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Rockwool has many advantages
It has a large water retention capacity, and also holds sufficient air. It holds a lot of water which gives you an advantage against power or equipment failures. And it also holds 18 - 25% air which gives the root system ample oxygen so long as the media is not completely submersed.
It is available in multiple sizes and shapes for various hydroponic applications. Everything from 1" cubes to huge slabs.
Rockwool is also durable, it doesn't readily fall apart or break down.
Rockwool also has some serious disadvantages
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That same quality that makes it durable also makes it an environmental nuisance. Thrown away it does not biodegrade - It's rock. A million years from now it will still be sitting where ever it was disposed of.
It is also a health hazard. Rockwool, like asbestos is made from rocks and minerals the fibers and dust thereof have proven to be extremely hazardous. Wearing a dusk mask when using it is advisable. Rockwool is not as serious a threat as asbestos, but it is still unhealthy.
Rockwool has a high pH and nutrient solutions must be adjusted to accommodate for that factor. It is also susceptible to pH shifts which creates the need to continuously monitor the ph Levels of your system.
Although rockwool has a high water retention capacity it has a restricted root environment and a low buffering capacity for water and nutrients. The water flow to plant roots may be hindered, even when the water content is apparently high.
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When it comes to insulation, there are a few options available to help you keep your home or business more comfortable and energy-efficient during extreme weather. Among these are batts or blankets, which are placed between studs or posts in a structure, then covered over with some type of hard wall surface, such as drywall or paneling. The materials available for these batts include mineral wool and fiberglass as the most common varieties.
A third option that is very popular is blown-in cellulose insulation. This type of insulation requires a blower that uses air pressure to push the material through a hose into an opening in the wall to place the insulation properly. But which of these there options is best for your situation? Here&#;s a quick look at the benefits and drawbacks of all three types of insulation.
In many ways, mineral wool is a superior insulation product. It has a higher R-value per inch compared to fiberglass, about a 22-37% higher R-value. It contains 70% recycled material, making it a greener product than fiberglass at 20-30% recycled material.. With a density over three times that of fiberglass, mineral wool has superior sound-deadening properties. The stiffer batts don&#;t tend to flop over as easily as fiberglass, making it easier to put in place, and they don&#;t require staples or wire to keep them in place. It&#;s hydrophobic, so it won&#;t absorb water or encourage the growth of mold and mildew. Mineral wool is also very fire resistant and can act as a fire stop.
However, like many building materials, mineral wool also has its drawbacks. It tends to be more expensive than fiberglass, often between 25-50% higher in cost . Because it is more unusual, it&#;s not available in as wide a range of sizes as fiberglass and is almost never available in a paper-faced format. Because it&#;s denser, it&#;s also heavier, which can make it more ungainly to handle during ceiling installations. Its dense nature requires the use of a serrated bread knife or wood saw to cut batts down to size, and it&#;s very difficult to find in a loose-fill format.
Here&#;s a quick overview of the R-value you can expect from different depths of mineral wool batting:
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