Please see below an example M41
specification intended to provide a guide for installation.
You can download this information as a PDF at the foot of the
page.
M41
Pre-Cast Terrazzo Tiling
110
-LOCATIONS:
Terrazzo tiling to entrance hall
and lift lobby floors on levels Ground to 7.
-STANDARD:
Tiles to be produced to BS EN
13748-1: 2004.
-MANUFACTURER:
Kengate Terrazzo, Littleton
Lane, Shepperton, Middlesex, TW17 0NF, T-01932 568 672.
-PRODUCT REFERENCE:
Prima Range, ref-PR03.
-SIZE AND THICKNESS:
300x300x28mm.
-SUBSTRATE:
Newly laid concrete structural
slab.
-PREPARATION OF SUBSTRATE:
Substrate to be sound and level,
suitably clean and free from cracks and other defects before
bedding and terrazzo tiles are installed.
-BEDDING AND BUILD UP HEIGHT:
Terrazzo tiles to be laid onto a
bedding mix of course sharp sand and Portland cement (OPC) in a
ratio of 4:1.
Bedding to be fully bonded to
the structural slab.
Ensure sand and cement is mixed
to a semi-dry consistency.
Bedding and terrazzo tiles to
meet the required finished floor level of 70mm above structural
slab level.
230
-SAMPLES:
Submit 4no. representative
samples size-100x100x28mm of tile ref: PR03 to form range
samples.
All tiles produced and installed
are to be as per the approved range samples.
235
-CONTROL SAMPLES:
Complete one area on site of
approximately 1m2 to consist of a fully installed, working
terrazzo floor in 300x300x28 format tiles.
This area is to form a
representative control sample for the entire works.
All terrazzo tiling, bedding and
grouting works to be installed as per the approved control
sample.
This area is to incorporated
into the finished works after acceptance.
305
-FIXING:
Set out tiling from the centre
of all lobbies.
Ensure thorough compaction of
bedding before tiles are fixed.
Prior to fixing, butter the back
face of the terrazzo tiles with cement slurry to provide a key.
Fix tiles and firmly beat into
position using rubber mallets so as not to damage the surface of
the tiles.
Tiles to be fixed fully adhered
to bedding.
Periodically select random tiles
that have been installed and remove them to check proper
adhesion to bedding has occurred.
Re-butter the back face of the
removed tiles and replace.
Edges of cut tiles to be neat
and tidy.
Joints in the tiles to be true
to line, continuous and without steps.
Grout joints as soon as possible
after bedding has sufficiently set to prevent disturbance of
tiles.
Flood joints with cement based
grout, remove excess from surface and allow 3 days for curing.
Grout colour to match tile
matrix of PR03.
330A
-LEVEL OF FINISHED FLOOR
When checked under a 2m long
straightedge with 3mm feet at either end, placed anywhere on the
tiled surface, the floor tiles should not obstruct the
straightedge and the gap should be no greater than 6mm.
350A
-PREPARATION FOR FULLY BONDED
BEDDING
The newly installed concrete
structural slab should be left exposed to cure for a minimum of
6 weeks before tiling installation takes place.
Prior to laying bedding, the
surface of the slab should be inspected for visible defects or
irregularities.
The slab should be thoroughly
cleaned and cleared of all dust and debris.
Keep the surface wetted for
several hours before laying bedding.
Pour over a coat of water and
cement slurry in a ratio of 3:1, to provide a key for bedding.
465
-METAL SECTION MOVEMENT JOINTS:
As produced by Donmini (UK) Ltd,
Foxley Works, Redhills Road, Milton, Stoke-on-Trent, ST2 7PE,
T-01782 536719
Product ref: TGF1 ‘foamtail’
with 1mm thick Stainless Steel side-plates.
Side-plates to extend down at
least 40mm to allow dowel-reinforcing rod to clear the terrazzo
tiles.
Width of joint to be as required
to take site movement tolerances.
Coloured vamac rubber insert to
be beige to match as closely as possible the PR03 tile matrix
and grout.
Depth of joint to be as per
required FFL build up from SSL.
Installation of joints to be
incorporated into the fixing process of the terrazzo tiles.
Joints to be installed level
with the terrazzo tiles.
There should be no lipping or
depressions between terrazzo tiles and level of the joints in
excess of 3mm.
Joints to be installed in
maximum 10m2 bays and set parallel out from the centre line of
all lobbies.
520
-MECHANICAL GRINDING
Install adequate protection to
surrounding areas abutting the terrazzo tiled floor.
Ensure terrazzo tiles have been
wetted down sufficiently before polishing.
Mechanically polish the floors
using a gas powered Turco and/or a 110v Ellis machine.
Ensure power is provided through
a 5kva transformer.
Mechanically polish the floors
using 36 and then 60 grit stones.
Remove residue from floor and
re-grout as per 305.
Allow 3 days for the grout to
cure.
Mechanically polish the floors
for a second time using 80 grit stones and remove residue.
Clean the floor tiles and allow
sufficient time to dry out before applying a hardener product as
per 540.
540
-CHEMICAL FLOOR HARDENER
As produced by Conren Ltd,
Redwither Road, Wrexham Industrial Estate, Wrexham, LL13 9RD
T-01978 661991
Product reference: Lapidolith
terrazzo/concrete hardener.
Product to be applied as per
manufacturers instructions.
Remove any excess hardener to
prevent product drying out on the surface of the tiles.
550
-PROTECTION
Adequately
protect areas of completed work from damage and contamination by
using 2mm thick sheeted correx, or similar, taped and secured
along joints.
