Renewable power has an Achilles heel: it requires staggering quantities of natural resources, especially metals. Recycling ...

So, if your roof has two layers, it may require a complete tear-off, even though steel is lighter than asphalt. Codes vary, so call your local building department to ... In a standing seam roof, long, ...

In 1981 Taiwan entered a period of intense construction, meaning that today many buildings are more than 30 years old. Lack of maintenance has led to frequent safety incidents involving external walls ...