B-vent Installation for Dummies: The Easiest Way to Do It Yourself!
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- Опубликовано: 22 окт 2023
- How to Install B-Vent
Most B-type (double wall) vents require one inch, but always follow what the manufacturer indicates This information is usually embossed or labeled on the vent/product.
Only two bends are permitted and tape is prohibited in some states.
It's good practice to check with your local building department to see if permits are required. This will ensure one's safety and also protect one's investment when it's time to file an insurance claim.
Flashing a Roofing B vent Flue Pipe on a metal roof using a high-temperature boot, Sashco Through The Roof Sealant. Learn the basics with Ron King, The Ultimate DIYer.
Tape was used along with very small 1/4 inch screws to insure other contractors did not hit the pipe and dislodge it because it was in a walkway.
The tape will be removed after construction ends. Note that some jurisdictions do not allow tape or screws. Screws are okay here. The 1/4 inch screws do not penetrate the second aluminum skin.
How high should Type B vents be above roof?
All metal vents must terminate at least 2 feet above the roof surface.
How much clearance is needed for B vent pipe?
Type B Gas Vent require a minimum of one-inch clearance to combustibles.
This one-inch is a typical clearance for all brands of Type B Vent, but each section of vent pipe is marked with the clearance required by Underwriter Laboratories, so it should be checked.
Do you put screws in B vent?
It is acceptable to use screws to attach the B-Vent to the appliance outlet and some counties will allow small screws in the pipe as long as to doesn't penetrate the inner wall.
What is the minimum B vent slope?
¼ inch per foot minimum pitch is required to vent horizontally. No downward dips or sags
Can you install B vent through wall?
The Wall Thimble is used where a Type B Gas Vent passes through a vertical wall. The Wall Thimble will provide for the proper clearance to combustible material as the vent passes through the wall, and will act as a firestop.
Single wall flue pipe may also be referred to as single skin, vitreous enamel or connecting flue pipe.
Type C vents are used only as connectors in most cases. They are often called “galvanized pipes”, used only for venting gas or oil.
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Parts used:
4" Gas Termination Kit amzn.to/41bmLFq
Duravent 4-Inch Adjustable 90 Degree Type B Gas Vent Elbow amzn.to/4aaXBL0
Chimney 4 in. x 36 in. Type B Gas Vent amzn.to/4a68M7Y
100-Feet Roll Galvanized Hanger Tape: amzn.to/3GzKpC5
Buck Professional Grade Aluminum Foil Tape - amzn.to/47XaKG0
Sashco Through The Roof Sealant, 10.5 oz Cartridge, Clear (Pack of 3) amzn.to/3NbsgxV
10.5 oz Sashco 14010 Clear Through the Roof! Sealant Pack of 12 amzn.to/3Tbldcw
Through The Roof! Black 10.5 oz (Pack of 1) amzn.to/3NfZsES
Through The Roof! White 10.5 oz (Pack of 1) amzn.to/3RvQDZW
Tools used:
Spyder 13 Piece Bi Metal Steel Hole Cutter Saw Kit with Blades and Arbors amzn.to/4ako9tE
3 Piece Aviation Tin Snips amzn.to/3TbZYHu
DEWALT TAPE 25FT amzn.to/46KQTc0
MILWAUKEE 25Ft Compact Magnetic Tape amzn.to/41b7aWi
MALCO 4-inch 1/4-inch and 5/16-inch Hex Driver (1-Pack) amzn.to/4a7nY4I
Caulk Gun, 9 Inch Silicone Sealant Caulk Gun for Caulking
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Thank you for watching!
#ronking #handyman #diy #plumbing #hvac #roofing #furnaces #bpipe 
Хобби
Very nice to see you doing this on a steel roof rather than shingle. Thank you!
You are welcome, I looked and couldn’t find many videos showing a metal roof. Thanks for the comment and thank you for watching.
Awesome video TY. I have a Slant Finn on demand hot water boiler and would like to Horizontally vent it with the B vent as is code here in NY but am un sure what to do once I'm outside the wall on the side of the house, If I need to go up a certain length or just terminate with a T screen end. I'm a trucker but am very handy from videos like yours. ty J.R.
My dad was a Teamster truck driver. So much respect, and thank you for watching my channel. I would use something like this because of the extreme heat it will send out the side of your home. Remember to keep the piping away from anything flammable as it exits.
But if you are dealing with an inspector, he may require a special termination method he wants you to use.
Horizontal Square Termination Cap-4" x 6 5/8" Direct Vent, 4" x 6.625"
amzn.to/3U0C0Qa
Question: I need to vent a wood stove thru a 4/12 gable roof. Better to install stack before or after the roof is shingled? TIA.
If you have the option, I think it’s always best to have the stack there as the shingles are being put on rather than trying to cut it later.
@@UltimateDiyer appreciate the reply.
I wish more RUclips knowledge sources were like your videos. Another great one.
Question: Are there Type B ducts (8”) that are made similar to the 90 degree articulating type?
Also, does a gas rangetop require a Type B (dual wall pipe) for exhaust to your knowledge ? I can not locate this information in the code reference book
Gas ranges actually at the moment do not require any venting, but that does not mean you shouldn’t put one in. All you really need is the single wall, smooth duct, and be sure that you seal all of the joints. The exhaust only requires a regular duct because you do not have extreme heat flowing through it. As to the vent termination area, it always has to be a B vent type as well because it has to be far away from flammable materials like the plywood roofing, note the termination has to be way above your roof.
Yes they do make the 8” B vent articulating, elbows. I did find this one in a 7” amzn.to/48hTI5T, if you follow the link and look at the pictures, they show they go all the way to a 10 inch. But it looks like they are not very cheap.
Thank you for the comments and all the questions and I really do appreciate you watching.
@@UltimateDiyer Thank you. As always one question spurs on another. I am intending to vent (8” all the way through the roof) even though not required. However in doing so, am I now in need of the Type B products? I think you are saying ‘yes’ due to the flammability issue with ‘low heat’ exhaust from a gas range hood. Is this correct?
As far as termination beyond the roof. I do recall in the beginning of the video the 2’ above the roof for 9/12 pitch and lower. Is that required for an ‘optional’ venting system in the first place or only intended for true ‘type B’ appliances (ie Furnace)?
I would think you would want to install the vent in the middle of the ridge so that rain water can get around the boot. If you install it in the valley how does the water drain?
Installing on the ridge is actually a little harder to seal because of all the contours that you have to seal around. It’s really more luck as to where it’s going to come out, you could pre-drill a hole from the roof and then try to work your way over to that but it becomes a little harder to do when dealing with double walled b vent. But with the whole even in the center valley, the water still runs around it, you just have to make sure that it is sealed well.
Through The Roof sealant is amazing. Thank you for your comment
It is much easier to seal an opening on a shingled roof.
great video! we are installing a new furnace at a cabin. the old kerosene furnace used a 6 inch flue pipe. The new propane furnace calls for 4 inch B vent pipe. Could we run the 4 inch pipe up through the existing 6 inch pipe which would eliminate a lot of work?!!.
I don’t see why not, as long as you can keep the b vent centered so it is 2 inches away from the anything flammable. If the 6 inch pipe is not double walled and touching flammables that is. Thank you for watching and thank you for the comments.
Good morning, I am also changing my furnace too , one question, the pipe does not go in the direction of the arrow or does that not matter? Thanks have a good day.
That's very interesting I didn't even pay attention to the little arrows because the pipes can only
connect one way. I think the arrow is showing the side that you must connect/push down on as you assemble the piping. Awesome question. Thank you for the question and for watching.
@@UltimateDiyer You want the lap on the inside going in the direction of flow. If it's exhaust lap goes on the inside of next connection. If it's a return line you want the opposite.
Looking to do this myself. Have you had any leaks? I have a metal roof as well.
No I have had 0 leaks, just be sure to use a lot of through the roof sealant, I build a large dam all the way around.
What are some options for venting through and old brick stack? I woul like to run a line though the chimney to the roof can i use b vent for that?
You would need to get with your building inspector to assess the condition of the chimney and determine if it meets current building codes. It may be possible but every area has its own codes and requirements for things like that. Thank you for the question, and thanks for watching.
If you want to put the b vent inside the chimney and not terminate to the chimney I don’t see why you couldn’t do that, the only real issue I see would be holding the pipe in place. You would need to have a way to attach it at the end of the stack where it exits the chimney. Remember it has to be nonflammable.
It has an old vent pipe going through it already I was just wanting to replace the old corroded galvanized steel with b-vent. It will terminate at the top of the chimney not inside of the chimney. Also I appreciate all of the useful knowledge in this video for future projects.
I changed my gas furnace to electric. Can I use the old exhaust for the ventilation of the bathroom in my attic, if so how can I do it without touching the part on the roof?
Can I cut it or are there replacement parts?
It is a B-vent 6' what i have
THANKS
I assume your question is, can you use the old B vent hole to be able to vent your bathroom ventilation? The answer is yes you can, you can use the old pipe and cut it and use regular HVAC ductwork to connect to it or you can take the entire vent stack out and replace it with one on the roof that is made for bathroom venting, which would be my suggestion.
Both methods, though, would use HVAC flex duct to carry the bathrooms exhaust to the roof, you can use single wall vent pipe, but flex works much better
@@UltimateDiyer Flex is easier to install. It's def not better.
Once the pipe is joined/can it be disconnected from ea.other?
From my roof to the inside it needs replaced
Yes they pull apart
I beat the elbow off with a hammer/never could turn either.
Thanks
Hot in my attic today!
Do not put tape on your B-Vent double wall. DON"T DO IT.
Hey Jimmy, why don’t you put tape on. Is it a hazard of some kind? Thanks for watching and the comment.
@@UltimateDiyer The glue on the tape melts off and it's useless. Also the glue is toxic. As you mentioned it's not necessary. You can use it on a cold system I/E Forced air Heat A/C However IMO it's a hack way of installing duct. Better off to use a proper duct seal. Now on the double wall as you explained in your video once it's locked it's locked. A few zip screws Would be as far as I go if needed and then if you feel it's not sealed use a high temp caulk around the connections. 35 years as Union Tinknocker If I was to use tape on my connections I would get laughed off the job. Nothing better than a nice clean install. Plumb level hangers etc etc. DIYers are gonna do what they are gonna do to save money. However you can still take pride in your install. Also look at the tape around the connections It looks like Dog !@#$. LOL.