How To Build Deck Extension

Before widening or lengthening your deck it s vital to ensure that the original deck is structurally sound. The sistered joists are nailed into the sides of the existing joists and extend past the beam at least 6. Check the framing for any signs of rotting cracking or other degradation.

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Many people like to add new levels to the deck connected by stairs.

How to build deck extension. Build the frame and toenail it to the old deck. Design your extension to use 2x6s if possible. That way you ll have about a 7 inch step to the new deck. To begin installation start by squaring up the first piece of composite to the deck and attaching it to the underlying joists with composite decking screws image 1.

Continue screwing down the decking making sure to allow for a 1 4 gap between each plank. Some deck builders choose to sister the new joists back over the existing beam and install a new beam in front of the existing deck. This home improvement project builds on the existing structure to create the ideal outdoor living space. This latter method is best when you re worried that the new decking material won t match the old and if the old deck is weathered at all it likely won t.

Also inspect the posts. By putting the new deck on a different level it makes the transition less jarring and unsightly. You ll be faced with unique challenges on this project including building permit applications design and removal issues. Use a builder s square to mark the ends at a 45 degree angle and cut them neatly with a circular saw or handsaw.

Having attached all the joists finish up the deck by installing the decking material. If the deck is attached to the house not freestanding make sure the ledger board is properly secured to the side of the house. Screw each deck board down with two screws into every joist. To frame an extension that rises one step from the existing deck lay out the post locations and cut the posts so the joists rest on the surface of the old deck.

If they lay diagonally you ll need to clamp each one onto a workbench. When your existing deck isn t providing the space or comfort your family needs it s time to start planning a deck extension or deck renovation. When they re all screwed down you can saw the edges in line with the sub frame.