Porch roofs and roofs over additions---venting adequacy

 Generally speaking, the bulk of at least the older homes have porches and home additions with roofs that are not vented properly.  But what is "properly"?  
 A porch roof built against the house may be properly flashed, shingled etc and then have vented soffit on porch ceiling, but nowhere for the heat to draw through/out.    Often there is no ridge for a ridge vent.   Any general thoughts out there? Thanks.

Maybe gable vents, roof box vents or the newer vents against the top wall would help you.




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I guess I should have looked first. I didn’t know about the vented wall vents, perfect solution. Case closed, thanks.

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You’re welcome, Kevin!