Metal Roof Thermal Expansion

For example expansion and contrac tion can cause metal components to.

Metal roof thermal expansion.

Get free shipping on qualified metal roofing or buy online pick up in store today in the building materials department. The following table provides the coefficients of linear thermal expansion and representative thermal expansion values for various building materials where possible the values were taken directly from manufacturer technical data sheets and reflect the coefficients of linear thermal expansion for specific representative products. Also the surface temperature of metal roofing materials can range from 25 degrees. As the lumber expands it moves and it will rub against other pieces of wood that aren t moving at the same rate.

Metal roof systems can be the least forgiving of all roof sys tems if provisions for expansion and contraction are neglected. The rate of thermal movement varies by the type of metal installed and temperature of the base metal. It might be the wind. Thermal expansion contraction is responsible for most roof leaks.

Metal roof thermal expansion. A formed metal component anchored to the building substrate used to secure two pieces of metal to each other or to secure metal shingles or standing seam roofing but can move with the metals expansion to allow for thermal movement. Expansion and contraction factors often are overlooked or regarded as insignifi cant in metal roof system design and construction. It is important to note ambient air temperature will differ from the temperature of the metal and direct solar radia tion plays a major role in this process.

In the long run a properly designed weather tight roof will cost less than an improperly designed leaky low cost roof. The term thermal movement refers to a material s dimensional changes resulting from temperature swings. A material experiencing a rise or decrease of temperature expands or contracts respectively this poses an interesting challenge when it comes to designing metal panel roof assemblies. You can demonstrate this to yourself quite easily by trying to carry something large and flat on a windy day.

It s thermal expansion and contraction. Years ago as a young builder i almost got blown off a roof while trying to carry a sheet of 4 by 8 plywood.