Stack vent

stack vent

[′stak ‚vent]
(engineering)
An extension to the atmosphere of a waste stack or a soil stack above the highest horizontal branch drain or fixture branch that is connected to the stack. Also known as soil vent; waste vent.

Stack vent

Extension of a waste or soil stack above the highest horizontal drain which is connected to the stack.

stack vent

stack vent, 1
1. The extension (to the open air) of a soil or waste stack above the highest horizontal branch drain or fixture branch connected to the stack. Also called a soil vent or waste vent.
2. In built-up roofing systems, a vertical outlet permitting water vapor, which is entrapped within the insulation, to escape.
References in periodicals archive ?
Comment from a reader: In response to a reader who had a problem about his stack vent freezing in cold weather, which negatively affected the functioning of his plumbing, I received the following:
A trick I tried many years ago: I attached a 90-degree elbow to the pipe (the stack vent above the roof) to prevent not only freeze-ups, but the down drafting of vent odors.
legally dispose of all debris; replace all rotted/deteriorated sheathing to match existing dimensionally; replace the existing stack vent with pvc extending it 2~above the roof, size to meet code; provide and install a waterproof membrane - 2 courses along the fascia, 1 course along the gable ends, in all valleys and around roof penetrations.
Depending on the situation, the vent pipe may tie into the stack vent above the second-floor fixtures, or it may go directly up through the roof itself.
Perhaps a toilet has been added in the attic, draining into the stack vent and clogging the vent of fixtures below.
Vertically Parted Molds - parting line vent off casting, stack vent off casting, stack vent off core.
A system of windows located in high and low positions on the exterior walls facilitates natural cross breezes, while stack vents ensure airflow to interior wards.
Such venting can be accomplished in several ways, including stem vents (body vents), parting line vents and stack vents (Fig.