There will be certain times when the composting pile or windrows do not need to be covered. This applies to cases where the moisture lost in compost pile needs to be replaced, and often times the replacement will come from the rain. There are certain benefits of this, like the reduced labour necessary to maintain the desired moisture content of the compost pile and at the same time prolonging the service life of the composting cover because of the reduced exposure to the elements which can harm its durability. Actually, all types of tarps like hay tarps and others will have durability issues if left exposed to the elements for a long time.
In addition, it should be remembered that although composting covers are excellent for preventing moisture loss, some moisture will still be able to escape in the form of water vapour. As such, the covered compost pile or windrow should have sufficient water initially. The initial water content should be monitored regularly and be replenished when needed, especially during the active composting stages.
Some composting covers also have a smooth side and a rough one like some tarps used a poultry curtains. In many cases, it is recommended that the smooth side should be placed facing down or in contact with the compost pile. By doing so, it helps to prevent the compost particles like wood fibers and others from sticking to the compost cover. The rougher or more fibrous side of the compost covers has a sort of like Velcro effect which attracts compost particles and cause them to stick.