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This may be a generational thing, I am GenX. I grew up my entire life hearing "Flat roofs always leak" from the men in the family (none of whom were roofers). Their generation had strong opinions on the right way to do things (This applied to anything). I miss them and I am sad they are gone.

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Technology changes though. PVC membrane roofs require less maintenance and last longer than older shingle roofs.

Flat roofs probably did always leaked when they learned this saying -- but today it's not true.

Many people will tell us flat rooves perform no worse under a given load or precipitation condition than pitched rooves, they both just have to be designed right for it.

But if flat ones are harder to design right, then they're more likely not to be designed right, so we end up with a larger number of edge cases where they're going to perform worse.

In my neighborhood they built a deck which has standing water and does not drain. Builders don't care.

Are slanted roofs with PVC membrane a thing?

> I miss them and I am sad they are gone.

Do you mean the roofs or the boomers?

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