Ft sbs self adhering cap sheet roll for low slope roofing in slate.
Low slope roof gutter.
The goal will be to move the structural low point to the drain line.
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As a general rule gutter slope is set at 1 4 inch per 10 feet of guttering.
Sure sometimes the gutters fill up with leaves and other debris but the gutters hang outside the building walls so in the worst case we get some water stains on the outside walls or drown our landscaping.
This means the downspout end of the gutter should be set 3 4 of an inch lower than the other end.
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The plans call for the drains to be installed 2 feet up slope and thus they will be more than 1 2 inch above the low point.
With a structural slope to meet the thermal value we are looking at two layers of 2 6 inch insulation.
For example if you have 30 feet of guttering the calculation is 1 4 x 3 0 75 i e.
However when we deal with low slope roofs where roof pitch ranges from negligible to perhaps half an inch to the foot 4 things change.
Gaf liberty 3 ft.