What is the thickest plywood I can buy?
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Go get a piece of 1 1/4 treated deck board (5 1/2 inces wide by 8 ft)and cut to lay at (bridge)across void. If they move around on yea you can go to lumber yard and get some of the steel strapping they trashed and take home place across to tie them together and nail them together. The treated will hold up to rain way better than the ply and cost same .Good luck
3/4
While the length and width of a sheet is pretty straight forward, the thickness dimensions are anything but. The most common sizes of plywood sold in the United States are 3/4", 1/2" and 1/4". However, that's not exactly correct. A 3/4" sheet of plywood is really 23/32" (and is now typically labeled as such). Similarly, 1/2" should be correctly labeled as 15/32" and 1/4" labeled as 7/32". However, everyone still refers to them as 3/4", 1/2" and 1/4".
Although it doesn't seem like much, this 1/32" differential between the actual size and the common size can become an issue when working with plywood. For instance, if a woodworker is building a bookshelf where a 3/4" plywood shelf is placed into a dado cut into the shelf standards, there will be a very noticeable 1/32" gap, and the shelf will feel a bit sloppy in the dado. To combat this, the dado should be cut at 23/32" to ensure a proper fit.
Thickness is no longer TRUE as one other states, though I suspect it's advertised measurements are retained as advertised to not confuse the customers psychie.
Custom ordered I've gotten it as thick as 1 1/8 inch, but WHY bother? Without at all knowing your purpose, certainly as a Laminate already, IT can be laminated ON.
I want very much to believe you at least know what the standard sizes/thicknesses are.
Steven Wolf
I have a piece of 11/8'' right know but it's hard to find and expensive...But for what you are doing, you can buy some gravel to fill it in and if you want get some of that asphalt in a bag to build it up..Or even put some concrete down better than putting plywood down...OK a rental.put the gravel down you can always take it up, but I would get permission from the landlord to put down the concrete. I'm sure he will say yes to any improvements..
I've seen 1", but couldn't tell you where to get it.
First I would ask the landlord the purpose of the indention, sounds like it was intentional so I would wonder if it is there to divert or move water, so you might want to consider not actually blocking the space but bridging the space. Plywood is available in thicknesses in excess of 1" but as another answer says it is expensive, it would be more cost effective to glue two 3/4" pieces together, since you are talking about exterior, you can get pressure treated material. However it doesn't like glue so you have to use mechanical connectors as well as an exterior glue. You might want to consider some sheet steel.
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