One way of preventing condensed moisture from dropping from a glass roof would be to fix small gutters to the sides of the bars, as shown by the sections A (Figs. 1 and 2), and mitre them to a similar gutter running along the bottom rail of the skylight, as shown at A (Fig. 3). To allow the moisture to escape into the gutter D, a hole B to C (Fig. 3) having an outlet in the throating at C should be bored between every two bars. By having the rebate of each alternate bar about 1/8 in. deeper, the glass could be glazed a little sloping as indicated at Figs. 1 and 2; this would cause the moisture to flow to one side, and the small gutters A need only be fixed to each bar having the deeper rebate, as is made quite clear by Fig. 2.

Fig. I.

Fig. 2.

Preventing Moisture Dropping from Glass Roof.