“Why is there condensation inside my skylight?”– Whether your skylight is glass or acrylic no doubt it is insulated. Insulating a skylight is achieved by having two panes of glass or a double walled acrylic dome. With insulated glass argon fills the dead air space because it’s a better insulator than air itself. In the case of a glass skylight the seal may deteriorate and the argon gas escapes allowing air and moisture in between the glass. As the air warms and cools condensation forms. Even though acrylic skylights do not have argon, the same principle occurs with the formation of condensation. Being less durable than glass many times an acrylic skylight will crack allowing for transmission of air and moisture. When this occurs the skylight needs to be replaced.