Quick Answer: How Long Do Treated Posts Last In Concrete?

Do pressure treated posts rot in concrete?

A: Actually, your point is well taken.

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.

Concrete should be poured around the post – no concrete under the post..

How do you keep fence posts from rotting in concrete?

The ideal solution is to eliminate contact between soil and wood. Using a metal post anchor set in concrete is probably the most effective method for achieving maximum longevity. To help keep the post from wicking water, choose an anchor that spaces the post bottom away from the concrete.

Will pressure treated wood rot if buried?

Pressure-Treated Wood Makes the Grade Pressure-treated wood in contact with the ground needs the most protection, and will rot in just a few years if you use the wrong grade. … If your wood will touch the ground or be buried, you should get the highest grade you can, up to .

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 do you keep pressure treated wood from rotting?

Pressure treated wood can crack and split from water exposure and this will allow fungi to get into the cracks and create wood rot. If you have a pressure treated deck this can be a harder problem to avoid. The best way to protect from pressure treated wood rot is to apply a deck preservative.

Can you put dry concrete in a post hole?

Fast-setting concrete is ideal for setting posts because there’s no mixing—you simply pour the dry concrete from the bag right into the hole, then add water.

How long do pressure treated fence posts last?

A properly pressure treated pine fence posts, for example, can exist for a range of 20–35 years if well installed while the untreated one only lasts between 3–7 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 many bags of concrete do I need for a post hole?

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.

What is the life expectancy of pressure treated wood?

40 yearsPressure-treated lumber is ideal for outdoor construction as it has a long, useful life span and is much less expensive than alternatives. Treated wood can last more than 40 years.

How deep should post be for 8 foot fence?

The depth of the post hole needs to be 1/3 to 1/2 the height of your fence. For example, if you are building a fence that’s 6 feet tall, you will need a hole that is at least 2 feet deep. That also means that you’d need to use an 8-foot post. The hole will need to be about 3 times the width of your post.

Is 18 inches deep enough for fence post?

The general rule of thumb when setting a post is that the depth of the post’s hole needs to be one-third to one-half of the actual above-ground height of the post. … For our six-foot-high fence post, we would need a hole that’s 36 inches deep and 12 inches in diameter.

How long will pressure treated lumber 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.

Should I use concrete for fence posts?

Setting Fence Posts in Concrete 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.

Can pressure treated wood sit on the ground?

Pressure-treated wood is softwood lumber, typically southern yellow pine, that’s been chemically treated to resist rot, decay and termites. Lumber treated to “Ground Contact” has a high chemical retention level and can be placed directly on or in the ground with better protection against rot or decay.

Do you need to seal pressure treated wood?

However, most pressure-treated wood should have periodic sealing against moisture, preferably every year or so. …

Should I use 4×4 or 6×6 fence posts?

Instead of 4×4 posts, go with 6×6 posts. The extra size makes a huge difference. It’s a smart place to invest a little extra in your fence, because if your posts distort after they have been set in the ground with concrete, they are extremely difficult to replace.

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

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