"Walter R." wrote in message
...
The patio is 11x40'. It has some small cracks in them that have served as
"control joints". To avoid further cracks, I thought it might be wise to
cut a few more control joints where it can break with ease. The whole
patio will be covered with a layer of split paver bricks, laid over heave
roofing felt.

Out typical spec is:

1. SAWCUT CONTROL JOINTS , 2" DEPTH, EVERY 100 SF OF PAVING MAX
2. SQUARE PATTERN SAWCUT JOINTS, 1" DEPTH, APPROX. EVERY 5'x5' GRID

So for your patio you'd have two control joints at 5.5' and 20'.

Greg M