KILLING me....

 

[jasonj]

Thanks mate for the links. The marmox board looks good.

Just wondering, how do you lay it on concrete? I.e., how is it bonded? With mortar? and if so, is that with sharp sand or builders sand? Thanks!

 

[jasonj]

Scrap that - I just found this
http://blog.floorheatingonline.com/how-to-lay-marmox-on-a-concrete-floor

 

[tictic]

Scrap that - I just found this
http://blog.floorheatingonline.com/how-to-lay-marmox-on-a-concrete-floor[/quote


sweep the floor.
prime the floor with sbr or acrylic primer.
using a single part flexiable adhesive comb the subtrate with a 6mm+ notched trowel,fix boards (staggered)...

roberts yours mums brother...

 

[jasonj]

Thanks!!