Good morning,
Added sewer scope services after taking the InterNACHI course about a year ago. Ground level accessible cleanouts go smoothly.
Going through the 3 inch roof vent is more challenging. **I have trouble always getting the camera to make the turn.Camera head is very flexible but the 3/8 inch pushrod becomes cumbersome as well.
Just looking for any tips from those more experienced on how to consistently make that turn from the roof.
Ben
I know some guys will bring water up with them and pour it in to help lubricate the run.
Me; I only do sewer scopes when I have a proper clean-out access in the basement, crawlspace or the yard, etc. I don’t do roof vent access or pull toilets.
The guys I sub will only do roof scopes on single-story (+ a small crawl most times) since more than that and the camera usually won’t make the turn at the bottom and it’s tough to push out. It’s helpful to have people flushing toilets and running things to help “float” the camera out (and then inspect on the way back - I hope that is how the I-Nachi class teaches it). I’m not up on all the rod diameters but if you have one of the cheaper cameras with flimsy rod you are discovering why the good ones cost more (and are worth it).
Thanks for responding. I appreciate the insight. 
I have 2 scopes a 1/4 inch rod and a 3/8 rod different manufactures. The smaller diameter rod will tend to collapse under tension on the side walls, the larger rod is more consistent but can be cumbersome on a pitched roof. Probably just going through the learning curve. Thanks for your reponse and insights.
The guys we sub use these Rigid cameras but they are expensive (upwards of 10K for a full setup)
I also once bought a (relatively) cheap Scout camera for around $2K at the time. It’s a decent setup but really not going to last in old jagged, beat up lines. It is really best for newer plastic pipes. Thankfully, those have less issues and are generally easier for starting out. Some quick searching didn’t give the rod diameter but if it’s 1/4 and 3/8 I’m pretty sure the Rigid is the larger and pretty stout. From the few times I used the Scout with a smaller line it was quite a noticeable difference.