There is a difference between 'maximum size' - 'practically available
maximum size' and 'practical to use maximum size'.
It is readily available in rolls large enough to do your house without
leaking, and with a minimum of planning.
I've never used the stuff on a roof. [my pond is lined with it,
though] It glues readily, and takes a crap-load of abuse. . . .
and is heavier than all get out. I would think that a roll a foot
wider than one flat on your roof should be plenty heavy to manhandle
on a roof.
Can any roofers expound on my *theory*.
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