Over the past few weeks we have been talking about conventional ground anchors as the tie down system for manufactured homes. But let’s look at some alternative anchoring systems that might be able to simplify the process for you.
As always, make sure that the manufacturer has approved whatever system you choose and that it is also approved by their Design Approval Primary Inspection Agency (DAPIA). If you are in a state that has oversight authority, make sure they approve it as well. To the best of my knowledge, the three systems that we are going to look at today are approved by most manufacturers. But, never take my word, you need to get copies of the approvals for your installation files.
Let’s take a quick look at the:
All Steel Foundation from Oliver Technologies Click Here for Oliver Technologies
L & L Bracing System (LLBS) from Minute Man Click here for Minute Man
Xi2 from Tie Down Engineering Click Here for Tie Down Engineering
I am a big fan of all three systems. They are much easier to install than conventional ground anchors, and they will save you significant time as they install quickly. While the systems are similar in many regards, they do have differences, so make sure you follow the instructions particular to the system you choose. We will limit this discussion to manufactured homes installed in Wind Zone 1.
Here are the some of the similarities of the three systems:
Only 2 devices (opposite corners of the home) are needed to anchor a typical 2 section manufactured home. 5/12 roof pitch and greater would require three or more systems.
For single section homes, typically you will need two devices and a ground anchor installed at each corner of the home.
The systems are limited to a home with a maximum pier height of 48”.
The systems can be bolted or “wet set” into frost protected concrete footings.
They are easily adapted to address longitudinal anchoring.
When using these systems, it is important to make sure you don’t mix parts. If you are using the Xi2, don’t use parts from Minute Man or OTI, if installing the OTI, don’t use Tie Down or Minute Man parts. I also believe that for multi-section homes it is important that your fastening at the marriage line be consistent with the installation instructions for the home being installed. Watch for gaps between the sections that may impede the transfer of wind load across the marriage line (this is true of all manufactured home installations).
If you are not using these systems, I encourage you to reconsider. All three producers provide exceptional customer support. They have comprehensive information on their websites including videos, and are very helpful on the phone and in person!
From my perspective, it is a rare occasion when a manufactured home installed using conventional ground anchors is anchored properly; site grading, rocky soils, underground utilities, and frost depths make conventional ground anchors a challenge for many installers. However, installers using these alternative systems have had great success with these products.