Metal roof panels are typically constructed out of the following material.
An expensive metal that is malleable. Typically used for high end residential roofs, for copings, gutters, and flashings.
A versatile metal that is typically used for flashings.
A lightweight, inexpensive metal that expands and contracts twice as much as galvanized metal.
A strong corrosion resistant metal that is usually only found on roofs that deal with harsh industrial conditions. Stainless steel is an expensive option, but for some the only effective option.
The most common metal used for commercial metal roofing. Features a sacrificial coating of zinc to protect it from the elements.
Wet material should be removed from a job site. You never want to use wet material when working with a roofing system. Wet materials in roofing systems can seriously affect its performance. Wet materials can also promote the growth of mold.
When insulation gets wet it even loses its R-value. Wet insulation should never be used. Some components like metal can be dried out without causing permanent damage to the material. Just make sure the metal are not rusted or corroded before installing them.
As most of us know it can get extremely hot on a roof. Precautions must be taken to prevent heat related injuries to workers. Workers should drink plenty of liquids, to prevent dehydration. Heat exhaustion and fatigue is also factors in hot weather.
Another disadvantage of hot weather is curing times. They are rapid in hot weather. Adhesives may cure faster in hot weather making them difficult to work with.
Typical failures in base flashings that require repairs include:
- Tears or splits due to expansion and contraction.
- Poor adhesion at the top of the base flashing.
- Open side laps
- General deterioration
- Always inspect the immediate area. Make sure water has not leaked into the affected area.
If it is likely that water has entered the roofing system
- Throughly inspect the insulation or roof deck for damage.
- Remove any wet or damaged insulation and repair the deck if required.
- Install new insulation