So I have property in Northeastern Washington that I am trying to move to asap (corporate america is sucking the life out of me). Already have septic and water. I'm looking to move a used older (cheap) singlewide mobile home on it to live in until we decide what to build (we have three kids so a tent or RV won't work). We will more than likely keep it on the property and renovate it. Sustainable affordable house that we will own. I want to accomplish this this year. Not alot of funds for this. The County has a snow load requirement of 50 lbs/sf. (with a WA state structural engineer to sign off on the permit stating it meets the snow load requirement) Most mobiles do not have a snow load that high. I do not want to spend 5K+ for a roof over pole structure to go over the entire singlewide. What are my options? Do I have any? is there anyway to look up a mobile home serial number to check the snow load if we find one we want to purchase, or do we need to hire an engineer to look at it? are there plans out there to put a new snow roof on a mobile without hiring someone? Has anyone done this? Any advice would be helpful. thanks!
As an example, I found the below single wide that looks like it has a snow roof on it but the owner doesn't know the load. It looks like it would hold 50lbs/sf...link below
You look at code https://law.resource.org/pub/us/code/safety.html for WA it looks like IRC 2012. You look at load requirements in Structures Loads for roofs, you look at the tables that give rafter spans and depths, sheathing requirements, etc....if you comply you satisfy the permit you show it to the inspection office or get with them for help to take a "prescriptive path using code" If you do not you have to hire an Engineer (analytical path" to satisfy the requirement of the existing structure or if not new, there is no other way other than moving to rural where there are no codes. The requirements to take snow loads are no different for mobile homes, unless it is noted in code. If you purchased in your state it should comply.
If you know the manufacturer and have the serial number, a call to them might get you the snow load information you need. If you are planning on putting on an over roof, first thing you will need to know is stud type and top plate, and bottom plate to frame connection. If these are not substantial enough you might need to install double studs but if the bottom plate to frame connections are not substantial enough (16" on center) then you are either going to have to reinforce these areas or go with the free standing roof over method. Lots of MF homes are 2x4 with 24" on center walls, this will not support the load requirement of 50# sq.ft. for the over roof you are discussing.