Roof vents/pipes

[Mischelle Hamilton]

One of the tell-tale signs that a home is manufactured seems to be the extrordinary height of the vent and flu pipes on the roof. Are there any guidlines if a person wanted to shorten the height of these to more closely resemble a stick built home?

[Tom]

Vent pipe sizes are set by local, state and federal code. You would need to know that information before any alterations can be done(If any). Tom

[Mark Bower]

I would have to disagree that the high vent pipes is a tell-tale sign of a mobile home. Some vent pipes barely stick above the roof.

High pipes are better than low pipes because they work better. Sometimes low pipes will get a backdraft down them and you end up smelling sewer gas inside the home.

You want your pipes to stick above the highest point of your home (normally the peak of the roof). Anything lower and you risk your pipes not working as good as they should.

Mark

[Tracy]

If you look around at other manufactured homes you will soon realize you have many different lengths. Its almost like the person cutting them off in each plant gets to decide how far off the finished roof they will be exposed. I do agree with vents being above the roof line, but if your vent is on the exterior wall and your roof is a 5/12 or even worse 6/12 pitch, you have a lot of exposed pipe!

I would say that in order for a drain pipe to work correctly, you should keep it up high enough not to become blocked in heavy snow, and not to short that you end up smelling sewer gas from downdraft winds.

DWV is easy to raise, just purchase a coupler, glue and same size pipe and go with whatever you feel doesnt become a eyesore.

A quick call to your local building inspector might not hurt just to see if they have local requirements on your issue as well..

-Tracy

[Eugene]

OK, if the pipe is a DWV vent pipe, the HUD code requires that they are 2" above the roof deck.
If it is a fireplace flue, they must be 3' above the roof where it passes and 2' higher than anything within 10'.
If it is a furnace, the fuel gas code wants the air intake to be 12' above the decking.

[Mark]

A waste vent is fine being short, but you usually want a woodburning fireplaces chimmey top to be above the roofs ridge line to prevent wind from blowing down the chimmey, and to keep the smoke from 'hugging' the roof.

[Univa]

My home is over a hundred years old. The chimney has a wide cracked at the bottom near the roof and is crumbling within. I had a liner put in. The chimney is extremely long and is leaning at an angle. I have no fireplace, just a gas furnance and water heater. I was told the damage was due to natural detereation and poorly constructed. It will eventually fall.

My question is: when I have it torn down, do I have to have it rebuilt as high as it is since I have no fireplace ? I have a vent on the new roof. What is the cost of this tpye of work ?



Univa

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[Univa]

My home is over a hundred years old. The chimney has a wide crack at the bottom near the roof and is crumbling within. I had a liner put in. The chimney is extremely long and is leaning at an angle. I have no fireplace, just a gas furnance and water heater. I was told the damage was due to age and poor construction and that It will eventually fall.

My question is: When I do have it torn down, does it have to be rebuilt as high as it is, as I have no fireplace? I have a vent on the new roof. What is the cost of this tpye of work?



Univa

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