Thank-You....Byrdman

[ChucksCrib]

Following your lead, I took your approach to adding shelving to my garage attick with pre-fab trusses. I should be able to store a bunch of **** up there.

 

[MacTexas]

What a great idea. You never can have enough storage space.

 

[ranger_dood]

Just don't overload them, and watch your head!

 

[DaveL.]

Nice Job Chuck..I guess I oughta get busy when it cools down. What R-value insulation did you use? I've got that blown in stuff all over the place. I'm thinking of maybe adding some rolls up there over top of the blown in stuff.

Dave.

 

[ChucksCrib]

R19(6 1/2" thick) kraft backed. Depending on how cold it gets in there this winter, I may roll out a blanket insulation over the R19 next year.

Oh yeah, I scored a kerosine heater this weekend at a tag-sale down the street from where we live...."Kero-World 2800" or something like that.

 

[byrdman]

Very cool, very cool! Looks neat to see that incarnated in someone else's space! You gonna put a little backsplash on it?

And, when RangerDood says "watch your head", that's damn good advice- roofing nails going into your scalp hurt!

 

[ChucksCrib]

No I wasn't planning on putting the back splash in there. With some of the oversized stuff it will make it easier to hang that stuff off of the edge of the shelves.

I did wear a baseball cap which caught a couple nails but my back caught more of them :tard:

 

[Wile1Coyote]

You didn't tie the shelves down to the supports right? Sorry can't remember from byrdmans orig post. Trusses tend to move based on the temperature and if they are tied down bad stuff happens.

 

[dink]

Man that is a great idea....I will jot that down in my notes for things to do for my garage

 

[ChucksCrib]

You didn't tie the shelves down to the supports right? Sorry can't remember from byrdmans orig post. Trusses tend to move based on the temperature and if they are tied down bad stuff happens.

I never thought of that but what "bad stuff" can happan? I used screws to hold the OSB to the supports on the trusses. Wouldn't the OSB expand/contract as the trusses do, due to temperature?

 

[Wile1Coyote]

I'm not an architect OR a structural guy but my understanding of it is that trusses tend to expand and compress vertically with changes in the temp, this varies based on the load the truss is carrying and its position from load bearing walls etc. They don't all compress equally therefor if you tie them together in the linear fashion as you have. That force gets spread across multiple trusses and may not allow a given truss enough room to move about on its own?? It's what I was told when I did a very similar thing in my attic, so anyway the supports are Ok since they are only on one stud, if you just remove the decking fasteners then the hole thing floats a bit more and allows each truss to move as it will. Not sure about the OSB but I suspect it won't expand\compress with the truss as it is only placed in stress by the truss and whatever is on it. OSB might be OK I did mine with 3/4 ply which is quite a bit more solid. I din't connect to the supports at all though the decking just sits on the supports. Doesn't move much that I can see either??

Just a thought for ya, perhaps someone who really understands the principles here will wander in and explain it better.

 

[ChucksCrib]

Not sure I follow completely but I'll keep an eye on things. (cracking tap/sheetrock for example) What about the plywood on the roof. That certainly ties the trusses together?

 

[byrdman]

Interesting point. I too would like to hear a qualified engineer's point of view on this one. I'd almost think that if trusses compress/decompress at rates independent of one another, that tying them together might be a good thing? I'm definetely not the authority on this one.

I concern myself more with the additional weight of OSB shelving/flooring, and the weight of whatever I store up there. My trusses were not designed with that in mind.

 

[bmwpower]

According to my manufacturer, you're supposed to tie the trusses together internally. There's a bunch of different ways they show you how to do it, but mainly it has to do with running a diagonal board across the trusses. Basically, helping them "stand up".

 

[ChucksCrib]

Well, if that's the case I think we should be okay. But I'll be watching this one closely

 

[byrdman]

According to my manufacturer, you're supposed to tie the trusses together internally. There's a bunch of different ways they show you how to do it, but mainly it has to do with running a diagonal board across the trusses. Basically, helping them "stand up".

That seems right. My builder had 2x4's nailed diagonally across the internal W part of the trusses before the shelf idea was born. Until now, I wasn't sure if he did that for initial bracing while he raised the trusses, or if that was permanent bracing designed to prevent lateral shifting.

 

[ChucksCrib]

Mine did not come with the braces across the trusses

 

[Wile1Coyote]

Mine either, I'd hazard a guess that was part of the build process as I have done that while adding roofs to barns or additions in the past. As far as the plywood roof sheeting being a tie together and conversely ceiling material as well, that doesn't count because it is not 'inside' the structure of the truss. Also if done properly those roof decking boards were seperate with special clips between them that allow for regular spaces for expansion and contraction and I'd gather you didn't do the same on your shelves. You'll probably be fine Chuck due to the material OSB would probably give in in a tug of war with stud material OR the fastener will move. You used screws though and they don't move around as much as nails would. Still you plan on moving in a few years anyway right?

Just kidding you man it will be fine I'd think.

Jon