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Question DetailsAsked on 9/29/2014

Cost of 12x12 deck

Treated lumber, attach to existing deck.

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You can find a number of prior similar questions with answers in the Home > Deck and Patio (or something very similar) link in Browse Projects at lower left. All told, using treated timber will be about comparable price to decks with untreated framing but synthetic decking, or a total of perhaps 5% more than plain untreated wood for everything.

Be cautious on the "treated wood" issue - there are different grades and approved uses - check what is allowed in your area, but the ground-contact rated copper-bearing preservative (ACA, CCA, ACCA, ACP, CA-A, CA-B, ACQ, ACZA, MCA, MCQ, Copper Napthenate/Napthelate in different areas and countries and time periods) is what I recommend - is the only treatment (short of creosote orpure arsenic) that I have seen that really works for decades - I have a 30 year old CCA treated deck that is just now ready for a recoat to prevent cracking and the start of deterioration. Note that some of these types of treatment are banned in certain areas (especially California, as usual, where normal human life was outlawed years ago) and for certain uses, and you certainly don't want to use the arsenics or chromate bearing ones for close contact environment with young children - like playpens, play decks, swingsets, etc). Also, based on terrible performance I have seen (insects and fungus and dryrot within months) I stay far away from Wolmanized timber - which is a reddish-brown treated wood commonly found at Lowes and Home Depot, as well as many other home centers and lumber yards, and is usually the cheapest treated product available.

Also, the ground-contact rated ones usually have to have incisions (little slices all over it like death by a thousand cuts) for the treatment to penetrate - this makes it last FARRR longer than that which is merely sprayed or briefly soaked in the material, so I prefer to use ground-contact timber for all supporting members at least, and also for railings and decking if the homeowner finds it more rustic appearance satisfactory.

It is possible to color the retreatment solution (comes in green and brown) to recoat if desired, and once thoroughly dry (commonly comes from the mill pretty wet with treatment solution, especially cheaper brands) will take other stains and good deck paints well, though you are starting with a green or brown treated wood so you are limited to the darker colors.

Answered 6 years ago by LCD

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