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cobamexico

03:41PM | 03/16/06
Member Since: 03/28/04
20 lifetime posts
Bvlawn
I am building a composite deck over a flagstone patio. The patio is about 2' off the ground and measures 8'x 10'. I am going to take up the flagstone, break up the 3 inch layer of concrete that sits on top of 2 layers of concrete block and put 2 x 4s onto the concrete blocks --- this will allow the decking to set at a height that is then just a short step down out our back door.

It is a 60+ year old patio. I plan to use concrete screws to put the 2x4's into the concrete block. Do you you think it is realistic that the blocks were filled or will I be able to put the concrete screws into the webs that surround open voids in the concrete blocks??

Also, thoughts on clips vs. screws for composite decking?? I would rather go with clips, but did not know if there are major downsides.

Icemancomth

11:30PM | 03/19/06
Member Since: 06/19/04
23 lifetime posts
Are you using pressured treated wood? Because concert absorbs the water which in turns is absorbed into the wood. You will run into problems down the road. I would use a galvanized steel adjustable standoff post base. This anchors wood posts to a concrete floor. 1" standoff helps protect against post and column decay by distancing the wood from moisture on the floor. Base surrounds post on four sides.

You could try using dek-blocks for a floating deck. I used them for my pool. See photos at http://www.hemmingsjones.com/decks/photos.html

Good Luck

Icemancomth

www.hemmingsjones.com/decks

www.dvdhomestudios.com

www.hemmingsjones.com


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