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Question DetailsAsked on 12/14/2016

How much does it cost to replace Polybutylene pipes in mobile home

I have a 2 bathroom mobile home and am having trouble with all my shutoff valves leaking in the entire home. I also have found that the previous owners have the lines of the shower and toilet running off the sink in both bathrooms and I think they did the same in the kitchen and laundry room. So I will probably have to have the entire mobile home replumbed and was wondering how much money to save up so I can get it done hopefully soon since I'm replacing both bathroom floors as soon as I get this plumbing under control. Don't want any leaks on my new floors!

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I asked my go-to plumber about this - he said probably at least better part of $1000-1500 unless you have a small one-bathroom mobile home where the bathroom and kitchen and such are all back-to-back so there is basically only one small area with plumbing - but you have 2 bathrooms and a laundry room so sounds like a substantial sized mobile home. He said not unusual to go into the $1500-2000 range (piping replacement only, not including cost of any new fictures like faucets or shower valves or such) for larger manufactured and mobile homes, and higher if there is not clear access underneath or it is filthy under there, the work requires tearing out and replacing pipe or mobile home underside insulation, working in significant cold conditions (since much of the work is done under the trailer), or if you choose copper versus PEX.

One option on the bathrooms if you have to because of very cold weather, need time to clear out junk under the trailer for access, etc - though would require some coordination with flooring guy and plumber and probably having the bathrooms done one by one so you have one for use at all times - would be have the flooring guy tear up a floor, then have plumber primed to redo piping under that floor section within a day or so and any fixture changes you plan to do in that room at the same time, have flooring finished, then do same cycle on the next bathroom. Would cost a bit more than doing all the plumbing at once but might meet your schedule better, and avoids risk of flooring damage due to PB tubing failure under the new floor.

The shutoff valves (which commonly leak a bit after about 10-15 years or so when operated, or about 20 years or so regardless) can be replaced without replacing the tubing, you know - there are special retrofit fittings designed for use with PE/PB tubing which are better than the old ones. If the shutoff valve leaks are around the stem, commonly just tightening the stem a bit (if not very old) or replacing the bonnet gasket or O-ring will solve that - probably $200-250 or so to do that to all of them if they are not real badly corroded. If by "leaking" you mean the shutoff valve does not shut the water all the way off when turned off but is not actually "leaking" water into the surrounding area, that can commonly be fixed as part of replacing the bonnet (valve cap) seals. Even if the valves are corroded and shot, commonly they are threaded connections or can be replaced with compression fitting valves so likely $300's range would replace the probably half dozen or so you have in your home, if that is the major concern rather than the life of the PB tubing.

One other consideration - if replacing piping in a shower or tub, because of the access issues and possibility he will hve to tear into a wall to do it, consider replacing the hardware there too at the same time - so you are not into major plumber cost to replace a leaking shower control valve or such in the next few years. Little additional cost in most cases to change out the fixtures while he is in there, other than the fixture cost itself which for a decent normal brand like Peerless/Delta might run a couple hundred $. Sinks and such not a big issue, as normally changing them out in the future is a simple matter because the connections are exposed under the sink.

Answered 3 years ago by LCD

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