FIXING STONE TO FLOORS
Solid floor substrates
Generally speaking, the best floor surface to
fix stone to is a sand and cement screed. Please
check with your builder that the screed is
definitely sand and cement and not an
anhydrous screed. Anhydrous screeds require
special preparation – please contact the
Technical Helpline for further information.
If the screed is old or uneven then a certain
level of preparation will be needed – please
contact the Technical Helpline for further
Underfloor heating works very well with
stone and is highly recommended to provide
that additional level of comfort. Underfloor
heating for solid floor substrates comes in
two key forms: a heated screed, in which hot
water pipes or electrical cables are buried;
and under-tile heating, in which an electric
mat or loose cables are laid over the top of
the screed just under the tiles.
If your screed is heated, then you must use a
proprietary decoupling membrane between
the screed and the stone – heated screeds
expand and contract as the screed heats up
and cools down and this lateral movement
will eventually cause the stone to crack if a
decoupling membrane is not used.
Non solid floor substrates
Stone can be installed to most non solid
substrates – but careful preparation is
needed. Please contact the Technical
Helpline for assistance.
FIXING STONE TO WALLS
When fixing stone to walls, it is a good idea
to select a thinner stone. Also a smaller
format will be simpler to fit – particularly on
uneven walls. Some circumstances may
require a mechanical fixing system to be used
as well as the normal stone adhesive.
Solid wall substrates
The best solid wall substrate to fix stone to is
a sand and cement render. Your builder will
be able to confirm what the substrate is.
Plastered walls will need scoring and priming
before fixing stone.
Non solid wall substrates
The best non solid wall substrate to fix to is a
proprietary tile backer board, which is
specifically designed to receive tiles.
Generally speaking a plasterboard wall is not
strong enough to support the weight of
stone, and plywood is not stable enough to
This guidance is provided as an initial
indication of factors you need to consider.
You should also seek the advice of a
professional tiler/installer who can give you
advice based on the specific conditions on
site. All substrates should be prepared in
accordance with the relevant British