TANDEM
®
SYSTEM
–
57
CONSTRUCTION OF OUTDOOR LIVING COMPONENTS WITH THE TANDEM MODULAR GRID
DESIGN ASSUMPTIONS
The construction of privacy walls or fences
must take into account the following assumptions:
Wall weight (grid and veneers): 28 lbs/sq ft (1 .35 kN/m²)
Wind: 20 lbs/sq ft (1 kPa)
Minimum allowable bearing capacity of soil: 1,575 lbs/sq ft (75 kPa)
Density of soil around pillars and foundations (y): 112 lbs/cu ft (18 kN/m³)
Backfill must be compacted around Sonotubes and spread footings
Minimum depth of foundations: 6 ft (1 .8 m) away from frost
(consult an engineer to check the typical depth of frost for your area)
Note: Design assumptions do not take into account earthquake effects .
It may be necessary to consult an engineer .
Leave a free space under the Tandem wall of at least 75 mm (3
"
)
to ensure proper ventilation and adequate room for the potential effects
of freezing and thawing .