Any alternatives to running vents through the roof
user-389891
| Posted in Construction Techniques on
I have a new construction cabins in the San Bernardino Mtns. near Lake Arrowhead. Roof is two story (with loft). Sinks are on opposite house ends so apparently I have to run two separate vents. Anyway to avoid doing this? That being said, if I do have to run vents can the beams be notched out and covered with a plate instead of being drilled through?
Replies
Rule of thumb: Do not notch beams - Corollary is: NEVER Notch Glulam or engineered Beams!. Google 'notching and drilling beams' to see what is appropriate and what isn't. Just remember its the top & bottom and either end of the beam that is doing the work and any interruption of those edges shrink the effective size of the beam.
If you can get the proper slope to your vent pipes, 1/4":12" typical, you can make them meet in the middle and penetrate the roof once.
Putting them through the roof will be the easiest and least expensive solution.
Typically, you'll need to run at least one vent up through the roof. Do your DFU calcs and see how much of a vent stack you'll need. Typically it's going to be a 3" vent. As long as you've got an open attic and not cathedral ceilings through the whole place you can tie in the vent from the sink/toilet/tub/whatever on the other side of the cabin to the main stack vent so you only have one vent penetrating the roof. Try and put this on the back of the house so you don't have to look at it!
If it really is just a sink on the other side of the cabin and not a whole bathroom, you might be able to use an AAV (air admittance valve) in the sink cabinet instead of running a vent there. Check with your local inspector first! They don't all allow it and there can be some additional rules for the height and location of the AAV.
Studor vent (AAV) is the answer...do check codes, as they vary from state to state and county to county, but that’s the easiest solution for new sink venting without tearing into a wall...at least, that’s the route I’ve gone a few times here in Washington state...how else would you vent an island or peninsula sink???
Yep. But to answer your question of the peninsula sink, you can go wet vent or do one of those loopy runs.
Not familiar with the term “wet vent” but, a “loopy run” sounds like a high loop...can create vacuum/drainage issues and is typically used in lieu of an air gap for dishwasher, in my experience at least
30 years no problem use with a loop vent servicing kitchen sink and dishwasher. Inspected and approved.