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Four Types of Blow-In Insulation

Feb. 12, 2022

Automatic Rockwool Production Line

In today’s blog, we discuss four different types of blow-in insulation, including mineral wool, rock wool, fiberglass, and cellulose insulation.


Mineral Wool

Mineral wool insulation has a loose fill. It comes from recycled materials, such as blast furnace slag or a fine-grain rock. Installers can combine mineral wool with a liquid for spraying onto open walls. Mineral wool also works for blowing into wall cavities. This type of blow-in insulation can cause health hazards if it’s inhaled. That’s why anyone who works with this type of insulation must clean every last bit of it up before a job is complete.



Although you may be familiar with fiberglass batts or rolls, this type of insulation also has a blow-in variety. Fiberglass requires special handling as the fibers are made from little bits of glass. The wispy, compact strings of materials have acceptable R-values, but like with mineral wool and rock wool, installers must clean up every last bit of fiberglass. Otherwise, this kind of blow-in insulation can be hazardous to your health because of inhaling very tiny glass particles.


Rock Wool

Rock wool is similar to mineral wool for blow-in insulation. Rock wool and mineral wool are somewhat denser than cellulose insulation. That’s why you may not need as much as cellulose. It also fills into a wall cavity easier because gravity acts on it more readily due to its weight. Because rock wool and mineral wool are heavier, installers could have a harder time moving it around. The material may also settle within your walls, causing pockets of air that reduce the efficiency of insulation.


Cellulose Insulation

The best kind of blow-in insulation comes from cellulose. Products such as Nu-Wool cellulose insulation are made of recycled newspapers. There are no microscopic bits of dust from minerals, rocks, or glass that might get into you or your family’s lungs. Nu-Wool is safe to install and resists burning thanks to treatment with borate. Our technicians let you know how thick a layer of cellulose insulation needs to be for optimal effectiveness in your walls, attic, or crawl space.


Our Services

Automatic Rockwool Production Line

For the rock wool production line, we provide a full set of services including terrain layout, equipment installation, commissioning, personnel training and spare parts after-sales.

At the same time, we also provide the following equipment separately:

  • Centrifuge

  • Heat curing furnace

  • Slitting machine

  • Automatic heat shrinkable packaging machine

We will try our best to meet the needs of customers, serve them and help them succeed!

We are an Automatic Rockwool Production Line supplier, please feel free to contact us if you need them!