It is not essential for a compost heap to have a lid. However, a lid does help to regulate both the temperature and the moisture levels. You could easily use a piece of old carpet (preferably Hessian backed rather than foam backed) or a thick piece of plastic tarpaulin weighed down with stones.

Does a compost bin need to be covered?

In most cases, a compost pile does not need a cover. ... A cover can limit airflow and water, interfering with the composting process. You should definitely cover finished compost. Otherwise, if it's exposed to the elements, the compost will break down further and lose nutrients as they leach into the surrounding soil.

What do I put at the bottom of my compost bin?

Greens are grasses, fresh leaves and weeds, and vegetable and fruit kitchen scraps. Almost everyone advises putting down a layer of coarse material — corn cobs and husks, sticks, thick fibrous stalks from vegetables or tall flowers. This layer improves aeration at the bottom of the compost pile.