Tie Down Xi2 Foundation System - Manual

Xi2
Ground System
(For Block)
Xi2
Ground System
(For Steel Pier)
Xi2 Ground System
with Longitudinal Stabilization
(One Longitudinal Strut for Wind Zone I
Two Longitudinal Struts for Wind Zones II & III, [Shown Above])
Instruction #08108
101613,D975
REQUIREMENTS
• Install in any type soil, 4B (175 – 275 lbs.) or better.
• Main Rail spacing must be 75.5” – 99.5”, 112” exception with proper strut.
• Maximum pier height at system is 48”.
• Wind Zones II & III require sidewall anchors for up lift, check manufacturers requirements.
• Maximum vertical projection at sidewall is 9’ (wall and eave). Higher walls may be used when design loads are
adjusted accordingly.
• Longitudinal strut angles need to be no more than 50 degrees and no less than 25 degrees. See page 4.
• The Xi2 ground pad is installed under, and serves as the footer for one of the piers required by the home
manufacturer installations instructions.
• Two systems designed to work in conjunction with each other must be placed as evenly as possible. Measuring
from the center of block/pier on the Ground Pad, systems are to be placed no less than 2’ and no more than 10’
from each end of home. Components of the Xi2 system such as the longitudinal strut and connecting hardware may
extend beyond the pier location. Additional systems per instructions, see page 4.
• For roof slopes greater than 20 degrees, (4.37” in 12” Pitch) see page 4.
• This System only replaces normal lateral frame tie and or longitudinal end tie anchorage. The home manufacturer
may require additional vertical anchor ties that are unique to a home’s design. These locations may include shear
walls, marriage line ridge beam supports, and rim plates. Check the manufacturer’s installation instructions for
set-up requirements.
Xi2 components exceed HUD code 3280.306 g “Anchoring equipment exposed to weathering shall have a resistance to
weather deterioration at least equivalent to that provided by a coating of zinc on steel of not less than 0.30 ounces per
square foot of surface coated.
Ground Foundation System
Installation Instructions for Wind Zone I, II & III
Except Florida and California
By Tie Down Engineering
Updated: 10/16/2013