Newbie question - installing a flange in basement rough-in
Got a real newbie question. I'm in the final stages of finishing my basement and am turning my attention to the bathroom. Our house is about 6 years old and we had the builder rough-in a 1/2 bath for us (so venting and stub are already present).
I have the closet flange just about ready to go in, but I'm getting cold feet before I start cutting and cementing, and would appreciate a "sanity check" from you before I go any further.
A little background... the stub is PVC and extends about 6 - 8 inches above the concrete floor. I have purchased one of those flanges with the movable ring around it (two "sliding" slots and four holes around the ring). Further, I'll be installing a laminate flooring that's about 9mm in thickness.
My plan:
Step 1. Drill holes into the concrete and insert tap-cons as the bolts.
Step 2. Using a special flexible saw, trim the stub so it's level with the flooring.
Step 3. Lay down the laminate flooring and trim it so that it butts up close to the stub (drilling holes for the tap-con bolts through the laminate boards).
Step 4. Cement the flange to the now-cut stub.
Step 5. Follow the rest of the toilet installation steps (install wax ring, level toilet, et al).
Now, my questions:
Q1. I think I have to trim down the tap-cons so that I am just able to tighten a nut down onto the flange ring. Is that a correct assumption?
Q2. As I have four holes in the flange ring, do I need to drill/put in four tap-cons, or are the two I'm planning on enough?
Q3. When I'm setting the closet flange, will the ring sit on top of the laminate flooring, or do I want them level (or as level as I can make it since the width of the ring is not quite the same as the flooring)?
Q4. Assuming Q2 has the ring on top, can/should the laminate go right up to the stub? Is there any reason why it shouldn't?
I think that's it. If anyone has any other thoughts or warnings, they'd be appreciated. Otherwise, keep your fingers crossed for me.
Thanks!