Hot Water Vent
Your water heater vent should be b-vent (double wall pipe) which requires 1" separation from combustibles. Single wall pipe (c-vent) requires 6" separation, but can only be used as a vent connector, and some inspectors won't allow it at all. Turn off your water heater until you have it properly vented out the roof, as venting to an attic can cause down drafting of the exhaust, where Carbon Monoxide (CO) can enter your living space. There are different manufacturers of b vent, and they aren't always able to be connected together, so make sure you buy the same brand, or one that is compatible. You'll also need an approved termination, which has to be above the roof a certain distance, and to size it properly. If you need help sizing it, just ask. Sometimes the supplier will help you with this.
Edit: the above poster suggested you hire a pro to do this, and I completely agree. But, seeing as this is a DIY site, I'd rather help you avoid potentially life threatening mistakes if you decide to do it yourself. This is a task that could be harmful to you and others.
Last edited by hvac benny; 11-06-2012 at 10:25 PM.