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I would agree that retrofitting for fire resistant roofing is much more of a problem than most realize. When concrete roof tiles are used in a new building, the trusses or rafters are designed for the weight, but houses in Orange County and Los Angeles County were built using extremely minimal roof loads. I think such retrofitting is beyond the means of most, just as seismic retrofitting is beyond the means of many building owners. As far as brittleness goes, the most brittle concrete shingles are fiber cement roof shingles, a problematic product. Sturdier concrete tiles are used in Florida, and they are not nearly as brittle. But all of these materials have their disadvantages. Metal roofing is light and is a good solution for fire resistance.In a relative's home in Orange County, decades ago the wooden shingle roofs were replaced by concrete tiles. The problem is that the concrete tiles are so heavy, some wood frame roofs have to be reinforced to take them. They also become very brittle year after year in heat and anyone walking on them will fracture the tiles, which leaves a place where embers could rest. Tradespeople like painters, gutter cleaners, some pest removal people end up walking on the brittle concrete shingles. They also are terrible in summer because they absorb heat and radiate the heat down at night, forcing more use of air conditioning.
Also, if one home in a development has not replaced their wooden shingles, everyone else's home is at extremely high risk. If the homeowner does not remove the wooden shingles, the HOA has to try to take legal action against them to get it replaced and that can take a decade of legal wrangling. In my experience, having a homeowner who claims they cannot afford to replace or repair a roof creates an indignant homeowner who will also refuse to pay dues, clean up their yard, or (maybe intentionally) rents to disruptive tenants. Expenses pile up on both sides and no one wins.
I'd guess that many of the apartments and condos, or HOA's in Pacific Palisades and Altadena are up to 40 years old and retrofitting these older residence is very costly.
These things are relevant to what's going on, because communities will have to rebuild, and they should make conscious decisions about how to rebuild.