Flue?

[nbhi]

What is the recommended height of the flue coming out of the chimney?
There is a screen over this chimney, for birds.

Attachment 19742

[Brian A. MacNeish]

Originally Posted by nbhi

What is the recommended height of the flue coming out of the chimney?
There is a screen over this chimney, for birds.

Usually 2-4 inches above the chimney cap (crown)

[Jeffrey R. Pope]

Are you referring to the "liner," or an exhaust system of other sorts? That looks like an unlined masonry chimney. Can't really tell from your photo.

[nbhi]

Jeff
Not sure if it is lined. Was unable to see from the roof. Furnace and watertank vent into this.

[Jeffrey R. Pope]

They don't need to extend out of the chimney. . .

[nbhi]

Jeff
Would you recommend rain cap? Brain in post#2 says 2 to 4 inches?

[Jeffrey R. Pope]

I always recommend a rain/weather cap. Even here in sunny CA.

[David C. Macy]

When I encounter a chimney that is not accessible from the roof (Like this one) I take a picture at the access door in the basement. (If there is one and if I can open the door) When I get home I can enlarge the photo to try to determine if there is a flue.

The chimney pictured appears to have been rebuilt at the top. They should of extended the flue so they can install a proper cap.

If higher efficiency appliances are venting up this chimney it will deteriorate again.

This chimney may require a liner & cap depending on what type of furnace is installed. This would be beyond our scope of an inspection.

I just wouldn't want to be responsible if there was an unlined chimney.

[Brian A. MacNeish]

Originally Posted by nbhi

Jeff
Would you recommend rain cap? Brain in post#2 says 2 to 4 inches?

That was for a clay tile flue liner to extend above the crown (called "chimney cap" in Canuck land); a rain cap would be at least 6-10 inches high above the flue top to allow for easy exit of exhaust gases.


Here's a representation of a good masonry chimney:

http://www.maconline.org/tech/constr...y/chimney.html

I noticed this US org was calling the crown a chimney cap also.