NBS Specification Guide Colinwell Architectural Masonry block walling Tel. 02890 618145, Fax. 02890 624240
SPLITFACE MASONRY
253C CONCRETE FACING BLOCKWORK . . . . . . . . .
F10 255
(Edited version of NBS clause 255)
-3.
Standard Splitface Masonry Blocks
- Manufacturer: Colinwell Concrete
Concrete facing blocks with the appearance of riven stone.
Product Reference: Splitface Architectural Masonry
Clause heading: Insert, e.g. FOR OUTER LEAF OF
- Compressive Strength:
CAVITY WALLS:
Mean value: . . . . . . . . N/mm²
Configuration: Insert group 1, 2 or 3 as per BS EN 1996-1-1.
Characteristic value: . . . . . . . . .N/mm²
Group 1 ≤ 25% formed vertical voids by volume
Category: I
Group 1 ≤ 25% TO 60% formed vertical voids by volume
- Freeze/Thaw Resistance: as BS 5628-3:2005 Table 12
- Work Sizes (length x width x height): . . . . . . . . . . . . . . .
- Finish/Colour: . . . . . . . . . . . . . .
Compressive strength: 10.5 N/mm²
Freeze/Thaw Resistance: Insert, as BS 5628-3:2005 Table - Special Shapes: . . . . . . . . . . . . .
- Additional requirements: . . . . . . . . . . . .
12
Work size(s): Standard face size and thickness
combinations are:
- 390 x 190mm and 195mm thick.
- 440 x 215mm at 95mm, 140 and 215mm thick.
95mm thick block available only in solid configuration,
140mm available only in cellular configuration 195 and
215mm available only in hollow configuration.
Finish/colour: Insert from the following choice Natural,
Heather, Honey, Straw, Buff, Red, Brown, Cream, Green,
Ochre, Salmon, Oatmeal, Bracken, Sandstone, Whinstone,
Brown, Slate Blend, Russett Blend, Abbey Blend and
Brindle Blend..
Special shapes: The following options
are available:
Split Fluted Block S4(440 x 107 x 215mm)
Split Scored Face F44 (440 x 107 x 215mm) and Split
Ledge S7 (440 x 107 x 215mm)
- Quoin D1S 440 x 95 / 215 with 215mm return
Corner Special F15 330 X 95 X 215mm
).
Mortar mix
In normal conditions a 1:1:6 cement:lime:sand mortar
is suitable. It is recommended that the mortar be
waterproofed and tinted to compliment or contrast
with the blocks colour. Any surplus mortar should
be removed with a trowel immediately, otherwise
the face of the block may be permanently marked.
The joints should be compacted with a jointing tool,
taking care to give as consistent a finish as possible.
For best appearance we usually recommend pole/
bucket handle jointing. Blocks should also be built
at random from 3 cubes/bales in order to minimise
any possibility of a colour banding effect.
.
Special requirements: Colinwell recommend the use of
Colinwell LSM where premixed lime:sand is specified in the
mortar mix. The following Colinwell colour references are
suggested to complement the colour of the blocks, but
specify a reference panel using NBS clause 740 to ensure
the match is suitable for individual
s section Z21.
- Standard: . . . . . . . . . . . . .
- Mix: . . . . . . . . . . . . .
- Additional requirements: . . . . . . . . . . . .
-
Colinwell
Masonry
Colour
Natural
Heather
Honey
Straw
Buff
Brown
Bracken
Whinstone
Red
Sandstone
Oatmeal
Ochre
Salmon
Cream
Green
White
Brindle Blend
Slate Blend
Abbey Blend
Russett Blend
Colinwell
Mortar
Colour
Standard Mortar
Maroon U43 Mortar
Tan C30 Mortar
Yellow D10 Mortar
Biege E74 Mortar
Brown H21 Mortar
Maroon U53 Mortar
Black L62 Mortar
Orange T36 Mortar
Cream G89 Mortar*
White J88 Mortar*
Ochre R95 Mortar*
Coral A80 Mortar*
Cream G89 Mortar*
Green N70 Mortar*
White J88 Mortar*
Orange T36 or Brown H21 Mortar
Standard or Black L62 Mortar
Biege E74 or Brown H21 Mortar
Orange T36 or Tan C30 Mortar
*For these colours, we recommend that white
cement is used in the mix. For all other colours,
grey cement (OPC) is suitable.