Roofs are complex structures with many parts. The appearance of your roof may be important, but its protection from the elements is determined by the quality of the materials and the installation. Each layer of your roof must be installed correctly and placed correctly to prevent water from leaking underneath.
Roof Structure and Layers
The roof structure serves several functions, including providing a barrier against the elements, protecting the house from fires, and offering stability to the roofing system.
Sheathing
Also known as decking, this is the base on which all subsequent layers of the roof are placed. Roof sheathing can be made of plywood or OSB. The boards and sheets are secured to the rafters to form the innermost covering layer. Sheathing provides rigidity to a roof frame and a surface on which nails and other fasteners can be used during shingle installations.
The first layer of waterproofing is placed between the sheathing and the shingles. Underlayment protects the roof against damaging elements such as snow, ice, and rain. Underlayment, also known as membrane, is required to provide the roof with a barrier that will keep it waterproof. For residential applications, underlayment such as felt, tarpaper or another type is needed. Some homes have an extra layer of ice-and-water shield.
Ice & Water Shield
This layer is designed to shield the roof in areas where water tends to collect and causes the most damage. This includes valleys, eaves, and skylights as well as the area around chimneys. Ice … READ MORE