64 –
TANDEM
®
SYSTEM
CONSTRUCTION OF OUTDOOR LIVING COMPONENTS WITH THE TANDEM MODULAR GRID
WOODEN DECK
Warning: We recommend installing a Tandem wall only for
new wooden decks to be built according to the minimum
specifications and data detailed below.
The wooden deck should be built with a structure composed of 2 × 8 joists
spaced every 16
"
(400 mm) or less . The deck beams must be made of
at least two 2 × 8 boards .
The beams are supported on 4 × 4 (89 × 89 mm) wooden posts .
The posts themselves are supported on screw piles designed for
this purpose (helical piles) .
Maximum length of wood joists in both directions: 2400 mm (8 ft) .
Minimum overhang of 300 mm (12
"
) and maximum overhang of 600 mm (24
"
) .
To attach the components of the wooden structure to the deck joists,
you should use #10 stainless steel wood screws .
Simpson Strong-Tie hardware (or equivalent) should be used .
A waterproofing membrane must be installed on top of the wood frame
to protect the wood from water saturation and rot (in the case of wood
board flooring with free space) . The membrane can be omitted for waterproof
deck flooring such as fiberglass .
It is recommended to leave a space of ⅛1/8
"
to 1/4
"
between the wooden
boards of the deck for ventilation under the deck so as not to trap moisture .
WOODEN DECK SKIRTING –
CROSS-SECTION A-A
A Simpson Strong-Tie LUS 26 and LUS 26-2 (GA 18)
galvanized steel joist hangers, or equivalent
B 2x8 continuous rail attached to foundation wall with
Hilti KB-TZU 12 × 140 mm (1/2 in x 5 1/2 in) anchors,
or equivalent
Alternative: joists resting on foundation wall .
C Diagonal brace at mid-height for wall
over 1200 mm (4 in) tall
D Floor coverings 2 × 6 spaced at 6 mm (1/4 in)
Note: During construction, 2 × 4 posts
should face floor joists to enable construction
of assemblies
FLOOR STRUCTURE –
PLAN VIEW
2
×
8
2-2
×
8
2
×
8 @ 16 in c/c
2-2
×
8
4
×
4 Post
Vertical bracing
2-2
×
8 beams
Joists 2
×
8 or Beams 2-2
×
8 (see note)
2-2
× 4
2-2
×
4
DETAIL 4
DETAIL 2
Screw pile Ø 60mm (2-3/8 in) min .
1 .8 m (6 ft) or frost depth according to locality
Diagonal bracing on upright posts
Finished grade
C
DETAIL 3
DETAIL 1
D
A
B
Min . 75 mm
(3 in) clearance
1524 mm
(5 ft)
4 × 4 Post
vertical bracing
(see cross-section B-B)
Diagonal bracing
2
×
6 Floor covering
Spaced every 6 mm (1/4
")
2438 mm
(8 ft)
2438 mm
(8 ft)
300 mm
(1 ft)
300 mm
(1 ft)
600 mm
(2 ft)
2
×
4 @ 1
6 i
n c
/c
2-
2
× 4 e
ac
h s
id
e o
f p
os
t