Very bad idea! The vinyl will compress but it is not flat and will not
compress uniformly and probably not completely. I would definitely cut it
and install J channel after sliding a piece of flashing behind the vinyl.
Dwayne
You may want to consider a free standing deck if the support posts aren't
too high. If not, flash the interface well so water won't penetrate. I
had to replace 28' of perimeter band on my house with pressure treated
lumber after moisture rot took it out.
If you bolt it to the house, use standoffs so that there is a 1" air gap
between the house and deck. You can periodically wash this area with a
hose to remove leaves and debri. Otherwise, contact can
induce moisture rotting problems.