Water heater venting: flexible b-vent?

[DeltaDave]

I'm in CA. I bought my house a while back. I have been examining different items in my house to make sure they meet code. My water heater is inside the house and has a b-vent attached to the WH hood and it goes through the ceiling into the attic. The b-vent extends about 1' 6" above the ceiling in the attic and is not near any combustibles. Then someone attached a 5' flexible b-vent and it turns up with two bends (no greater than a 45 bend) up through the roof jack. It is all locked together. I have been looking and looking for CA code on proper WH venting. Does it meet code to have flexible b-vent in the attic from the double wall b-vent and going through the roof or should be only be double wall b-vent all the way? I don't want to have any potential fire hazard in my attic. Thanks in advance!

 

[Master Plumber Mark]

it has probably been that way for decades... and most likely it passed inspection
long ago.. the only way you would ever have a problem is if someone were to
do something foolish like throwing some boxes or the imitation family x-mas tree up in the
attic and lean it or pile it up against and around that flu pipe.... I have seen that before...
As long as you use common sense and have good clearance around it its probably
nothing to worry or fret over....

of course its wise to keep everything away from any kind of metal flu pipes
in attics

 

[Sponsor]

 

[Dj2]

Can you post pictures of the vents from the top of the water heater to the ceiling, in the attic and on top of the roof?

Pictures are needed for an accurate opinion.

 

[DeltaDave]

It's empty attic area, there's no storage available in that area and nothing combustible near it. I read it must have b-vent through ceilings, etc. (it does) but I assume flex pipe must have been ok at the time because it's not a storage area and there's nothing around it. But I am curious, does the current CA code require double wall from WH hood through the roof?

 

[Master Plumber Mark]

if it is all locked together fittings then it mos likely is double wall fittings
and its probably attached to a double wall vent going out the roof...

I dont think I have ever seen a single wall chimmney