Hello,
So my first row was a bear to put on. I initially put a string up and did a chalk line at 48 inches, but when I go to put my first board up the board is over top of the line. I decided to try and make sure the first board is straight as possible, then I put in temp screws in to hold in place. I bring up the next osb and line it up and temp put in place. I do the same for the 3rd all look good. I found out that for some reason the trusses are not perfectly square and this is the main reason for some of my issues. For example one truss would measure 24″, another, 23 3/4″ another 24 1/2. These are at the ends of the first of the trusses put up. So, I’m thinking I will just cut off the end of the truss to make 90* cut when done. So now I get to the end and I’m looking at the last osb sheet put up on the gable end and it appears to be 1/2″ off from top to bottom.
My question is if this is truly off (could be a warped board too, I’ve had lots of them here lately) how can I correct the next row so it doesn’t magnify onto the other rows?
Thanks.
Replies
If the ends of the trusses are in a straight line from one end to the other…
then striking a tight chalk line the same distance up the truss on each end and holding the sheets to that line……is the correct method. That gets the first row of sheathing right.
If the sheet edges show a different reveal at each truss, then that’s what’s wrong. Cause? Wavy wall or bogus truss installation.
I have never run across any sheet goods that were as off as you are saying. I think something else is goofy.
That being said, either correct the problem or get the next row of sheathing straight to itself so when you stagger sheets and going up the roof, you aren’t cutting any to “fit”. Use the chalk line end to end and lay all the next row to it. Narrow gaps between the 2 rows won’t be a problem with shingles unless you can step through it
And hope a man on a fast horse doesn’t notice….
Calvin,
No the ends are not lined up. Those measurements were taken from the wall to the end of the truss. So they are in and out.
I did figure out that I was off on my first sheet by a 1/8 of and inch and the first sheet was slightly pointing down (rh side looking from the front), therefore some of the other end of the truss it wasn't exactly straight. Since nothing is load bearing on that. I figure it would be able to cut the end of the truss and then mount the fascisa board to the front to correct. On my next row and this is what I should of did on my first row is look for something that was a constant. Meaning no fluctuations. The take measurements from that to make sure everything was square. Which is what I didbon my second row and now everything is looking better.