How Long Will A 4×4 Post Last In Concrete?

Do pressure treated posts rot in concrete?

Pressure-treated wood will rot in concrete when exposed to wet conditions such as trapped water.

In optimal conditions, pressure-treated wood set in the earth may last as long as 40 years.

However, when vertically set in a non-draining concrete base, pressure-treated wood may last only a few years..

Does concrete destroy wood?

Wood in direct contact with concrete, and the dampness often found there, will rapidly decay. … However, pressure treating creates only a shell of protection around the wood. Beyond a depth of approximately half an inch, no preservative penetrates.

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.

How long do 4×4 fence posts last?

15 to 20 yearsFence posts, like your fence, should last for 15 to 20 years if properly installed and maintained.

How do you keep a 4×4 from rotting?

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.

How deep do you bury a 4×4 post?

Dig post hole so diameter of the hole is 3 times the width of the post (i.e., the hole for a 4” wood post should be about 12 inches wide). The depth of the hole should be 1/3-1/2 the post height above ground (i.e., a 6-foot tall fence would require a hole depth of at least 2 feet).

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.

What should I put between wood and concrete?

Anyplace where wood meets the ground or concrete, the lumber must be pressure treated. For additional moisture protection, a gasket or strip of closed-cell foam can be installed between the concrete foundation and the sill plate.

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

But young pressure-treated decks, many less than 10 years old, are being shoveled into landfills. Click to see full answer. Accordingly, 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.

Will wooden 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. … The concrete at the top should be sloped away from the post to grade level to avoid water pooling around the base.

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.

Is 1 ft deep enough for fence post?

You should always bury one-third of your fence post underground. … This means that unless you are building a 2-foot fence, which is unlikely in any garden, a 1-foot hole will not be deep enough to support your post. For main and gateposts, you should dig the holes an additional 6 inches deep.

How long will wooden posts last in concrete?

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.

Should I build my fence on the property line?

Your jurisdiction may have laws about how far back a fence needs to be set on your property, which is typically 2, 4, 6 or 8 inches from the property line. … You’re more likely to be permitted to build right on the property line in a densely populated area, but it varies.

How do you keep fence posts from rotting in concrete?

If you don’t allow the concrete to wick moisture out to its surrounding dirt, it will rot your posts quick. I think the best way to do posts is to use just gravel, no concrete. Tamp every 6 inches and you could get it as solid as concrete and this would keep you posts as dry as possible.

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

40 yearsTherefore, if you are in the look for proper construction materials for your home, then consider investing in pressure treated wood. According 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.

Should you 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.

Does staining a fence make it last longer?

Stain, Stain, Stain! An exterior decking stain will bring out the natural color and grain of the wood and will seal and protect from moisture and sunlight. Stain will also make your fence last significantly longer. … Plan on re-staining your fence every three to five years for optimal protection and beauty.