Another truss question

[Rodmo1]

hello again,

I am currently in the final stages of building my 24x28 pole building. Very shortly the siding will be done and that will leave me with the interior to finish. My question is...my trusses are listed as 30-0-10...What do these numbers mean? I believe the first number is max psf. However the next two are kind of important to me right now as I am deciding what material if any I can use for my ceiling. Ideally I will use drywall or OSB both would be 1/2" thick. Knowing what I learned through this process I would have specified exactly what I wanted to the lumber yard instead of ordering the generic 24' trusses. The whole hindsight being 20/20 thing. Worst case scenario is I spend extra money and hang the lightweight rigid foam if the trusses cannot support the heavier stuff. Any info. thoughts or suggestions would be appreciated. Additional info...24' span, 2x4 bottom top and web members, "W" design, 4/12 pitch

thanks,
Rod M.

 

[Duffster]

All those number mean is it is plenty strong to put up OSB

 

[Rodmo1]

Sorry for the incorrect info but the trusses actually say 30-7-0-10. I believe all these numbers reflect some sort of weight capacity but just not sure what. Couldnt find any info on google. If I remember correctly one of these numbers pertains to the ceiling weight.

Rod M.

 

[20 20]

If I'm not mistakin the 30 is the actual load that the roof can handle. Up here {northern NY} a 30 by most would not be exceptable. I've allways built my own truss or rafters and go above what any code would call for. Seems like someone else could help ya better with all the # ???????

 

[Rodmo1]

yeah, I am a little concerned by the 30# rating. Typically we don't get snowfalls bigger then 12" at a time, however the rare blizzard that does hit us will dump 2-3' . I was looking at some engineering papers for truss design and it sounds like the actual capacity is more like 40-45 pounds. I think the lumberyard that built them is just being very conservative with their numbers. They also designed the garage for my area so I believe that they would have designed it accordingly.

 

[DJ54]

I used white metal siding "cover sheet" on the ceiling, and walls... I figured it to be lighter, no seams to loose heat through, and no joints to put batten strips on. AND should never need painting...

Been there for 15 years, and am glad I did..!!

 

[ForestPro]

30 - is live load on top chord
7 - is dead load top chord
10 - dead load bottom chord

Total load 47# Design for shingle roof

The number you are concerned with is the 10# of dead load on the bottom chord, the drywall weighs no more than 5# per foot and actually ties the bottoms of the trusses together.

 

[Rodmo1]

Thanks for all the responses. Sounds like I will be going with drywall. I like the metal idea however I am much more experienced working with drywall. Might still go the OSB route just not sure how ugly that would be with prices being roughly the same. Just wanted to make sure the truss was designed for ceiling weight.

Rod M.