Originally Posted by booklady
Looks to me like the light blue triangle is not big enough. When you sew it on it should hang off the top by 1/4 inch. Then when the 2nd triangle is attached, it will sew over the roof and the 1/4 of the blue to make the top corner. That will then leave a 1/4 of the blue for top seam.
I'd make the blue at least 1/2 inch bigger and sew from bottom of roof to top. You can always cut off the extra at the top.
Just MHO though!
Looks like my reply crossed your answer at the same time. I have carefully checked all of the measurements and have cut them correctly. So the seams should hang off by 1/4 inch? I don't think it did- guess that's obvious to you. The first blue triangle is larger as it is than the one that is sewn in pieces and that one seems too large. This is very confusing.