To keep extra long pieces steady add an auxiliary fence.
How to attach two sheets of plywood.
Ways to connect plywood.
According to the size of the wall you will have to cut the plywood to fit.
A butt block joint is made by edge gluing two pieces of plywood together and adding a backer block to one side of the seam.
This is considered the simplest method to connect the woods and the appearance is not highly important.
A wooden butt block joint provides a simple way to attach two adjoining pieces of plywood together.
Connections between two pieces of plywood vary depending on the purpose.
If your exterior plywood sheets are 4 feet wide for example a 10 foot wide wall will need 2 1 2 sheets.
You can make splines from plywood or solid stock.
Next glue or nail the plank onto the surfaces of the wood pieces.
Maybe explain a little more what the purpose is.
Next plane and saw the spline blank stock to match the width and combined depth of the grooves.
Two pieces that meet at a right angle will use one type of joint and those that join end to end.
Well it depends on how you want to glue them and where you want to glue them.
The starting point of the project is to line your plywood sheets against your wall to know how much you will need.
Step 2 line the plywood sheets against your wall.
Plywood or metal strap.
The width of the butt block should be a minimum of 16 times the thickness of the plywood you are using.
Using a backer block to stop tear out cut kerfs on the ends to form a groove as wide as one third the thickness of your stock.
First gather up some heavy objects say cinder blocks.
If you want to bond them together to make a single sheet of 8ftx2ft x 1 1 5 inch thick plywood you need to do this.
You say it will be on the ground so you should use pressure treated and pl premium or titebond 3 glue.
I think frank has the solution four sheets of 3 8 plywood two running opposite to the other two.