Valleys are usually categorized as either open or closed. The easiest way to determine whether you have an open or closed valley is that an open valley has the metal exposed when complete and the closed valley does not. Open valleys with or without metal are generally less expensive and are of inferior quality than closed metal valleys. Closed metal valleys offer a triple layer of protection consisting of your ice protector, metal and shingles. Closed valleys are superior to open valleys because they have only one seam vs. two, therefore, reducing the potential risk of a leak by 50%. They are also superior on multiple angle roofs because the high side will be cut allowing the water to flow over the seam and not splashing onto the lower seam. A good contractor can install both types of valleys however we at Imperial Roofs strongly recommend a closed valley installation on all of our projects even though we incur a higher cost of operations.
A drip edge is a piece of metal which helps guide the water into the leaves. A drip edge is strongly recommended on any slopes below 4/12.
Flashings are metal strips which seal the seams and joints of the roof. They are typically located around the walls joining the roof, around chimneys and skylights. In many cases, the flashings can be cleaned and restored if they are caught early and are made of galvanized metal. If the damage is progressive and extensive they should be replaced. Utilizing our professional expertise we will recommend what is necessary to be done to ensure no leaks will occur, sometimes all you need is to have them properly refastened and the seams re-caulked.
Shingles are your roofs first line of defence against environmental damage. The type of shingles you chose is the biggest factor in determining the longevity of your roof. For example, premium shingles constructed with of fibreglass asphalt saturated mats coated with ceramic granules will provide a longer roof life.
There are many types of shingles available for your roof, therefore, a professional advice is crucial in making your final decision. Different companies call their shingles of equal quality by different names for the same overall product so choose carefully. Most shingles are either of the three in one construction (three tabs) or they are of the laminate variety meaning layered construction and all come with an unlimited lifetime guarantee from the manufacturer.
Fibreglass /Asphalt shingles are only thinner in appearance because the starting mat is thinner than the old style paper based constructed shingles as they have the same amount of asphalt in each product. Fibreglass shingles are warranted the same from the manufacturer. All shingles manufactured now are of fibreglass construction. Laminate shingles also known as architectural shingles are usually of the premium variety with heavy duty construction, they come with a limited lifetime guarantee (meaning 50 years prorated guarantee).