TPO is a type of single ply roofing membrane. TPO is an acronym that stands for Thermoplastic Polyolefin. It is an abbreviated way of stating the primary chemical composition of the roof membrane. For most buyers, there is little concern about the chemical composition of TPO roofing membrane. Most buyers are concerned about one thing – keeping their buildings dry and installing a roof system that will perform well for a long time.
After the existing substrate is prepared, either by cleaning or removing the existing roof, the insulation is installed. There are a few types of insulation options the facility manager/owner can choose from:
- Polyisocyanurate (Polyiso) – The most used insulation type for roofing applications, Polyiso is more expensive but pays off with a higher R-value rating.
- Expanded Polystyrene (EPS) – With the highest R-value per dollar, EPS is used for roof, wall and floor insulation. EPS can be used for ground contact and does not retain water over time.
- 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. XPS is semipermeable with a perm rating of 1.
The TPO membrane can be attached to the cover board with a bonding adhesive or mechanically fastened. When the membrane is rolled out, the contractor then returns and uses a hot-air gun to hot air weld the seams together.
What is TPO roofing is a question that many building owners and buyers ask when they go to purchase a new roof assembly. When considering replacing your roof system, it is a good idea to give consideration to TPO roof membranes as a potential solution. There is no one membrane that is good in all situations, so it is best to compare membrane options to your unique situation in order to choose the best solution.
When you choose a new roof system it is also important to choose a quality professional roofing contractor who specializes in the type of system that you are interested in having installed on your building or structure.