An aerial view of most urban areas shows swathes of asphalt, black tar and gravel-ballasted rooftops. Heat radiates off of the dark roofs and water rushes over the hard, hopefully impermeable ...

Q: When you were writing about roof repair and replacement, I never saw anything on tar-and-gravel roofs. I just bought a house. At my prepurchase inspection, I was told the roof was in pretty ...

Mathematical models are extremely limited at modeling ballast, the gravel layer located under railway tracks. Researchers have shown that a large part of the energy introduced by a train passing ...

Cement, concrete manufacturing, and the production of railway ballast, road base & coverings, crushed stone, sand, gravel, concrete blocks, pipes, bricks, and high-rise building materials are in ...

Alusín Solar has released the Picos Coplanar mounting system for flat DECK-type roofs with PVC or asphalt surfaces, eliminating the need for drilling.

Landatu Solar has introduced a lightweight, plastic system that can be filled with water, sand, or gravel to function as a solar mounting system on flat surfaces. The units can be stacked on top ...

The New Milton Sand and Ballast company wants to grab 800,000 tonnes of sand and gravel from Downton Manor Farm, Milford-on-Sea. But it has met with another planning rejection.