Are you thinking about installing a metal roof? As the benefits of a metal roof have become more evident, not surprisingly, they have become much more popular among homeowners.
Not just does a metal roof last longer and often withstand harsh weather more effectively than a traditional asphalt shingle roof, with the many choices in panel colors and styles, they are now a very attractive choice. Often they significantly add value to a home.
However, like any other roofing system, a metal roof does have its drawbacks. One big drawback is expansion and contraction of the roof. While in the past, metal roofs were used primarily for non-insulated or habitable structures, such as sheds and garages, there was little temperature differential between the inside and outside temperature of the structure. With a home, this is not the case, and metal roofs can expand and contract as much as two inches due to what is called thermal movement. And while different metals expand at different rates, any roof expansion and contraction predisposes a roof to leaks down the road.
So what is the best way to manage the expansion and contraction of a metal roof?
Whatever roof fasteners you use, they should allow for thermal movement. The best way to achieve this is to use a two piece clip design, which consists of a base that is attached to the deck and a second vertical component that slides up and down in the base. The clip’s sliding feature allows a typical 60 foot metal panel to move about one inch, which is usually enough to manage thermal movement. However, to be effective, a clip must be installed correctly so that there is a water tight seal between the clip and the panel, and the clip doesn’t bind during movement.
Thermal movement is a force of nature, and because it is happening continuously, it is often a major source of roof leaks. So part of choosing a metal roof then, is choosing a designer who is equipped to accommodate for thermal movement and the forces involved. This way, the metal roof you choose should not just withstand daily temperature fluctuations, but also weather major storms for many years to come.
This article is brought to you by ASAP Roofing, a national roofing company that specializes in hail restoration, weatherization and exceptional customer service. ASAP has offices in Denver, Dallas, Salt Lake City and Indianapolis.