today's options for attaching posts to deck surfaces the idea of quickly installing a post where you want, on either a wood framed deck, concrete or even stone surface is appealing. with the right post anchors or hardware you can get some impressive aesthetic results and greatly reduce the potential for rot.
most local codes call for a railing that is either 36 or 42 inches tall, but check with your building department. the post will be the desired height of the railing, and the width of the framing it is attached to, minus the thickness of the cap that rests on top of the posts if any .
on a simple rectangular design, this requires that you double the number of footings and attach a beam on each row of posts. combine attached and freestanding deck areas. by setting a substantial part of a deck so it is separated clearly from the house, the transition from house to yard becomes more graceful.
one of the key design factors is knowing how to calculate the post size that you will need to use to support the weight of your deck and the weight of the roof covering the deck. deck design software
generally speaking this diy project can be done in more ways, according to the type of the deck material: if we speak of a wooden deck, then the posts have to be attached on the deck frame by using long lag screws and shims to make sure the post is plumb; on the other hand if we speak of a concrete surface we have to install post anchors before installing it.
otherwise, based on these tables for douglas fir or southern pine posts and a combined live and dead load of 50 psf , a 4-foot-tall 4x4 post could carry a maximum tributary area of 256 square feet, but a 4x4 thats 10 feet tall the maximum allowed height could carry only 36 square feet.
and if a deck is over 10 feet tall, you should install bracing. this article shows installing non-notched posts on top of concrete footings that rise above the ground, to support framing that has already been built on temporary supports.
tall post attached to deck how to build a deck: post holes and deck framing - lowe's a safe, long-lasting deck needs proper footings and solid framing. pouring the post footers; setting the posts; attaching the beams; building the floor frame; working with . once the posts are set, you'll cut them to the correct height.
deck railing connection tips never notch deck posts through bolts not lag bolts to deck joists use special galvanized hardware - see below watch video below for great connectors click here to get tim's free and funny newsletter deck post danger deck railing posts are the foundation of a deck railing system. they must be strong.
notch the cedar 2×4 posts a and b and cut them to length fig. a . be sure to cut the 30-degree miter or match an existing angle at the bottom of each post. notch both the tall and short pieces to fit over the deck edge.
view of the new 6×6 deck post after fastening it with screws to the standoff post base. the deck was raised higher than the 6×6 post and is supported by the temporary support post i built with 2x6s and 2x4s:
or you're down to the last post and it's not tall enough. perhaps you trimmed damage from one end of a post. whatever the reason, if you come up short on the required length for a deck post, you
4x4 post 12 min. width, 6x6 post 14 min. width , a two level deck or deck with roof for posts over 10'0 tall, recommend cross bracing. 5. beams: top of the beam see table 1 or set on a 2x2 ledger attached to the band board.
building codes often require decks with posts taller than 6 feet to have lateral bracing. your local code will dictate if deck posts must be braced. most bracing can be made with 2x4s; but for braces more than 8 feet long, use 2x6s.
in those instances, the post should be attached to the joists, not the rim, because the rim is not usually fastened to the joists in a manner capable of transferring the load. rims are typically nailed into the ends of the joists, the weakest possible connection for withdal resistance. theres more to consider than just the post-to-deck connection.
there are several methods for setting posts. one way is to pour concrete in the post hole, set the post on the concrete and backfill with gravel. to help prevent rotting, this deck will have wooden posts attached to concrete footers above ground. for either method, set the footers below the frost line
perhaps you trimmed damage from one end of a post. whatever the reason, if you come up short on the required length for a deck post, you can lengthen it in a variety of ways. before you start work building or remodeling a deck, check local building codes and make sure to follow them.