  Let $k$ be a field, let $A$ and $B$ be polynomial rings over $k$, and let $S=
A \otimes_k B$. Let $I \subseteq A$ and $J \subseteq B$ be monomial ideals. We
establish a binomial expansion for rational powers of $I+J \subseteq S$ in
terms of those of $I$ and $J$. Particularly, for a positive rational number
$u$, we prove that $(I+J)_u = \sum_{0 \le \omega \le u, \ \omega \in
\mathbb{Q}} I_\omega J_{u-\omega},$ and that the sum on the right hand side is
a finite sum. This finite sum can be made more precise using jumping numbers of
rational powers of $I$ and $J$. We further give sufficient conditions for this
formula to hold for the integral closures of powers of $I+J$ in terms of those
of $I$ and $J$. Under these conditions, we provide explicit formulas for the
depth and regularity of $\overline{(I+J)^k}$ in terms of those of powers of $I$
and $J$.
