Which property of crushed roofing slag allows for higher moisture levels compared to crushed stone?

The property that allows crushed roofing slag to retain higher moisture levels compared to crushed stone is its pore structure. Roofing slag typically has a more porous appearance, which means it possesses more voids and openings within its material. This porosity facilitates the absorption and retention of moisture, making it more effective at holding water compared to crushed stone, which generally has a denser and less porous structure.

In applications such as roofing, this property is advantageous because it can contribute to certain thermal and moisture management characteristics, potentially influencing the overall performance of built-up roofing systems. The ability to retain moisture can help in regulating temperature fluctuations and provides multi-faceted benefits in terms of the longevity and durability of the roof system.

Other properties like density, weight, and color don’t directly impact moisture retention in the same way; density and weight are more related to the overall mass and load-bearing capabilities, while color might affect heat absorption but does not significantly influence moisture levels. Thus, the pore structure is the defining feature that distinguishes the moisture retention capabilities of crushed roofing slag from crushed stone.