Within the lineup of Rowlinson Elite Sheds lies the 12mm shiplap siding coupled with a complete tongue and groove foundation. The Top consists of 2 sturdy boards enveloped with a mineral roofing felt. Adorned with a dipped amber finish, this shed requires an annual application of timber preservative to adhere to the 10-year anti-decay commitment. Kindly be advised: The windows are in a fixed position.