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Deck 6: Installing Deck Posts & Beams



Materials List
4" x 4" Posts
4" x 6" Girders
Brace boards
Wood stakes
Post cap brackets
Angle brackets
Lag bolts
Washers
Screws
Silicone Caulk
Tools List (click item to shop)
Miter saw
Circular saw
Square
Level
Screw gun
Plumb bob
Reciprocating saw
Tape measure
Deckorators
Decorative Balusters
Easy2 Home Improvement
Deck 4: Installing the Deck Ledger Tutorial
Deck 1: Deck Planning
Easy2DIY
Deck 2: Deck Structural Design
Deck 3: Deck Marking & Layout
Deck 5: Deck Post Holes & Foundations
Deck 7: Installing Deck Joists
Deck 8: Installing Deck Boards
Deck 9: Installing Deck Stairs
Deck 10: Installing the Deck Railing

IMPORTANT: Read this before you start


Introduction
In this sixth part in the series on building your deck, you will be installing the structure that will support the joists and flooring of your deck. It is critical that these parts are sturdy and solid. Before you begin framing your deck, you should have the ledger installed along the house and the concrete pads poured and dried thoroughly. These create the various supporting elements for your deck. Next to the house, the deck joists will be attached directly to the ledger. Meanwhile, the concrete pads hold up the posts, which support the girders (or beams) that the support the deck joists opposite of the ledger.

Skill Level & Time To Complete
Time to complete this project depends on the size of the deck and the level of help available, the times listed here are for two people on a 10’x 30’ deck with the house defining two sides of the deck.
• Beginner - 2 to 3 days
• Intermediate - 1 to 2 days
• Advanced - about 1 day

1. Refer to your deck plans and determine the height of each post. Add at least 6" to the length of each and mark the appropriate dimension on each post. Cut the posts at the marks using a miter saw or circular saw.
2. Place the posts in the piers on top of the appropriate concrete pad. Using pieces of 1" or 2" thick wood, put 2 braces on each post at 90 degrees from each other. Drive a stake into the ground and screw the tail of the brace to the stake. Then use a level to make sure the post is perfectly plumb and screw the two braces to each post. Make sure the braces are below the area where you will be installing the deck beam.
3. Screw each post to its pier using a screw gun.
4. With the posts now in position, you need to determine the position of the top of the joists on each post. To do this, take a long straight 2" x 4" and rest it on the top of the ledger. Place a level on top of the 2" x 4". Hold the board level and then lower the board ½" for every 6' of distance between the ledger and the post. This is to provide a slight slope for water runoff away from the house. Mark the post at the bottom of the 2" x 4" board.
5. From the mark on each post, measure down the height of a joist and the height of the beam. Then use a square to mark all 4 sides of the post. This will be your cut line.
6. Cut each post to its marked height. Use a reciprocating saw and cut squarely across the lower mark on each post.
7. Install the post cap brackets on top of each post. Use the appropriates screw or lag bolts to securely anchor the brackets in place.
8. Measure and cut to length girders to length. Eyeball each girder to determine which way it crowns. Place each girder in position on top of the posts with the crown of the girder directed upwards. Screw the girders into place through the post cap brackets with screws and a screw gun.



 
 
 

 

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