Quick Answer: Will Fence Posts Rot In Concrete?

How do you keep fence posts from rotting in concrete?

Tamp down the gravel.

You can use concrete, if desired, but the moisture in the concrete can sometimes cause wooden posts to rot more quickly, while the gravel allows water to drain quickly away from the fence post and into the soil..

Does wood rot in concrete?

When wood is kept in direct contact with concrete, the moisture in the concrete will be drawn up into the wood, and after a period of time the wood will rot. … when concrete is freshly placed it begins its drying process. when wood is in contact with the concrete, the concrete leaches out its water into the wood.

Should I use concrete for fence posts?

Concrete is the most secure material for setting fence posts, especially if you have sandy soil. Gravel may be okay with dense, clay-heavy soil, but in looser soil, concrete is the only thing that will truly keep your fence posts stuck in place.

How long will untreated fence posts last?

4 to 7 yearsBecause natural durability varies greatly, all untreated woods will have a few early failures. Posts from nondurable-heartwood species, or posts that are largely sapwood, will have an average service life of 4 to 7 years; these posts should be treated with a preservative.

How long will wooden posts last in concrete?

5-8 yearsThe guy who originally put them in says they typically ‘go’ between 5-8 years and is recommending I replace with concrete posts at considerable extra cost.

How long will a treated post last in concrete?

5 to 10 years5 Answers. A PT post will last a long time in concrete, maybe 5 to 10 years in soil alone. I suggest you embed the post in concrete, trowel a peak around the post so water runs off, and don’t let the PT post come in contact with the ground.

How do you fill a large hole in concrete?

Using a Chisel, Make the Crack Wider at the Bottom than the Top. … Clean Out the Debris with a Stiff Fiber or Wire Brush. … Fill the Crack with Patching Mix (also know as Vinyl Concrete) … Address Any Pop-Outs. … Wet the Surface and Apply a Concrete Bonding Agent. … Pack a Small Amount of Anchoring Cement into the Hole.

What causes fence posts to rot?

The main cause is the wood having prolonged exposure to moisture in soil which means fence posts decay at ground level – just above the concrete base. This means the post will still be solid below and above the damaged area. Insect infestations can also cause rotting in wooden fence posts.

How long does a pressure treated post last in the ground?

40 yearsAccording to Forest Products Laboratory and other research agencies, pressure treated poles in the ground can stay up to 40 years without any signs of rot.

How long will a 4×4 post last in concrete?

But young pressure-treated decks, many less than 10 years old, are being shoveled into landfills. Click to see full answer. Beside this, how long does a 4×4 post last? Depending on the species, cedar may last for about 15-30 years, spruce may last for about 4-7 years, and pine may last for about 5-12 years.

Is 2 feet deep enough for fence posts?

The minimum depth that you should dig your fence post holes for panel sections is 2 feet. A general formula is to dig the holes one-third to one-half of the post’s aboveground height. The deeper you dig the holes, the more stability your fence has, but you must also purchase longer posts.

How long will a 6×6 post last in concrete?

40 yearsThe treated post that are rated for ground contact are guaranteed for 40 years.

How many bags of concrete do I need for a 4×4 post?

Mix two 50lb bags of concrete with water in a mixing tub or 5-gallon bucket. Add concrete into the hole and around the 4” x 4”. Depending on your climate, let concrete set up for 24 – 48 hours.

Why deck posts should not be set in concrete?

When concrete is poured around a deck post in this way, the post will rot due to moisture buildup by the soil. … Concrete tends to absorb moisture and wood expands when it gets wet, so these two factors combined will result in the wood breaking the concrete.

How long will a pressure treated 4×4 post last in the ground?

The Forest Products Laboratory and other research groups have shown that treated wood stakes placed in the ground for more than 40 years remain rot-free. But young pressure-treated decks, many less than 10 years old, are being shoveled into landfills.

Do pressure treated posts rot in concrete?

Simply setting the posts in concrete does create a condition that will accelerate rot in the bottom of the posts. With pressure-treated posts, the rot will be slow. … This allows any moisture that gets between the concrete and the bottom of the post to percolate through the gravel and away from the bottom of the post.

How long do fence posts last in the ground?

Reason being that the old chromated copper arsenate (CCA) wood treatment was banned in 2004 and modern treatments are no where near as good. Life expectancy of posts now is anywhere from 18 months to 5-7 years max.

What do you treat fence posts with?

Treat the Post With Preservatives Soak the bottom of the posts in a wood preservative containing copper napthanate, such as Cuprinol. Note: Available at some paint stores and home centers, this wood treatment is specifically designed for in-ground applications.