The short answer is, it depends.
Spray foam insulation is applied internally. It can be sprayed in the attic space, in crawl space, on walls.. The list goes on. Spray foam insulation expands to fit the gap or crevice. This ensures that there is an airtight seal. meaning there is less cold air coming in and less hot air going out. Spray foam has an array of benefits in comparison to more conventional types of insulation such as cellulose and fiberglass. Briefly, it can decrease utility bills and increase the value of your home. After installation, most homeowners notice a dramatic decrease in the usage of heating systems. You can find a full list of benefits here.
Spray foam insulation can be applied quickly and efficiently, with most jobs taking no more than one or two days, depending on the size. It is often used in mobile homes, barges and containers as well as standard structures due to it's versatility.
In comparison, external insulation wraps around your home. It can add 6 inches to the width of your home on all sides. Furthermore, the government is promoting external insulation systems with grants of up to €6000 to those who apply. Although the insulation is being added to the outside of your home, it can be rendered any way you please. You can match your existing look, or completely overhaul the appearance of your home.
The installation process of external insulation tends to be a bit longer than spray foam, as there are a few stages involved. You can read more about each stage here.
Contact us today to get a free quotation, or to find out more about any of our services.