DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Framing and Foundation > Leveling webbed/engineered floor trusses




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Old 01-15-2014, 09:34 PM  
GBR
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Using a caulk line to extend a 4' level line to 20' is very open for error. Just a sixteenth off in the 4' will give almost 4" in elevation difference in the 240' of building-if dropped 1/16"x 5 (4') each 20'. May work for 20' as you said, only off 5/16" that way, though I would never suggest that procedure to anyone for any elevations- other than something 8'maximum long with a straight-edge and the 4' level. Using a 4' level alone is accurate to 4'. I think the OP is trying to find the high/low ones to plane them all, too late in the ball game to level everything if he never checked the slab before framing began.... could get the bulk out.

Gary



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Old 01-15-2014, 10:55 PM  
nealtw
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Your laser level is good at one hundred feet to be + - 1/8", unless you paid the big bucks on it, then it's good to + - 1/16. Add to that that your dot woill be more than a 1/4" blob at that distance.
If you want accuracy you use a builders level (transit) which has two spirit level about 3" long.
In less than a minute you check the 4 ft level by holding it level on a wall and drawing a level line turn the level end for end and consult the same bubble.

Now how about you tell me how to check the accuracy of the transit or your laser, we learned the hard way that they do have to be checked.

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Old 01-16-2014, 08:04 AM  
Wuzzat?
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Quote:
Originally Posted by nealtw View Post
Your laser level is good at one hundred feet to be + - 1/8", unless you paid the big bucks on it, then it's good to + - 1/16. Add to that that your dot woill be more than a 1/4" blob at that distance.
If you want accuracy you use a builders level (transit) which has two spirit level about 3" long.
In less than a minute you check the 4 ft level by holding it level on a wall and drawing a level line turn the level end for end and consult the same bubble.

Now how about you tell me how to check the accuracy of the transit or your laser, we learned the hard way that they do have to be checked.
It seems the price paid for a laser level does not correlate very well to accuracy, so user convenience must be the main price driver.
http://www.grainger.com/search?searchQuery=laser+level
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