  Let $N_{g}$ denote a closed nonorientable surface of genus $g$. For $g \geq
2$ the mapping class group $\mathcal{M}(N_{g})$ is generated by Dehn twists and
one crosscap slide ($Y$-homeomorphism) or by Dehn twists and a crosscap
transposition. Margalit and Schleimer observed that Dehn twists have nontrivial
roots. We give necessary and sufficient conditions for the existence of a root
of a crosscap slide and a crosscap transposition.

Geometric Topology