The roots are probably too deep to be affected by warmth from the pavers, however, the bigger issue with pavers is that they could prevent water from reaching all the roots effectively. We would recommend using a porous covering, such as landscaping fabric or a 2-inch layer of bark mulch (or both). This will help to prevent weeds, but also allow water to reach the roots. Mulches will also help to hold moisture in the soil in times of drought.
The roots are probably too deep to be affected by warmth from the pavers, however, the bigger issue with pavers is that they could prevent water from reaching all the roots effectively. We would recommend using a porous covering, such as landscaping fabric or a 2-inch layer of bark mulch (or both). This will help to prevent weeds, but also allow water to reach the roots. Mulches will also help to hold moisture in the soil in times of drought.