Page 231 - 39. MRH13-05-May2013-P
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STEP 8A: Adding the Major Ribs
Continued ...
With the ends and the center set, I measured the
distance between the 1” x 6” and found it was 17’-
3”. I divided by 2 to come up with the distance to the
center of the rib which is 8’-8”. I then subtracted 3”
from that dimension which yielded 8’-5” This is the
distance between the edges of the ribs.
Once the mid-point rib bases were placed, there are
two rib bases to be placed in between all of the ribs.
As I cemented the ribs down I used my calipers to
make sure that the distance was equal for the length
of the roof. I found it’s easy to get a piece skewed a
bit, so this is a good check.
I followed the same procedure at the ends, except I
divided the distance by 3 since there are 2 ribs in this
space. This time I needed to subtract 12” from the
distance, the width of 2 ribs, generating a distance of
29” between the rib bases.
Again I used the calipers to make sure that the ribs
were equal distance as I cemented them in place.
When I finished, I had a 29” spacing between all the
rib bases.
