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<blockquote data-quote="eyexer" data-source="post: 244565" data-attributes="member: 315">where is the exterior wall?&nbsp; behind the vanity?- - - Updated - - -I'm gonna go with the notion that the outside wall is behind the vanity.&nbsp; You can vent up outside walls that isn't a problem.&nbsp; You only need a 2&quot; vertical vent for that situation.&nbsp; I'll draw up a picture and attach a picture of how to do it.&nbsp; I'm assuming you have 2x6&quot; exterior wall framing?&nbsp; So just run a 2&quot; vent line somewhere between the two sinks and down into the basement and tie into the sewer line.&nbsp; Just install a 2&quot; cross into that vent line at 18&quot; center up from the floor.&nbsp; Then run an 1-1/2&quot; line out to each sink with a 90' coming out of the wall.&nbsp; Then install an 1-1/4&quot; compression coming out of the wall for the sink drains to attach to.&nbsp; This isn't considered horizontal venting the horizontal runs are drain lines.&nbsp; Then just run that 2&quot; out the stack.&nbsp; As far as insulation goes I would install 2&quot; foam in the bays where the vent lines run.&nbsp; Then you can install fiberglass over the foam between the pvc pipes.&nbsp; Nothing will really freeze in there anyway because water doesn't sit in these lines it drains out too fast.&nbsp; I've done many this way over the years.&nbsp; That all being said, how you have yours drawn up would certainly work if that's easier for you to do as long as the far left drain isn't too far away from the vent stack.&nbsp; The code/rule regarding that is you can have a drain line 48 times the diameter of the pipe in distance from the stack.&nbsp; So a 2&quot; line is 48x2=96 so 96&quot; from main stack.&nbsp; Can't imagine yours would be that far away.&nbsp; All bathroom sink drain tail pieces are 1-1/4&quot; so you just need to have an 1-1/4 compression at end of pipe to connect sink draining too.&nbsp; You can run 1-1/4, 1-1/2 or 2&quot; piping for your vertical runs to your sinks in your drawing.&nbsp; I'd run 1-1/2 myself.- - - Updated - - -[ATTACH]31404[/ATTACH]</blockquote>

[QUOTE="eyexer, post: 244565, member: 315"] where is the exterior wall? behind the vanity? [COLOR=silver][SIZE=1]- - - Updated - - -[/SIZE][/COLOR] I'm gonna go with the notion that the outside wall is behind the vanity. You can vent up outside walls that isn't a problem. You only need a 2" vertical vent for that situation. I'll draw up a picture and attach a picture of how to do it. I'm assuming you have 2x6" exterior wall framing? So just run a 2" vent line somewhere between the two sinks and down into the basement and tie into the sewer line. Just install a 2" cross into that vent line at 18" center up from the floor. Then run an 1-1/2" line out to each sink with a 90' coming out of the wall. Then install an 1-1/4" compression coming out of the wall for the sink drains to attach to. This isn't considered horizontal venting the horizontal runs are drain lines. Then just run that 2" out the stack. As far as insulation goes I would install 2" foam in the bays where the vent lines run. Then you can install fiberglass over the foam between the pvc pipes. Nothing will really freeze in there anyway because water doesn't sit in these lines it drains out too fast. I've done many this way over the years. That all being said, how you have yours drawn up would certainly work if that's easier for you to do as long as the far left drain isn't too far away from the vent stack. The code/rule regarding that is you can have a drain line 48 times the diameter of the pipe in distance from the stack. So a 2" line is 48x2=96 so 96" from main stack. Can't imagine yours would be that far away. All bathroom sink drain tail pieces are 1-1/4" so you just need to have an 1-1/4 compression at end of pipe to connect sink draining too. You can run 1-1/4, 1-1/2 or 2" piping for your vertical runs to your sinks in your drawing. I'd run 1-1/2 myself. [COLOR=silver][SIZE=1]- - - Updated - - -[/SIZE][/COLOR] [ATTACH=CONFIG]31404._xfImport[/ATTACH] [/QUOTE]

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