Roofs With Internal Gutters

Often the outlet to the valley gutter discharged over a small portion of roof before being contained by the eaves gutter figure 7.

Roofs with internal gutters.

Metal lined gutters must have welded cross joints and a strip of roof underlay between the metal and the timber or ply. Breaking down the pros and cons of flat roof drains. Scuppers are simple to install from a. Internal drains some commercial roofs have drains like the drain in a shower.

A drain at the top with a trap to catch debris connects to the internal water system where pipes drain it internally through the building. The common gutter lining is either a hot mop built up roofing a torch down membrane or a pvc tpo single ply. The internal gutter system is made up of a gutter lining material a metal drop scupper and a fascia board that has been installed more than two inches above the roof deck. Internal gutter construction gutter construction varied from a simple shallow trough or v like a valley detail to a tapered valley laid over firred framing to give a fall figures 5 and 6.

External downspouts mounted to collect water flowing from rooftop scuppers. This type is great for larger buildings and those that naturally pool at the center of the building. The built up and torch down roofing will last about as long as the average twenty year steep slope roof and the pvc tpo liners if installed correctly could last as long as the thirty year steep slope roof.