The trademark low-pitched roof of a lean-to conservatory is extremely useful for fitting a solid roof as it can be completed in just a few hours. You simply cannot compare a traditional roofing system to a solid roof, as the latter outperforms it in every respect. So that the solid roof has no adverse effect on the amount of natural sunlight that finds its way into the structure, make sure that you also install Spotlights and double glazed Velux windows into the roof.