Last weekend I replaced the two van-air roof vents and the central roof vent. The van-airs were installed in the kitchen and bathroom. They were just 32+ years old and had disintegrated. They did still work, but not well.
The good news is that the replacements were $45/ea on eBay.
I used a ladder to get up on the roof and there are a couple of photos of what I was replacing.
The central vent was a strange / obsolete vent. I replaced it with a Fantastic Vent with a thermostat and a rain sensor. This required a small enlargement to the hole. I was nervous about the enlargement because there was structural framing on one side. I consulted the parts manual and realized it was okay to modify. The “skeleton” section from here.
I had to take the vent apart in order to trace it’s outline on the roof.
It also involved taking the vent apart in order to trace it’s outline. It’s sealed with a good heavy duty sealant, OSI Quad. I believe this is a one part polyurethane rubber, but Henkel doesn’t say. I know it’s the best stuff to use on Hardie Siding and it has a 25% stretch rating. A bus is hardly hardie siding, but it is a tough thing to seal up. I’m happy with the results and it did not leak when it rained recently.
I picked up the Fantastic vent on eBay as an open box return. It was in perfect condition. $300 vent obtained for $120 including shipping. 🙂