That’s a reasonable estimate based on architectural shingles, although 15 years is more likely in latitudes with more solar exposure throughout the year (the Sunbelt in the US). Metal roofs last longer, but have a higher initial upfront cost. Huge fan of metal standing seam roofs for longevity (40-70 year lifetime) as well as robust mount support (clipping to the seams) for solar racking.
Yes, there are types of roofs that last a long time. Standing seam metal, slate, clay, concrete, and copper roofs all last a long time (50+ years). Asphalt shingles and EPDM flat roofs last 15-25, cedar shakes can last 30+ years.
The long lasting ones are substantially more expensive than asphalt shingles, 3x at a minimum.
We just had to replace our tile roof for a 20 year old house. I've seen estimates of 20-50 years and I'm sure you can find some that last centuries, just don't buy a tile roof expecting it to do that. There are still Ford model T's on the road today, but we don't tell people that cars last a century.
I had a house in Phila. with a tile roof, built in 1920. I "replaced" the roof in 1995, and by that I literally mean re-placed: the roofers carefully took all the tile off the roof, put down two layers of 80lb roofing felt, and reinstalled all the tile. They believed that the original was done with only 1 layer of 40lb roofing felt, and that this was the only thing that had actually failed other than a couple of cracked tiles. There was some expectation that the new one might last 100 years before it would need the same process again.
What was the failure mode of your tile roof that meant it needed replacing? Coming from the UK where most roofs are tile I don’t think I ever saw one need replacing there, maybe a few tiles need realigning. Most tile roofs were the same as the house itself, so over a century for large swaths of the country. The weather is less extreme than in the US though.
"Tile" in the US probably (though not definitively) means "spanish tile" - those terracotta curved tiles. It's not the same as what I remember tile meaning in the UK, which was typically slate.
Also, I spoke with some roofers in Pennsylvania who explained to me the difference between Welsh slate and the stuff from PA ... way less durable because the layers are not as tightly bonded, and then you add freeze/thaw and it just doesn't last as long.
correct, Also the underlay needs to be replaced often and if it's not the tiles can come loose or get damaged. Replacing the underlay requires removing all the tile, which is labor intensive, and then depending on the HOA/owner preferences, you can try to color match damaged tiles or replace the tiles, or replace portions, all of these are done regularly. Depending on type of underlay used, it might need to be replaced every 7-25 years, again depending on the weather conditions and materials used.
