In a power-packed first-half performance that brought four tries for the forwards, front-rowers Ronan Kelleher and Peter Cooper crashed over from pick-and-goes before second-row Fineen Wycherley used all his 196cm frame to reach out and plant the ball down under the posts.
Having seen big second-row Theodore Solipo charge over from 30 metres, Samoa appeared to be building momentum as the half came to a close, but Ireland took advantage of Howard Tagoaiās yellow card for not retreating 10 to score on the stroke of half-time through Oisin Dowling.