BRycraft
New Member
I have been reading a lot of the Q&A on this forum, looking thru plumbing and building codes trying to educate myself, and have a dilemma that I have not been able to find an answer for. Currently I am moving a kitchen sink about 7 feet to center under a window thats about 72" wide. I am going to place a kitchen island where the sink currently is and put in a small bar sink since the drain and supply are already there. I live on a slab and have to break up the concrete to run the drain and supply lines. My question comes in the installation of the vent. This obviously is an outside wall the vent pipe is entering which is under a window. I want to slope the vent up and to the side of the window and up thru a bay between king studs into the top plate into the attic. I have read about drilling a hole 40% the width of the stud but if there are 2 king studs you can drill up to 60% Since these are 2x4 seems a 2" line would not be to code since that exceeds the 40% rule, these studs have previously been notched for conduit to pass thru, so first can you even bore holes and also have notches as well within a short distance from each other?... I will install shoe plates, strapping whatever would be required. The drain is going to be 2" and would rather have a 2" vent because up the wall and over to where the current vent line is located is about 16' away not including the distance of pipe going into attic 8' foot ceiling, maybe 28 feet total run. Would 1 1/2" be ok or would 2" be better?, this is a farm sink and a dishwasher connected to this one drain and thats it beside further down the line will be the bar sink that will use the existing plumbing already in place..
Ok my real dilemma is because this is a large 3 lite slider window whoever built the house installed 3 king studs adjacent to the window with a cripple stud before the kind stud so essentially 4 studs together, and the next framing king stud is only 6" on center. I have read you can only drill thru 2 king studs to get the 60% allotment of hole size, so am I out of luck because of the 3rd king stud? even though there is another king stud 6" away? I want to run the vent in that narrow bay up into the attic. Seems a 3rd kind stud would be stronger then 2 and drilling a 2" hole would be 57%. Problem is I cannot get shoe plates for 4 studs and if they make them for 3 studs I can remove that cripple stud install a shoe plate and reinstall it back in place.
So is this more a building code issue? I have seen where someone piped around the outside of the king studs like a curve in a roundabout. This shouldn't be a problem because a dishwasher will be positioned right in front of these studs and there is enough room for the pipes without hitting the dishwasher.
I like doing things right and since I have had 2 plumbers here telling me 2 different things contradictory things, I prefer to find the right way and do it myself and save a boatload of money..
Whats are my options and what would be the best way? Can I even drill thru the studs that are already notched? Can I notch them myself the 25% just to recess the pipes somewhat? The drain will be coming out the floor and will install a cleanout as well, then run the vent into the back wall thru the cripple studs. I have read that its always best to slope the vent pipe upward, so I was thinking sloping the pipe upward to the side of the window and up the bay.. Next part of my question is the top plate, sandwiched 2x4 and I read that 40% rule applies but does the 60% rule apply since there are 2 top plates? I would rather not plumb out and around them into the ceiling because it will be visible, unless I move over another bay where it will be hidden by cabinets but thats drilling thru another king stud.. Can I drill thru the king studs and top plate and reduce the pipe to 1 1/2" thru those boards and go back to 2" for the runs, even at 1 1/2" it exceeds the 40%, how else do they manage to run pipe thru structure if most of the sizing exceeds the value allowed by code?
Also this is a single family home, single level so no upper level to deal with.
Currently the vent stack where its located is servicing a washing machine and the kitchen sink in its current location. The vent pipe is only 1 1/2" for the washing machine and the kitchen sink is 2", so the 1 1/2" pipe increases to 2" for the kitchen sink and then it increases to 3" going thru the roof, thats the current configuration. I figure to tie into that 2" pipe, however this probably won't fly but to save some time and working in a very hot attic would be a plus. I have a high efficiency furnace that is vented to the outside wall which would be about 10 feet above the window but is turned down with a 90 elbow and is a few feet from the soffit. I assume tying into the vent is prohibited? Just wondering.. Included photo of desired run of vent and current vent.
Or should I simply increase the vent to 3" in the attic and have it exit the roof the minimum 6"is that even allowable? Also one 1 other vent in home on other side of house for bathroom.
If I did use stud shoes do they allow for pipe on an angle?
Once I solve this problem I will be back with some other questions regarding the PEX I want to install for the supply lines...
Thanks for any help Bill
Ok my real dilemma is because this is a large 3 lite slider window whoever built the house installed 3 king studs adjacent to the window with a cripple stud before the kind stud so essentially 4 studs together, and the next framing king stud is only 6" on center. I have read you can only drill thru 2 king studs to get the 60% allotment of hole size, so am I out of luck because of the 3rd king stud? even though there is another king stud 6" away? I want to run the vent in that narrow bay up into the attic. Seems a 3rd kind stud would be stronger then 2 and drilling a 2" hole would be 57%. Problem is I cannot get shoe plates for 4 studs and if they make them for 3 studs I can remove that cripple stud install a shoe plate and reinstall it back in place.
So is this more a building code issue? I have seen where someone piped around the outside of the king studs like a curve in a roundabout. This shouldn't be a problem because a dishwasher will be positioned right in front of these studs and there is enough room for the pipes without hitting the dishwasher.
I like doing things right and since I have had 2 plumbers here telling me 2 different things contradictory things, I prefer to find the right way and do it myself and save a boatload of money..
Whats are my options and what would be the best way? Can I even drill thru the studs that are already notched? Can I notch them myself the 25% just to recess the pipes somewhat? The drain will be coming out the floor and will install a cleanout as well, then run the vent into the back wall thru the cripple studs. I have read that its always best to slope the vent pipe upward, so I was thinking sloping the pipe upward to the side of the window and up the bay.. Next part of my question is the top plate, sandwiched 2x4 and I read that 40% rule applies but does the 60% rule apply since there are 2 top plates? I would rather not plumb out and around them into the ceiling because it will be visible, unless I move over another bay where it will be hidden by cabinets but thats drilling thru another king stud.. Can I drill thru the king studs and top plate and reduce the pipe to 1 1/2" thru those boards and go back to 2" for the runs, even at 1 1/2" it exceeds the 40%, how else do they manage to run pipe thru structure if most of the sizing exceeds the value allowed by code?
Also this is a single family home, single level so no upper level to deal with.
Currently the vent stack where its located is servicing a washing machine and the kitchen sink in its current location. The vent pipe is only 1 1/2" for the washing machine and the kitchen sink is 2", so the 1 1/2" pipe increases to 2" for the kitchen sink and then it increases to 3" going thru the roof, thats the current configuration. I figure to tie into that 2" pipe, however this probably won't fly but to save some time and working in a very hot attic would be a plus. I have a high efficiency furnace that is vented to the outside wall which would be about 10 feet above the window but is turned down with a 90 elbow and is a few feet from the soffit. I assume tying into the vent is prohibited? Just wondering.. Included photo of desired run of vent and current vent.
Or should I simply increase the vent to 3" in the attic and have it exit the roof the minimum 6"is that even allowable? Also one 1 other vent in home on other side of house for bathroom.
If I did use stud shoes do they allow for pipe on an angle?
Once I solve this problem I will be back with some other questions regarding the PEX I want to install for the supply lines...
Thanks for any help Bill