What size deck posts should I use?

As a general rule, if the support posts are spaced no more than 10 feet on center, all you will need to use are 4- by 4-inch posts. Most local building codes permit 4-by-4 posts 10 feet on center for all but multistory decks..

Subsequently, one may also ask, what size posts do I need for a deck?

Given that most decks are less than 12 feet tall or so, 6x6 posts can support the loads from nearly any typical deck framed with standard dimensional lumber, as the maximum spans of the joists and beams limit the area and the load any single post must support.

Furthermore, can I use 4x4 posts for my deck? In the past, many decks were built with 4x4 support posts (also called structural posts). But these can bow seriously, even if a deck is only 3 feet off the ground. For that reason, we strongly recommend that you use 6x6s instead, even if your building department does not demand them.

People also ask, what size bolts to use for deck posts?

At connections carrying structural loads, such as deck ledgers or railing posts, use through-bolts or lag screws. Through-bolts are stronger and should be used where possible. For the heaviest connections on a deck, such as where ledgers attach to the house or to posts, use 1/2-inch bolts or lags.

How many posts do I need for a 12x16 deck?

A standard deck will need four footings parallel to the house, but they will need to be temporarily braced by 6 inch-by-6 inch posts.

Why deck posts should not be set in concrete?

A deck post should always be placed on top of footing, not inside concrete because it can break. When concrete is poured around a deck post in this way, the post will rot due to moisture buildup by the soil.

Do deck posts need to be cemented?

There are several ways to set deck posts; we recommend attaching the posts to concrete footers above the ground. This helps to prevent wooden posts from rotting. Set footers a minimum of 6” below the frost line for your area to prevent movement during freezing temperatures.

How deep should a post hole be for a deck?

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). Add about 6 inches of QUIKRETE All-Purpose Gravel into the bottom of the hole.

How many posts are needed for a 10x10 deck?

four

What kind of bolts should I use for pressure treated wood?

Hot-dip galvanized or stainless steel fasteners, anchors and hardware are recommended by the Preservative Treated Wood Industry for use with treated wood.

Can I use 2x6 joists for a deck?

2x6 joists should only be used on ground-level decks that do not require, and will not provide for, any guards. Most decks use 16" on center spacing for joists. Most decking is not strong enough to support longer spans than 16".

How do you fasten deck railing posts?

After the decking is finished, it will be time to install the top and bottom rails, balusters, top cap and any other parts.

1. Mark rail post centers.
2. Mark for the exact position.
3. Cut the post and tack a guide nail.
4. Plumb and clamp the post.
5. Drill holes for the bolts.
6. Pound the bolts through.

How long should ledger bolts be?

Typically, you will need to install your bolts alternating high and low 2" from the top and bottom of the ledger board. As a rule of thumb, bolts can be spaced 16" on center for supporting joist span up to 12' in length.

Can I use galvanized bolts in pressure treated lumber?

Mechanically galvanized screws are generally suitable for decks and other outdoor projects made of pressure-treated lumber. Nevertheless, you should not use them with PT lumber in contact with the soil, in high-moisture areas, or in areas with salt content in the air.

How far apart should 4x4 posts be on a deck?

Starting with your perimeter, mark the location of each deck post to locate the fitting position. In general, posts should be spaced no more than 8 feet apart. Some builders position them every 4 feet for a completely rigid frame. The maximum distance between footings is determined by the size of your joist material.

How much weight will a 4x4 post hold?

about 420 pounds

Can deck posts be buried?

The Buried Post Footing. This footing method involves pouring a concrete pad at least 12” thick at the base of your hole. The pressure treatment companies insist that these posts will last longer in the ground than the deck frame that is built above it, and this practice is accepted by the IRC code.

Can deck posts be set in concrete?

Setting your post in concrete as you would a fence post will work just fine, as long as you use Sono tubes or The Post Collar. You want no earth to wood contact! Or use pier blocks.

How deep should decking posts be?

The post holes need to be 700mm deep and the decking posts are 100mm*100mm treated timber. The deck post holes need marking out. This can be difficult and can be made easier if you use some of the joists and put them into position.

Which is stronger 2x6 or 4x4?

The single 2x6 is 68% stronger than the 4x4 for vertical loads as you describe. However, I caution you that it may be a good idea to have someone design this beam properly so the job is done right. If you're willing to have a 4" wide beam, why not create a double 2x6 beam, this will be 237% stronger!

How do you attach support to a deck?

How to Reinforce My Wooden Deck

1. Measure and cut a 4-by-4 beam to the height of the deck at the point where the deck sags.
2. Dig two holes in front of and behind the location of the jack.
3. Dig a hole 2-foot deep and 1-foot wide centered between existing columns along the exterior of the deck.

How strong is a 6x6 post?

As this screencap from it will tell you, a 6x6 post can support 20,000 even when 12' high—if cross-braced and secured properly.