I am building a 8x12 playhouse and am planning to install 3/4" plywood
subfloor. I am following a book for plans & directions. Now, I would
have installed the 3 8x4 plywood sheets one next to the other (8ft
dimension of plywood aligning to the 8ft side of shed) to cover the
However the book suggests to cut one of the sheets into half (4x4) and
then use one 4x4 and then an 8x4 (8 ft dimension of plywood aligning
with the 12 ft side of shed) on one side, and reverse on the other (ie.
first the 8x4 and then 4x4).
I am sure there is a good reason for it, but it does not say why.
Could someone explain?
Also, what kind of tolerances are "acceptable" when building something
like this? That is, if the size of floor or walls is within 1/8" inch
it is OK or 1/4" inch etc. Is there any particular dimension that
needs to be more exact (e.g. height of walls has to be more exact than
size of floor)?