new user. maybe really dumb question

[benlminton]

i am in the process of buying a newer doublewide. it is a 2003 28x72. it has perimeter block. i am not sure what 2x material makes up the exterior walls or the roof construction. but what i am wanting to do is frame a roof over the existing roof. there is nothing wrong with the current one, i just want a higher roof pitch. the current pitch is 4/12 and i want to put a 6 or 7/12 pitch on it. the area i live in does not have building code. the way i plan to do is by putting rafters from joists that will be fastened to the existing roof up to a ridgeboard and then sheathing over it, then applying shingles. is this totally out of the question? is this too much weight on the exterior walls? i have a friend in the mobile home business who says it would be ok, but he is in sales and has nothing to do with services, constructions or the doublewide im buying. i would appreciate input from people who know. i attatched a photo of the house. thanks

[Greg]

Hi & welcome to the family. First let me congratulate you on your question, many people do not even think about the added weight. Since it is a newer home I would assume it has at least 2x6 outer walls, that said, the should support the added weight. I would do a permiter blocking under the rim joist to make sure the floors do not start to flex.
I am sure JD our resident roof expert will see this and add to it. Greg

[benlminton]

thanks for the speedy reply. i am dumb about this, but im guessing that the perimeter block that is there for skirting im assuming is not supporting the header joist is it?

[Yanita]

Hi,

Unless you know exactly what your outer walls are I would forgo this project.

The added weight to the exterior walls could cause some serious bowing/flexing of the floors. The skirting is not any support what so ever, even if it is block/brick. Typically block/brick skirting still stops short of the rim joist.

Does your home have out riggers?

I will leave you with a link that better shows how a MH is built, but the diagram is of a single wide, not a multi section home.

You might get away with this if you completely remove all existing roofing materials. Typically it is not even advisable to have 2 layers of shingles on a MH roof due to weight.

JMO,

~Yanita~

http://www.mygreathome.com/fix-it_guide/diagram.htm