What type of door from finished to unfinished area?

Is your water heater electric or gas? If gas, you may need to make sure there is enough air exchange.

I used interior doors

If the unfinished space is heated, you can use an interior door. If it is unheated, you would need either a solid wood interior door, a solid wood with a masonite cover door or an exterior door. All with weather seals.

Scott, if you mean heated as in a duct ran to it, that would be a no... the only heat to the rooms are from equipment in them or heat from other rooms entering from the door opening.


Nick

I too used interior doors into my three unfinished areas. Unless you have significant drafts coming through that area you should be fine.

Nick,


By conditioned space, I mean with the same HVAC service, exterior insulation, etc. as the other spaces you are finishing.


For example, my mechanical room qualifies as conditioned so I could use a regular door, but my shop space isn't so I needed a more substantial door. This is needed for two reasons: fire stop and to stop movement of conditioned air into a "cold" space.


The cheapest solution is often a masonite covered solid door. These are made with this use in mind and have air seals, but aren't true exterior doors. I picked one up from a lumber yard in my area for $29 at their "scratch-n-dent" sale in the fall. It had scuffs on it, but other than one nick, was in perfect condition once painted.