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All roofs have a "pitch" even flat roofs have a pitch required to allow water to drain from the roof.
Southeast
Southeast
Southeast
this normally has to do with snowfall in the area and not how hilly it is. areas with high precepitation in the winter have sloping roofs so that snow will not accumulate and put excess pressure on the roof and cause a collapse.
This is triangular in shape or peak that is created on the side. Because of its shape, it allows leaves, rain to fall from the roof away from the house. Gabled roofs differ in pitch and steep which serves the purpose of protecting the roof from the effects of water.
It has to do with the amount of snowfall expected. Generally speaking, slanted roofs shed moisture such as snow and rain much better than a flat or less steep roof. Steep roofs in the Southwest would be more for looks than necessity because of the unlikelihood of significant amounts of snow each year.
Partly depends on climate. A steep roof is good in a snowy area, it encourages snow to slide off. In many hot areas of the Middle East, flat roofs are popular. The type of construction material may also have influence.
It depends on the materials used and the amount of snow. There are many examples of flat and low pitched roofs holding snow, but a steep pitched one seems like a better choice. On a steep roof, the snow has a better chance of sliding off.
Valley Tin is used on roofs where two roofs section meet perpendicular forming a valley. This creates a transitional for water to drain from both sides of the valley roofs. Two types of Valley Tin can be used, smooth/rolled metal or metal with an inverted V in the center. The inverted V serves to check the water speed on steep roofs to prevent an overshot of water causing a leak in the adjoining roof. Three metals are common in fabricating valley tins. Aluminum, Galvanized Metal & Copper
a steep angle
No they are not steep