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As Saige composite decking installer you can use 4x2 treated joists as with all wood will rot eventually, if you i would put down mot type 1 wack it down. to the whole frame before fitting the deck boards it can be applied by garden sprayer as the frame is the structural part of the decking well worth the extra 

Whether you are planning to install a composite or timber deck, the products you select for the construction of your deck's substructure are vital. If you are building your deck substructure yourself, you have probably already considered to the various materials available for a solid, lasting deck foundation. But even if you are 

Picture framing decking is becoming quite popular among home owners and deck builders. It really sets even the most basic backyard deck apart from the rest and with minimal to zero material cost increase and only a bit more labor. There are two common styles; a 45 degree miter frame corner or a butt joint frame.

Once all the posts are secured you can install the decking. For a cleaner look, use hidden deck clips and grooved composite boards. If you deck will have parting boards running down the middle, install decking on either side of the bracing you installed to support them. You'll trim the decking before installing the parting 

Composite Decks are usually built with 2×10 and include joist flashings to extend the life of the frame to the 40 year mark. Wood deck beams are typically smaller vs a larger composite deck beam. It is always a good idea to add another flashed layer to the beam to extend the life of your retrofit deck! Wood