Whether you live in a single family dwelling or a multifamily building, your roof is something that you will notice. If it looks good it helps to increase the rest of the structure’s exterior appeal. This is why the residential roofing products are designed with aesthetic appreciation in mind. Residential roofing provides an array of attractive colors and blends as well as the different profiles with the varied materials and products.
Before you settle on the type of roof you want to purchase, some consideration should be given to the roof structure you are about to have covered. What is the pitch (angle) of the roof? How well does the type of roof you want weather on that pitch? How will the immediate environment impact the life of this particular roof type?
This all basically means that the amount of rainfall you could have at any one time can determine the speed at which the water evacuates your roof. The longer the water stays on your roof will determine its weather tightness. A lower sloped roof holds water from running off much longer than a steeper sloped roof. This is obvious of course, but you should know that in heavy rains water builds up while trying to run off, and it begins to move laterally across the roof.
The immediate environment can tell you how quickly the roof will be able to dry off. Is it open to full sunlight or is there a lot of foliage providing shaded areas? Plant growth on the roof or hanging cover over the roof slows the necessary drying time. A moist roof will promote fungus and mold growth, color distortions and the rotting or rusting of the material.
The most popular type of residential roofing products are asphalt shingles. They are affordable and require little or no maintenance. These products cannot be used on roof pitches of 2" in 12" or lower. That is for every 12 inches level that your roof runs back it rises 2 inches at the 12 inch mark.
The facts are that asphalt shingles should not be used on any roof under a 4" in 12" or typically displayed as a 4/12.
The metal roofing panels are not approved to be used below a 2/12 either, but they function very well on that pitch as well as on pitch any above it. The most popular roofing metal panels are called 5V Crimp panels or Standing Seam Panels.
The wood shingle and shake roofing materials as well as roofing slates are approved for use on 5/12 and greater, but they really should not be used on any roof below a 6/12. They typically slow the flow of water off and promote lateral flow by the nature of their texture.
Concrete roofing tiles, clay roofing tiles are approved for use on 4/12 pitches, but to get the best life out of these roofs they should not be used below 6/12's. The design of these products when applied will actually lower the roof pitch by up to 1". Though these roofs rely heavily on their underlayment systems, it is very important to evacuate the water off the roof surface rapidly.