Trusses are about the top board and bottom chord being able to spread the weight of a full load of snow and wind between them. The top board wants to bend down and compress a bit, and the bottom chord wants to pull apart.
They get ratings from their manufaturer.
Either you follow these ratings, or you get them cheap and way way overbuild......
Are you going to build the special end trusses yourself, or just use one of these for each end? Typically the end ones are built differently.
So you have 60 feet, if you make the 2 end trusses, these 8 could be spaced every 6 feet.
That might work. They do not have a real strong bottom chord, but might work.
If you are trying to use these 8 spaced out including the 2 ends, that puts them at 7.5 feet.
Boy, just eyeballing it, they look weak for a near 8 foot span.
My 48 by 81 shed was built with 9 feet between the trusses, but there is a 'lot' more beef on the chords.....
It is all an engineering game, size of the wood, the number of braces in each truss, the way they attach to the wall, and so on. An engineer can figure out what you have, but your point was to be cheap which I respect very much, just you need to overbuild then, not try to get by on the edge of what they will take......
House trusses are built for 16 or 24 inch spacing, I hope that isn't what you got...... Those are smallish chords on the picture... Since you won't have the live load a house does, you could stretch them a little more, but not to 6 or 8 feet!
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