  We study the percolative properties of random interlacements on the product
of G with the integer line Z, when G is a weighted graph satisfying certain
sub-Gaussian estimates attached to the parameters alpha > 1, measuring the
volume growth on G, and beta between 2 and alpha + 1, measuring the
sub-diffusive nature of the random walk on G. We develop decoupling
inequalities, which are a key tool in showing that the critical level u_* for
the percolation of the vacant set of random interlacements is always finite in
our set-up, and that it is positive when alpha \geq 1 + beta/2. We also obtain
several stretched exponential controls both in the percolative and
non-percolative phases of the model. Even in the case where G = Z^d, d \geq 2,
several of these results are new.
