mobile home roof over?

I have a question regarding putting a peaked roof over a flat roof on a mobile home. The owneer of the park requires all flat roof mobile homes to have a peaked roof put on within a certain time period. They do not want a floating roof with the 4x4's going down to the ground. I was thinking about putting a peaked metal roof which only require trusses to be 4 foot on center as opposed to 16 inches on center with a regular shingled roof. The peaked metal roof is also only about 800 pounds as opposed to a 4000 pound shingled roof. The local building inspector wants to know how I am going to attach it to the home and wants a diagram drawn up. Does anyone know the best way to attach the roof to the top of the home?

 

Wwlcome to the forums

Build a knee wall down the middle of your roof and secure it with screws thru the metal into the trusses [they are only 1x2s ] The top of the rafter can be attached to the knee wall and secure the other end to the top of the exterior wall.

Be sure to plan for and allow attic ventilation - this will help to make your MH cooler in the summer

 

Hi Marksr thanks for the reply. I was intending on using prebuilt trusses from home depot so they are already in triangular shape with a bottom board on it so should I just make some sort of top plate connection at the top of the exterioir walls on the roof and put the trusses on that?
Thanks

 

Because your 'flat' MH roof has a crown, you will need to build up each side so the truss will be able to set right. As long as you can secure this added height well, you should be ok using trusses.

 

to avoid adding a short wall at each edge, you may investigate scissor trusses. they are used to provide a vaulted ceiling inside of a structure but theyshould also allow for the convex roof you currently have. I would suggest using installing a plate at the edge of the roof and then truss brackets attached to that and then, of course, set the new truss in those brackets and nail 'er in.

by using long enough screws, you could attach through the existing trusses an into the top wall plate.

btw; I have not seen any roof structure that allows 4 foot spacing short of bar joists and steel (not the lightweight steel you are considering) on top. This is a typical commercial roofing application.

If you are using 4 foot spacing, I would think you would need purlins to span the trusses.

This reduces some, if not all, of the advantage of weight you have due to the lower number of trussess needed. Don;t know where you live but in my area, you must be concerned with snow loads and such.

 

What type of diagram is required by the building inspector (Sonoma County CA) in order to get a permit

 

mrgolf...that thread is about 2 yrs old. The best way to know what the inspector requires..is to go down and ask them. They may be able to show you examples of what is expected.