Red Cedar Shingle Exposure chart

Hi,
Is there a problem with this?
I did not notice an instruction chart for red ceddar shingles (blu label - the best quality).
I put the shingles on a roof pitches of 20°. Shingles length 16´´. I have done about 180mm exposure and after I notice it is recommended about 125mm. I used an water shield under (breather roofing membrane).
So they says should be 1/3 and I have 1/2 overlay.

Please any ideas?

Yes there is a problem with it, there is not enough headlap.

How much is installed so far?

Check out this site. This is the Red Cedar and Shake Bureau manual. This should help you.

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