My neighbor had his "carpenter" son do this last spring.(April-ish) 2x6 PT over existing 2x6 PT. He shot 4 ringshank nails through the face on every joist (16" oc). Damn planks were curling up by August. :no:
Here's what I have. The orginal deck was over 15 years old very sound 2x4 PT. A deck that was built over that the orginal us cedar 2x6 nailed with 12Galv into joist, but a 1/2" furring strip was installed between deck surfaces. I removed cedar and strips installed new strips and install XLM hidden fasteners. I belive this will last as long as the cedar did or longer. I don't see why not.
In a perfect world with out working for for any landscaping General Contractors and knowing that a deck was hiding under those 2x6 cedar boards. I would have included the removal in my original agreement. But this world is far from perfect. Once we discovered the mystery deck it would have been hard for me to sell the idea of me charging the landscaping General Contractor who would have to pass that on to the owner an additional cost for something that had not been a problem for over 15 years. Maybe it was the 1/2" furring sleepers that separated the two surfaces, and allowed for good damage that saved this deck from disaster. But in any case I thought it would have been useless to attempt to bill anyone for the removal. Just didn't feel that was the hill I wanted to die on. I did manage to submit a bill for installing new furring / sleeper strips and longer screws for decking.
Except for a couple of misinformed issues. Most of the time the info I get from this site is RIGHT ON RIGHT and after all, I do have an advanage. I'm the only one here that had the privilege of visiting the site to access.
Don't be so quick to to condemn maybe an Innocent man. (The world is not flat)C. Columbus
When doing work properly the number of issues that can pop up and cause us grief is high. Now add to that a condition that the manufacturer does not recomend and you have the makings of a potential Monster headache. That being said this installation may be fine, may give them many years of good service, and they saved on demo and carting, who knows, GMOD.
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