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* Polybutylene plumbing. It's a plastic that chlorine eats. We of course didn't KNOW this until the plumbing started failing. Remediation involves tearing all of it out and replacing it with either copper, PVC or PEX. (PEX is crosslinked polyethylene. They tested it by throwing pieces of it in Clorox and leaving it there for years--with no reduction in strength. This is good pipe.) Polybutylene can be gray, blue (the two most common colors), white (PEX is white; PEX usually isn't) or black (ABS is black; PEX usually isn't). Polybutylene and PEX are both connected with crimp-on copper rings--so if you run across pipe that's white and has crimp-on rings it's one or the other...but PEX always says it's PEX on the side of it.
* A Federal Pacific breaker box. Sometimes the breakers don't trip in response to overloads. Lots of house fires have started this way. Remediation calls for replacing the panel.
* Aluminum wiring. When they started using it they tried using the same gauges in aluminum they used in copper--12AWG for 20-amp service, 14AWG for 15-amp service. After some homes burned down they realized you have to go one gauge larger. Then we ran into wires loosening, galvanic corrosion, all sorts of weird shit. Just know that if there's aluminum wiring in the house, it's probably gonna burn down. (Fire and Water Restoration is a popular trade in Fayetteville, and we sell to many of the companies doing it. I got sent out to measure a home for drywall and insulation, and met a fire department investigator. Apparently they thought it was arson because the home caught fire in a "suspicious manner"--basically, the fire started in every room in the house at about the same time. Arson didn't make much sense to me because the homeowners were going to move back in after the remediation--and most people wouldn't burn their house down to get new carpeting. So I'm walkin' through with her, measuring and logging, and asked if the home had aluminum wiring. (She's looking for accelerant traces--which you would normally have in an arson.) "Why?" 'Well, I'm standing here counting all the electrical boxes so we can bid out the materials, and they've all got char marks above them...and the char marks seem to all be about the same height.' "If you've got a screwdriver, hand it over." Every electrical device in the whole house failed at exactly the same time.)
* Two-prong outlets. These days, a lot of really juicy stuff needs grounded outlets--computers in particular. Two-prong outlets mean either the center screw is grounded (which means you get to replace all the outlets with three-prong ones) or there's no ground to the box (which means you get to rewire).
* Resilient flooring in a house built before 1985. It's got asbestos in it.
* Black streaks on the roof, or curled-up edges of shingles. Usually a new roof is called for.
I'd buy a house that had all those faults...as an investment, for not very much money, and then I'd gut it and redo everything. If you want to LIVE in the home, try something that doesn't need $25,000 worth of repairs.
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