Tying in drain connections and venting for new basement bath

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Cee&MM

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Hello,
Adding a half bath at the basement level is long overdue. We are uncertain we're on the right path so would appreciate review of our plan.

Goals: venting for the new basement toilet and vanity plus proper waste connections into the nearby 4†vertical drain.

This is a single story house plus basement with the building drains under the basement slab. Just above the proposed basement bath is an existing half bath. A vertical 4†drain comes thru the basement ceiling and straight into the basement floor. The same pipe extends thru the roof. Kitchen/laundry/full bath are not an issue as they connect into 2 separate vertical drain stacks.

Please see diagram of proposed showing the vertical 4" drain located in the right corner of the new half bath. Toilet and vanity actually sit at 90 degrees to each other; the diagram is showing a flattened view.

Hoping to avoid cutting the basement slab, we have settled on a wall-hung Toto Aquia toilet and Geberit wall-hung carrier. This toilet will sit centered approximately 26-30†left of the 4" vertical. Placement of the double vanity puts its trap about 4' to the right of the 4" vertical.

Questions: it ok to sanitary tee a 2" output from the lavatories’ shared trap straight into the 4†vertical just above a similar tee connecting to the 3†output from the wall-hung toilet? We'd be using 4" sanitary tees with 3" and 2" inputs.

Looks like the vanity will need a studor vent (42†high) with louvered cover. Will the toilet need its own studor?? Running new vent pipe up thru the main floor, although desirable, would mean tearing into perfect plaster and solid wood paneling.

Any guidance on the preferred method to hook in the studor vents would be helpful. Looks like a cleanout should also be added into the 4" vertical.

We are committed do it yourselfers with more time than money and would appreciate any advice you can give us.
 

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