I am new to the business.  Went to a residence that has a mobile home that has an addition and metal roof.  This roof is about 8ft above the original mobile home roof at the ridge and extends passed the home to form a covered porch.  This roof is raining water from condensation on the old roof and ruining the new soffit not to mention all the other problems the water will cause.  The metal roof is uninsulated but has a white membrane of some kind (not Tyvek).  It has a vent on both ends 1ft x 2ft and some small openings on one side of the lower roof just after the porch roof.  The original roof has about 4" of fiberglass insulation.  The roof cavity is open and there is about 2 to 3ft  feet of clearance with no other obstructions.The addition has about a 1:12 roof that has fiberglass  insulation with a plastic covering that has been stuffed into the cavity filling it.  The water scares me for liability reasons but would like to help if I could.  Do I insulate the underside of the metal roof?  Do I blow in insulation into the old roof.  Do I foam the top of the existing? Do I walk away? Heat is propane wall units and fireplace.  Location Seattle

Views: 175

Reply to This

Replies to This Discussion

LOL, par for the course with some of these fixes for mobile homes - you are talking about a second roof added above the first one / not attached at all? The easiest fix is to install a system like one uses under the deck to drain water away - insulating it wont help. As for the addition part, you didn't really describe it all - pictures do help - so I cant even begin to guess on that

As for old roofs, insulating, etc... it all depends & as I said there isn't enough info. For more on Mobile Homes & tricks used - http://blog.sls-construction.com/2010/weatherization-program-modula...

I can't understand the situation very well, but you noted "propane wall units and fireplace".  I will bet that they are all unvented; burning propane produces a GREAT amount of water vapor into the living space, as well as the products of combustion(!!).  If that's the case, I would have them read the lots of negative information about unvented gas appliances, and if they don't change them, first for their own personal safety, second to stop the water production, then run away. 

A quote from one source I found: "Any amount of propane that you burn in a space heater will produce approximately 163 percent as much water."  Then there's the carbon monoxide(!!), oxides of nitrogen, etc.  all of which the living and breathing should not be living with.

Walk away. To be blunt, in my opinion, if you are asking these questions on this project, you should be starting with less complicated jobs.

Manufactured homes are not the same as stick built, although there are similarities. The bathroom vent fans are typically vented through the roof, which would be dumping warm moist air into the new roof cavity. I have found some manufactured homes to be rather tight, leading to higher Relative Humidity. Usually there is a furnace that is also vented through the roof, which may not be flashed properly or kept away from combustibles with the new roof. Did they properly extend any of these roof penetrations (flue pipe, stack vents, etc)?

Did they cut holes in the original roof? There are different ways to fix this, but the added metal roof will make it more challenging to resolve. Dense-pack cellulose is a possible solution, if done properly. Spray foam is not a solution, unless you are going to rip off the entire roof. 

Pictures are needed.... but honestly,  I'd walk away.  I live in Seattle area.  

If for some reason you need to stay with it and work on it...  you need lots of pictures - for your protection long term, and you need to test-in and test-out.

Adding any insulation without understanding the problem is going to cost you big time.

RSS

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.

Latest Activity

Patrick Michaelyan replied to Luis Hernandez's discussion Non-continuous exterior insulation
"Don, I'd like to ask you specifically about your comments on putting the structure at great…"
4 hours ago
Patrick Michaelyan replied to Casey Gesell's discussion Looking for home improvement companies to join our dealer network!
"Casey, Time frame for relocating is late spring to early summer. I am considering both counties…"
5 hours ago
Dennis Heidner replied to Patrick Michaelyan's discussion Vinyl Siding with Integral Insulation
"The observation about rot is important.   I agree. One of my complaints with some of the…"
yesterday
Jennifer Schenk added a discussion to the group Job Board
Thumbnail

Job Opening - Energy Programs Manager - Frisco, CO

Energy Programs Manager - High Country Conservation CenterJob DescriptionGeneral Description of…See More
yesterday
Jennifer Schenk joined Diane Chojnowski's group
Thumbnail

Job Board

This group is for posting jobs related to all aspects of the home performance industry including…See More
yesterday
Avi Yashchin posted a status
""Will Online Learning Replace the Classroom?" Read my full article on HuffPost. http://huff.to/1cNCOie"
yesterday
Profile IconTerrell, Jennifer Schenk, Amina Lang and 3 more joined Home Energy Pros
Friday
Patrick MacRoy commented on Melissa Ulbricht's blog post How to Optimize On-Bill Financing to Help Illinois Building Owners Invest in Energy Efficiency
"Many of these recommended improvements are included the Clean Energy Jobs bill recently introduced…"
Friday

© 2015   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service