Can you put a metal roof over TPO?
Matthew Barrera
Updated on April 01, 2026
Can you put a metal roof over TPO?
TPO/PVC Over Metal Roof Retrofit Both TPO and PVC roofing membranes can be installed over top of existing metal roofs. TPO or PVC over metal roof retrofit is a cost-effective way to permanently stop leaks and without breaking the bank or your maintenance budget.
What goes under a TPO roof?
The substrate under the membrane is either a cover board or the top layer of insulation.
What is TPO flashing?
TPO Flashing is a non-reinforced thermoplastic polyolefin based membrane used for field fabricated pipe flashings, sealant pockets and scuppers when the use of a pre-molded accessory is not feasible.
Can you put metal roofing over metal roofing?
With billions of square footage of metal roofs needing to be replaced, metal-over-metal retrofits are a cost-effective solution that allows a new metal roof to be installed on top of the existing metal roof without having to do a tear-off.
How good is TPO roofing?
TPO is very good at resisting dirt build-up, punctures, and tears as well. The use of TPO on your roof can mean lower cooling costs due to UV resistance. While TPO is energy efficient, it is also made from environmentally friendly products. So, TPO can actually help to lower carbon emissions.
Does TPO need underlayment?
Unlike EPDM, most TPO roofing membranes are white. TPO roofs can resist UV rays by reflecting the light off its surface. This makes TPO ideal for buildings that need an effective insulation system. TPO underlayment is relatively easier to install.
Can you put a metal roof over an existing metal roof?
As long as the original metal roof panels are not deteriorated from environmental conditions, a metal-over-metal retrofit can put virtually any type of metal panel over any type of existing metal panel.
Can I walk on my TPO roof?
Flat Roof Surfaces You Can Walk On Whether its BUR (Built-up Roofing), TPO (Thermoplastic polyolefin), Modified Bitumen, or Single Ply Roofing, your roofing professional can apply the right waterproofing membrane to make it possible to walk on.
Is TPO roof glued down?
A TPO roof can be installed fully-adhered, mechanically-attached or ballasted. When the TPO roof is fully adhered it means that the membrane was glued to the substrate using a special strong adhesive that creates a chemical bond with the TPO.