Usually, average roof pitch is determined using the same roof length method; commonly, it is 3/4 th of span, as per gothic rafter must be equal to span. greek says one must keep rafter length in range of 1/9 to 1/7 th of span, but as per roman style, the standard dimensions are kept about 1/3 to 2/9 th of span with an angle of 23 to 24 degree.. The reason for a pitched roof is to cause rain to run off the roof surface. a flat roof is more likely to allow rain to pool and this can cause damage, especially if the roof is made of a porous substance like wood. in the case of a shed roof, a layer of roofing felt usually offsets the porosity of the wood.. A roll of mineral roof felt comes with the standard garden shed; however, these are generally on the low end of quality with a short life expectancy�3 to 5 years, and tend to be fragile. any amount of damage to the shed roofing may allow water in and damage the shed�s structure..
A roof pitch is the angle the roof falls from the ridge to the gutter. the shed company offer gable roof pitches of 10
