Ground anchors are plates or augers placed in the soil to supplement manufactured homes by limiting lateral building movement. Particularly important during high wind events, earthquakes and floods, properly applied ground anchors can save lives and property. Different kinds of ground anchors or systems are best or most suitable for different geographic locations, climate or soil type and purpose.
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Plate anchors, or "manta ray" type anchors are most applicable for areas with earthquake activity. This type of ground anchor has large anchor plates (as large as 6-by-6 inches) that can be driven 18 feet into the ground. The plate is rotated with a second steel rod and pulled back to lock it firmly in place. A galvanised, threaded rod connects the plate to the chassis. Installation of this system type requires a certified crew.
Auger ground anchors are the most common type of anchor. They can be used with a diverse array of piers. Anchors have a single or double helix base and may include a lateral stabiliser near the anchor head. The base is a 4- or 6-inch circular, spiralling plate. Anchor heads are held to the home's chassis with steel straps. Anchors that have not been galvanised will lose their corrosion resistance during installation.
Rock and Drive Anchors
Rock anchors are a variation of helix or auger anchors that can be installed in solid rock. These typically consist of steel rod anchors encased in a poured structural fill collar or are pinned with steel stakes. Drive anchors can be used in hard or rocky soil, making them suitable for use in coral soils of coastal areas or similarly textured soils.
It may be possible to utilise a ground anchor system to convert a foundation to a permanent foundation, allowing the home to qualify as real property. This may consist of using all-thread rods to tie the chassis into an anchoring material poured into excavated cavities.
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