A frame of 'stop' moulding is nailed to the top edge of the top frame. Then a plastic window piece is laid on top, cut to overlap only half the width of the 'stop' moulding. Then 'ply cap' moulding is nailed over this to lock the window piece in place, All these mouldings are mitre-cut at the corners.
Portable Cold Frame This cold frame is made in three stackable layers to make it portable. It can hold nine trays of seedlings, and includes a watering system that can be operated by a timer.
