CFI Post Setting & Foundation Work Flashcards
6 cards from real CFI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CFI Post Setting & Foundation Work flashcards as text
What is the minimum recommended depth for a fence post in most US soil conditions?
Answer: One-third of the total post length
Industry standard requires fence posts to be buried to one-third of their total length to provide adequate stability and resistance to lateral forces.
Which concrete mix ratio is most commonly used when setting fence posts in the US?
Answer: 1 part cement : 2 parts sand : 3 parts gravel
A 1:2:3 mix (cement:sand:gravel) provides sufficient compressive strength for fence post footings under typical residential and commercial loads.
What is the primary purpose of flaring the concrete footing at the bottom of a fence post hole?
Answer: To increase resistance to frost heave and uplift forces
A belled or flared footing increases the bearing surface area, anchoring the post against frost heave and upward pull forces.
In cold climates, fence posts should be set to what depth relative to the frost line?
Answer: 6 to 12 inches below the frost line
Posts must extend 6–12 inches below the local frost line to prevent heaving caused by freeze-thaw cycles.
Which tool is used to ensure fence posts are set perfectly vertical?
Answer: Both B and C are acceptable methods
A 4-foot level checked on two perpendicular faces and/or a plumb bob both confirm true vertical alignment of fence posts.
What is the recommended minimum diameter of a post hole relative to the post itself?
Answer: Three times the post diameter
Post holes should be at least three times the diameter of the post to allow adequate concrete coverage on all sides for a strong footing.