Q&A for How to Install a Wood Fence Post

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  • Question
    What kind of concrete should I use to set my wooden fence post?
    Mike Garcia
    Licensed Landscape Contractor
    Mike Garcia is a Licensed Landscape Contractor and the Founder of Enviroscape LA, a full-service landscape design and construction firm in Los Angeles, California. With over 30 years of experience, Mike specializes in sustainable landscape practices. Mike holds an Ornamental Horticulture degree, C-27 Landscape Contractor and D-49 Tree Service Contractor licenses, and Permaculture Design, California Naturalist, International Certified Professional Pond Contractor, and Pond Building certifications. He is one of eight Internationally Certified Pond Builders in the world. Enviroscape LA has won landscape and water feature awards from the International Professional Pond Contractors Association (IPPCA), National Association of Pond Professionals (NAPP), and the California Landscape Contractors Association (CLCA). Mike is a past president of the CLCA and currently serves on their local Board of Directors. Enviroscape LA has been featured in PONDS USA Magazine, Pond and Garden Lifestyles Magazine, and the Los Angeles Times. Mike has appeared on Extreme Home Makeover, HGTV's Landscapers Challenge, and A & E's series Fix That Yard.
    Licensed Landscape Contractor
    Expert Answer
    For setting a wooden fence post, I recommend using a quick-set concrete.
  • Question
    How do I set a metal fence post in concrete?
    Anthony "TC" Williams
    Experienced Landscaper
    Anthony "TC" Williams is a Professional Landscaper in Idaho. He is the President and Founder of Aqua Conservation Landscape & Irrigation, an Idaho Registered Landscape Business Entity. With over 21 years of landscaping experience, TC has worked on projects such as the Idaho Botanical Garden in Boise, Idaho. He is a Idaho Registered Contractor and a previously Licensed Irrigator in the State of Texas.
    Experienced Landscaper
    Expert Answer
    The process for setting a metal fence post in concrete is the same method as installing a wooden post in concrete.
  • Question
    I just had fence posts installed with concrete but the top of the concrete is flush with the ground. Can I add concrete on top of the dried concrete to create the sloped mound so water drains away?
    wikiHow Staff Editor
    Staff Answer
    This answer was written by one of our trained team of researchers who validated it for accuracy and comprehensiveness.
    wikiHow Staff Editor
    Staff Answer
    Of course! Just mix up some more concrete and apply it around the base of the posts. Then, use a trowel to slope the concrete down from the post.
  • Question
    How do I build a deer fence?
    wikiHow Staff Editor
    Staff Answer
    This answer was written by one of our trained team of researchers who validated it for accuracy and comprehensiveness.
    wikiHow Staff Editor
    Staff Answer
    Deer fences need to be about 6 feet (1.8 m) tall to keep deer out. Install wooden fence posts about 15 feet (4.5 m) apart. Then, attach woven wire fencing between the posts that extends from the ground to about 5 feet (1.5 m) tall.
  • Question
    I want to make a six foot high fence around my garden. Is it safe to use pressure treated wood for a garden?
    wikiHow Staff Editor
    Staff Answer
    This answer was written by one of our trained team of researchers who validated it for accuracy and comprehensiveness.
    wikiHow Staff Editor
    Staff Answer
    The risk of preservatives leaking into your garden is low, so use pressure treated wood in your garden at your own discretion. Woods treated with alkaline copper quaternary (ACQ) are typically considered safe for garden use. If you want to take extra precautions, line your garden bed with plastic where it touches the wood.
  • Question
    How far should the poles be from each other?
    Community Answer
    This will depend on how big your fence panels are. Usually the panels are 6 feet (1.8 meters) wide.
  • Question
    If a fence has been set in concrete and I need to replace it later with new posts, will the concrete be an issue?
    Community Answer
    If you place posts in concrete, when you have to replace them you'll have to remove the concrete. So just know to be prepared to spend more effort digging up the old concrete and post.
  • Question
    Will the 4x4 fence post warp in the sun before I install the fence boards?
    Community Answer
    Yes. Don't let you posts just sit in the sun. Wait until you have all your materials on site, and then you can set your posts.
  • Question
    I am making a backyard exercise frame with pressure treated wood 4x4s that are 12 feet tall. I'll use galvanized pipe to secure all 4 posts together. I want to use gravel rather than concrete due to a lot of rain in winter. How deep should the post holes be?
    Community Answer
    The rule of thumb is 1/3 length of post, or in this case 4ft. If using gravel only, tamp down all around the posts every few inches as gravel is poured in.
  • Question
    Should I run a string along the top as well?
    Community Answer
    If you want all the tops even, an easier way would be to run a string line after all the posts are set, then mark and trim off the tops of the posts.
  • Question
    Can you please clarify the use of stakes?
    Community Answer
    The stakes are just needed to hold it centered and in place. Once you're finished, they can be removed or left in place, but they're no longer necessary.
  • Question
    Is a 6X6 post really warranted for a 6 foot tall fence or is it overkill compared to a 4X4 post
    Community Answer
    No, but make sure you're using a 10 ft. 4x4's and burying them 4 feet deep. A 6x6 is a bit overkill.
  • Question
    I need to set 24 4x4 posts into concrete on steep terrain to build a fence. How much should I expect to spend on labor costs?
    Community Answer
    Regardless of terrain, labor costs should be the same per hour. What determines labor costs is the length of time it takes to finish the job. An efficient three-man crew could complete your job in a long day (8-10 hours). Cost would vary depending on your location, but you can expect to pay at least $600.
  • Question
    Do the stakes go on opposite sides or adjacent sides? The text says adjacent, pics show opposite.
    Community Answer
    There's no set rule. Usually stakes will go on the owner's side to present a more esthetic appearance to passersby, if it is a solid wood fence. Just for the sake of harmony, if you have nearby neighbors, you might consider discussing your plans with them.
  • Question
    How do I construct a 4" X 4" wooden corner post?
    Community Answer
    It depends on the type of fence. A wood fence should need no extra support. A wire fence will need bracing.
  • Question
    Is wrapping poly plastic around a timber post (treated pine) before setting it in concrete a good practice?
    Community Answer
    Wrapping the post in plastic will retain moisture and speed up decomposing. Priming the post with a stain that soaks into the wood will help to reduce rotting.
  • Question
    In Indiana, does the post have to go below the frost line?
    Community Answer
    Yes, they should always go below the frost line to prevent the posts from heaving with the freezing of moisture in the ground.
  • Question
    What about having the post below the soil frost line? I assume you live in a warm climate.
    Community Answer
    I heard that in Canada the standard used to be 4' deep to be below the frost. Now some people are doing it 3 to 3.5', and it is fine (15 years and standing).
  • Question
    Can a fence withstand high winds if it's attached to concrete with concrete bolts and a post holder?
    Community Answer
    It depends on whether or not the concrete is in good shape (i.e. no cracks). If the post holder makes good contact with the top of the concrete footing, then it should be fine. If the posts aren't secured properly, then the back and forth action of the fence during high winds will eventually cause any post on the line to snap.
  • Question
    Should my posts be unmovable or have a little give?
    Community Answer
    If your posts move a little, then they will eventually move more, so make sure they are solidly in place.
  • Question
    How should I install my fence posts if my property is unsettled?
    Community Answer
    There are 4x4 metal brackets with a large spike extending about 18 inches below. They do not meet codes, but they will allow you to set your post and be able to pull it out later when the area has had time to adjust to disturbances.
  • Question
    If I am setting multiple posts close together for a modern post-only fence, should I do each post individually or run a channel, then set?
    Community Answer
    Dig a hole for each post. A channel is difficult to bury and you have to backfill each area that doesn't have a post in it. It is more labor-intensive to dig a hole for each post but the fence will last longer and be that much stronger in rain and wind, and when the neighbor kids climb it.
  • Question
    If a post gets little loose after a few years, how can I fix it without having to put a new post in?
    Community Answer
    Mix concrete and put it into the cracks. Then cut rebar in 1-foot pieces and pound the pieces with a sledgehammer into the wet concrete to lower the concrete and take up space to hold the post in place.
  • Question
    Can I set wood fence posts far apart if the ground is very rocky?
    Community Answer
    The problem with longer spans is that they can sag. You can counter this by building the span in the form of a truss, ensuring solid joints, all elements should be well drained and by using screws (not nails). The preceding should reduce the risk of larger spans sagging. A simple mid span floating ground support could additionally be used.
  • Question
    Can I tar my wood fence posts?
    Community Answer
    You can. You can also go to a farm supply store such as Tractor Supply Company and get asphalt paint. Paint everything that will be below grade. It will extend the life of a properly maintained fence exponentially.
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