Plywood i have used is only about 12mm and i would not use that.
Lining attic with plywood.
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The solid base.
Not many cudboards are made out of plywood we do do solid timber but that cost heaps some people just want an original cudboard and pay 10 20k.
It must not be used in exposed damp or wet conditions as the bonds are not durable under full exposure to weather conditions or wet or damp environments.
This will add a much more stable platform to your attic flooring and can act as a subfloor if you decide to finish off the attic in the future.
What about ventilation behind the ply lining 100mm of kingspan with 100mm timber not a good idea.
Osb oriented strand board.
Use 50mm kingspan and 50mm timber spaces blocks to hold the insulation of the blockwork also cut back framework with 50mm steps to ensure ventilation length and height of wall.
The subfloor installation is easy.
The sheets are generally 4 x 8 or 4 x 12 feet in size.
The plywood will create a smooth strong ceiling without having to apply drywall tape and mud to the ceiling.
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Run the plywood down to the top of the knee wall.
How to lay attic flooring on top of fiberglass insulation.
I would say they would all flex the same but chipboard would snap easilier wich is why i would not use that.
Precise measurement is the most difficult as you need to consider all underlying obstructions carefully before proceeding with your plans.
A plywood subfloor generally uses 1 2 inch to 3 4 inch thick sheets of plywood that have one rough side which faces down and one smooth side which faces up.
There are also synthetic floorings available from several different manufacturers.
Covering the ceiling joists in the attic using plywood is a cheap way to make better use of the wasted space in your house.
Another way to add attic flooring is to secure plywood sheets to the floor.