Wodd shakes exposure

[Ripshod]

I couldn't find a more apt forum for this, so I thought I'd post it here. I'm doing a renovation of my home and there's a situation that doesn't seem right, but I can't find any facts to back me up.
I have three large gables. Previously, at least two layers of standard roofing shingles were hung on this vertical surface. I had the shingles removed and replaced with cedar shakes.

The 18" shakes were hung with a 14" exposure, single layer. This means that the 10" seam between each shingle is open directly to the tar paper underneath, with no other moisture barrier between that and the unprotected framing.

I find the 2.5 cases of leftover shakes as another clue that they scrimped on the job. Where can I find doccumentation on proper procedures for this kind of application? If there is a standard exposure, I want it adhered to.

Thanks, Rip

[Ripshod]

I hate it when I misspell the topic and can't edit. Of course it should read, "WOOD Shakes Exposure".

[Ripshod]

Thanks anyway, I found the answer on the boxes the shakes came in. It has explicit instructions which weren't followed. I'll have to fight for this one.

Thanks,
Rip

[Troy]

You can edit your post by clicking on the picture for your post.

Glad to know you solved your problem. Welcome to the forum!