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See attached layout. A local plumber recommended venting this kitchen sink with an AAV (Air Admittance Valve), but I am not that familiar with these devices. I was going to tie it into the main stack vent to only have a single cutout in the roof, but this has a long up and down path thru the...

What is the best option for insulating a ceiling with scissor trusses that are 2x4 /24" on center construction? New build in Michigan, so planning on R-38 or better. Option 1 is single layer R-38 faced fiberglass insulation batts, Option 2 is two layers with R-13 faced to fit in the 2x4...

Is venting up then down in the attic to get to main vent stack acceptable? Vent line would be 2" and main vent stack can support these additional fixtures.

Are the vent lines questioned in the picture necessary? Was thinking that these fixtures are all vented thru the main stack or wet vented from other fixtures.

Never posted anything to this forum, but used it a lot to get some great information from it! Question at hand, is this bathroom waste drain/vent layout ok with a single vent in a basement bathroom? Toilet and Tub are wet vented to the vanity vent. Picture is attached, it is a new build and...