So the extensions need to be flush so plates and other things protuding cannot be sticking out of the sides.
Extending deck posts for roof.
Where local building codes allow this practice you can bolt a patio overhead s posts directly to existing deck beams joists or other heavy structural members.
I am looking to extend my 4x4 corner posts on a deck to build a pergola over top of the deck.
Porch decks require 25 additional psf for roof loads for a total of 80 psf.
The footings for porch decks must be larger than deck footings.
As a result most decks have inadequate footings to support a new porch roof.
Before you begin make sure you re matching the house roof pitch angle and overhang for your roof.
One of our readers rune eriksen sent us photos of his design for a home built deck drainage system and we were impressed enough to check it out.
Or you can lag screw through post bases and decking into the top of a deck joist or beam.
Maybe you forgot to measure twice and cut once.
Or you re down to the last post and it s not tall enough.
His low cost easy to build system catches the water that drips through the deck boards and redirects it to the outside of the deck.
Building on an existing deck.
Install post base connectors.
Your deck space isn t limited by the current height of the posts.
Tie your existing deck posts into the roof by extending your corner posts with the 4 by 4 lumber.
Perhaps you trimmed damage from one end of a post.
Typical decks are designed to support 55 psf lbs per square foot.
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Make the front of the roof the height of the house roof you are presumably tying into with the rear sloping at a rate of six inches over two feet.
These are used to attach the support posts to the frame of the deck.
You can extend the length of the deck posts for added privacy or added decorative impact.
Take a look at our step by step guide for building a shed roof over your existing deck.
How to make a deck post taller.