Support under ridge vent?

Roofing/Construction Questions
#1

The top tier of 1/2" plywood will be 8" wide after I cut the slot for the ShingleVent II.

Do I need to add blocking between the rafters for the upper edge of the ply since I’m losing the support of the ridge board?

The roof is 4/12 with rafters 16" OC.

Regards,

Mike

#2

If your ply is 8" wide and your rafters are 16" OC you should be fine without any additional blocking.

#3

But often times the rafters are 24 inches on center with a 3-6 inch strip of 1/2 inch plywood at the top. It seems that no one ever wants to do what it takes to correct the problem which is cut the existing wood 2 ft. down from the ridge and install 2 ft wide and 8 ft. long strips across the length. The roofers don’t want to do the work and the home owners don’t want to pay for it thus a lot of roofs like this end up with little sunken in strips of plywood under the ridge and many times they leak as well.

#4

Alrighty, that’s what I did. It’s actually sturdier now with better nails than it was with the ridge support and wimpy nails.

Thanks for the replies.

Regards,

Mike

#5

[quote=“turbogoat”]

Alrighty, that’s what I did. It’s actually sturdier now with better nails than it was with the ridge support and wimpy nails.

Thanks for the replies.

Regards,

Mike[/quote]

The entire roof deck would probably benefit greatly from re-nailing it.

I end up re-nailing approx 1/2 the roofs I do, it makes a big difference.

#6

Axiom said:

"The entire roof deck would probably benefit greatly from re-nailing it.

I end up re-nailing approx 1/2 the roofs I do, it makes a big difference."

Thanks, I will do that, as much of the decking is only loosely attached to the framework.

Mike