On the rubber ring that wraps around the PVC you can if you'd like to. The flashing itself says 'no caulk' along the bottom edge meaning you don't need it. As long as its a tight fit and no gaps are left between the two you should be fine. One thing to keep in mind is that if you decide to seal that area I noticed some people like to use Polyurethane based seal on the ring I wouldn't use this type of seal in that area. I've notice that Polyurethane deteriorates the rubber prematurely, I would recommend you use your regular rubber roof cement or a clear silicon. Polyurethane is a great seal but only for metal to metal flashings or metal to concrete. Great question glad we could help! Stay tuned, before the weekend is over we will be uploading another How to roofing video (How-to remove a satellite dish off your Roof)
Clearest, simplest video I've seen on installing roof pipe boots. Thanks!
Is sealant needed where the top of the boot meets the vent pipe? Is the rubber there a good enough seal?
On the rubber ring that wraps around the PVC you can if you'd like to. The flashing itself says 'no caulk' along the bottom edge meaning you don't need it. As long as its a tight fit and no gaps are left between the two you should be fine. One thing to keep in mind is that if you decide to seal that area I noticed some people like to use Polyurethane based seal on the ring I wouldn't use this type of seal in that area. I've notice that Polyurethane deteriorates the rubber prematurely, I would recommend you use your regular rubber roof cement or a clear silicon. Polyurethane is a great seal but only for metal to metal flashings or metal to concrete. Great question glad we could help! Stay tuned, before the weekend is over we will be uploading another How to roofing video (How-to remove a satellite dish off your Roof)