TANDEM
®
SYSTEM
–
19
A
C
D
B
F
E
G
There are four ways to build a double-sided wall:
Using only Lafitt or Melville Tandem 90 units
Using only Lafitt or Melville Tandem 180 units
Using a mix of Lafitt or Melville Tandem 90 and 180 units
in the same wall
Using only Esplanade Tandem units
To build a solid structure, the empty space inside the double-
sided Tandem unit must be filled with 20 mm (3/4") clean stone
on every second row . Before installing the capping, tap lightly
on each side of the wall with a rubber hammer to help compact
the aggregate between the veneer units .
Double-sided Tandem units are randomly installed on starter
units, using an equal number of all units . The same installation
patterns as for retaining walls are used here (see the installation
patterns in the “Retaining Wall” section) . Each veneer unit
of the first row must be glued to the starter units with the
Permapro concrete adhesive .
BUILDING A DOUBLE-SIDED WALL
150 mm (6") min .
711 mm (28 in) max
DOUBLE-SIDED LAFITT or MELVILLE TANDEM
WALL WITH 90 mm VENEER UNITS
Note: Quantity of connectors required:
Lafitt and Melville Tandem 90 wall
7 connectors per sq . ft of double-sided wall (74 connectors
per m
2
) based on one of the sides of the wall
Lafitt and Melville Tandem 180 wall
5 .5 connectors per sq . ft of double-sided wall (57 connectors
per m
2
) based on one of the sides of the wall
Esplanade Tandem wall
2 .5 connectors per sq . ft of double-sided wall (24 connectors
per m
2
) based on one of the sides of the wall
For a double-sided Lafitt, Melville and Esplanade Tandem wall, we
recommend gluing all of the rows together .
STRAIGHT DOUBLE-SIDED WALL
When building a straight wall, assemble
veneer units of the same
size using the double-sided connector . Because the
veneer units
come in different lengths, several layouts are possible .
TYPICAL CROSS SECTION
A Capping unit (for double-sided wall)
B Veneer units
90 mm × 67 mm × variable
(3 9/16" × 2 5/8" × var)
C Double-sided connector
D 20 mm (3/4") clean stone
E Granular base 0-20 mm (0-3/4")
compacted 300 mm (12") min .
F Minimum buried depth 150 mm (6")
G Starter unit
90 mm × 200 mm × 400 mm
(3 9/16" × 7 7/8" × 15 3/4")
UNITS A – A
90 mm × 67 mm × 201 mm
(3 9/16" × 2 5/8" × 7 7/8")
UNITS B – B
90 mm × 67 mm × 268 mm
(3 9/16" × 2 5/8" × 10 1/2")
UNITS C – C
90 mm × 67 mm × 335 mm
(3 9/16" × 2 5/8" × 13 3/16")
UNITS D – D
90 mm × 67 mm × 402 mm
(3 9/16" × 2 5/8" × 15 13/16")