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?