The smallest width of polycarbonate sheeting we stock here at ERoofing are 4mm polycarbonate sheets. Despite their size, they is extremely strong and resistant to water, making them very versatile.
4mm polycarbonate sheets are perfect, for instance, for cloches and greenhouses. A cloche is an odd, portable structure which is basically a cross between a diving bell and a greenhouse. The result is a mini-greenhouse that can be put over an individual plant or an individual patch of plants to provide the same benefit as a greenhouse.
4mm sheets can also be cut with a knife which makes them excellent for tasks like replacing broken glass in interior settings. The high level of insulation relative to size and weight also makes 4mm sheeting good for permanent interior glazing.