[[FAQS and GUIDES]]

====Factors Affecting Roofs====

    *  Sun delivers a combination of ultraviolet rays and heat can prematurely age a roof.

    * Snow or ice that melts and refreezes (called ice damming) pushes up the roofing material and causes leaks. Ice damming can be a temporary problem that ends when the thaw is complete. Excessive amounts can damage the roof and roof structure.

    * Rain is normally kept at bay by a roof. But when rain or moisture gets underneath roofing, damage can occur.

    * Wind can remove any roof in the most extreme occurrence. However even minimal amounts can weaken a poorly installed roof by letting dirt and moisture get underneath.

    * Moisture from condensation underneath a roof not only harms the roof and sheathing, but also can cause problems inside of the house.

    * Trees provide shade to help cool a house. They also provide leaves and limbs that can fall or scrub against the roof.

    * Algae and moss get a foothold on moist surfaces. Excessive growth can retain moisture and cause eventual weakening of the roofing material.


- http://www.lowes.com/lowes/lkn?action=howTo&p=BuyGuide/Roofing.html -