Roof Insulation: EPS vs XPS [Infographic]
Since typical membrane roofing does not include the insulation factor, as a customer you have more options to choose from to insulate your facility’s roof. There are a few types of insulation options the facility manager/owner can choose from:
- Polyisocyanurate (Polyiso)
- Extruded Polystyrene (XPS)
- Expanded Polystyrene (EPS)
Types of Roofing Membrane Insulation
Extruded Polystyrene (XPS)
Usually defined by the blue, green or pink color, XPS falls in-between Polyiso and EPS in the range of price and performance. Extruded polystyrene consists of a blended polystyrene polymer heated and ran through an extrusion process. (Facilitiesnet.com)
XPS is semipermeable with a perm rating of 1. The average cost of extruded polystyrene insulation is $0.42/sq ft. for a 1 in thick panel. The average R-Value is R-5.
Expanded Polystyrene (EPS)
With the highest R-value per dollar, EPS is used for roof, wall and floor insulation. EPS can be used with for ground contact and does not retain water over time.
Expanded polystyrene consists of the polystyrene polymer impregnated with a foaming agent. The material expands when exposed to heat and is molded into a uniform, closed-cell insulating material. (Facilitiesnet.com) Commonly known as beadboard, EPS is also used to manufacture products like coffee cups.
Insulfoam: EPS Environmental Advantages
The average cost of expanded polystyrene insulation is $0.26 /sq ft. for a 1 in thick panel. The average R-Value is R- 3.6 to 4.2, depending on panel density.
Single-Ply Membrane Roofing Systems have been the go-to roofing for commercial, industrial, and manufacturing facilities for decades. Contact West Roofing to talk now or subscribe to learn more about commercial roofing systems.
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Author: Rufus West
Rufus West is a commercial roofing expert! You may see him on the West Roofing website and also on the West Roofing social media pages, giving fun facts and tips about the company and roofing industry.
Just like West Roofing System’s roof solutions, he isn’t bothered by water—it simply rolls off of his back!