Metal Roof Thermal Expansion

You can demonstrate this to yourself quite easily by trying to carry something large and flat on a windy day.

Metal roof thermal expansion.

As the lumber expands it moves and it will rub against other pieces of wood that aren t moving at the same rate. Get free shipping on qualified metal roofing or buy online pick up in store today in the building materials department. 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. Metal roof systems can be the least forgiving of all roof sys tems if provisions for expansion and contraction are neglected.

Expansion and contraction factors often are overlooked or regarded as insignifi cant in metal roof system design and construction. The wind pressure against a roof or an entire home can be enormous. Also the surface temperature of metal roofing materials can range from 25 degrees. Thermal expansion contraction is responsible for most roof leaks.

It might be the wind. It s thermal expansion and contraction. The sun hits your roof and heats it up. Years ago as a young builder i almost got blown off a roof while trying to carry a sheet of 4 by 8 plywood.

The rate of thermal movement varies by the type of metal installed and temperature of the base metal. 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. For example expansion and contrac tion can cause metal components to.

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. 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.