Good point about the ballast weight. When we looked into EPDM for our older building, the engineer warned us about structural load issues too. Ended up going with TPO—lighter and easier to manage overall. Plus, fire rating was slightly better, which helped with insurance costs. Might be worth comparing the two directly for your specific situation... could save you some headaches down the road.
"Plus, fire rating was slightly better, which helped with insurance costs."
Interesting point, but when I was researching roofing options for my place, I read that EPDM actually holds up better long-term against UV rays. Wonder if the slight insurance savings with TPO outweighs potential durability issues down the line...?
Good point about EPDM and UV resistance—I've seen plenty of older EPDM roofs still going strong after years in the sun. But from what I've observed, TPO manufacturers have improved their formulations lately, making them more UV-stable than they used to be. Still, I wonder if those incremental insurance savings really justify choosing TPO over EPDM, especially if you're looking at a roof lifespan of 20+ years... Seems like durability should weigh heavier in the decision.
That's a fair observation about durability, and I agree EPDM has a solid track record. But one thing I've noticed is that TPO roofs tend to have better reflectivity, which can significantly reduce cooling costs in hotter climates. Over the years, those energy savings might actually outweigh the incremental insurance benefits you mentioned. Of course, durability matters a lot, but if you're managing properties in regions with intense summers, the energy efficiency factor could tip the scales toward TPO.
I recently oversaw a reroofing project on a commercial building where we switched from EPDM to TPO. The tenants reported noticeable improvements in indoor comfort during peak heat months, and our HVAC maintenance costs dropped slightly too. Not saying TPO is always the better choice—just that sometimes the decision involves more than just UV resistance or insurance premiums...
Good points on reflectivity and energy savings—definitely worth considering in hot climates. A couple more things to keep in mind:
- TPO generally has better fire resistance ratings than EPDM, which can help with code compliance and insurance premiums in some areas.
- But EPDM tends to handle hail impacts better, especially thicker membranes (60+ mil). Seen plenty of TPO roofs punctured after storms.
So yeah, climate matters a lot, but I'd also factor in local storm patterns and fire codes before making the call...
