I disagree with ya on this one mate. I may not report the condition as a defect that needs repair unless there were signs of problems, but I would at least report it as a concern. Spaced wood decking/sheathing with asphalt shingles was not common even for a 1960’s home. Also, materials have changed over the years, and applying a newer roofing system over an old deck that doesn’t meet current manufacturer’s and industry standards is not a good idea.
In addition, present day manufacturers of asphalt shingles require a solid wood deck for attachment, and application on older spaced wood decking could void the warranty (see this link for one example … http://www.gaf.com/Content/Documents/20222.pdf). That is exactly why the spaced wood decking on one house rehab project I was involved with got stripped off and replaced with plywood … just too much effort to fill in the gaps to meet the mfr requirements, and ya ended up with partially questionable existing deck areas after all that work.
Hmmm … I was pretty surprised by that comment from you since you are such a big fan of HI’s using the CodeCheck series as a field reference, and since an HI has little to reference besides an SOP and current industry standards (such as the IRC and NEC) which you often quote/reference yourself.
I would then assume you also wouldn’t report on the lack of GFCI receptacles in an old bathroom, or older framing with limited beam bearing or no hurricane/earthquake tie downs in risky areas (like FL) … all of which were acceptable at some time for older homes but wouldn’t meet current construction standards (and for good reason).
Sorry mate, couldn’t resist …