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P a g e
1.5
POST-IN-GROUND SYSTEM
1.5.1
What is a Post-in-Ground anchoring system?
As the term indicates, Post-in Ground, means that the vertical posts for a pergola are inserted deep into concrete footings and
anchored in that way. The depth of the footing and the length of the post required to be embedded into the footing is
determined by the maximum depth of the frost line for a particular area. The diameter of the footing is determined by the
weight each post applies to the footing. A 4x4 pergola that uses 8 ft posts and 8 ft headers weighs approximately 400 lbs. If you
add headers, a swing or hammock, you must consider the additional weight. Consult your local building codes to determine the
required footing depth and diameter. If you fail to follow local guidelines and create a footing that is too shallow, it can lead to
the post and footing heaving upward when the ground freezes during the winter. This can permanently damage the Pergola and
render it unsafe for use.