T@B 400 bathroom folding sink removal; add panels and shelf

Just thought I would share this modification, which was prompted by the drain in our round folding sink pulling away from the corrugated drain tubing, never to be seen again. Thinking we needed to repair it I looked for options but when I mentioned those to the wife she said "We barely use that sink as it is. Can we get rid of it?". So after seeing some other conversions to wall mount sinks or to just a bare panel, I decided to try for a panel with a small shelf beneath that might be useful. I will walk thru the removal and the installation. I like to see the insides and behinds of stuff, so apologize for the multiple views.

The folding sink has two long screws near the middle and 6 smaller screws around the edges and comes off pretty easily. The plumbing shown below was connected to sink via hand tightened sink risers for 1/2 inch supply lines and attached to the sink with a PEX fitting. The drain (which was pretty slow as many know) is attached to the corrugated drain via a 3/4 inch  T connector. One comes  from the sink basin and the other from the cistern basin behind and below the sink. So now that its out of the way, things are pretty easy to see.



First step in the remodel was determining secure plywood mounts. The cabinets above are 1/2 inch plywood  and the wall to L is 3/4 inch plywood. The plywood mount mid way down for the vent plumbing is also 3/4 inch and is secured to wall on L and a plastic composite board on R. The wall behind is the Azdel exterior wall.





There are two large vent pipes, one from black tank on R and one from grey tank on L and they combine and exit up a chase to the roof. The hose lines here are the black tank flush system, which flows up through a check valve and then  back down to spray in the black tank. Seems to work fine and no issues.



Oh and you need to plug the corrugated drain to grey tank and both the hot and cold inlets to the old sink. They are 1/2 inch PEX NPT connectors. That is about all the plumbing I could handle. And don't forget to pressure test before you cover up the wall!


I used a 1 inch by 3/4 inch block 25 inches long under the upper cabinet as a point to secure the panels at the top (shown below) . The plywood was what I had available and so there are 2 panels with a vertical seam. You will likely want to use a single piece of plywood. I had a leftover piece of furniture grade here and if birch plywood sheets ever drop in price I can easily swap this out. I used #8 pocket screws 1" and 1 1/14" depending on thickness and they work very well.





The next photo below shows a practice fitting of  the support for the shelf, which is 4 3/4 inches deep and supported by this partial box that is 8 1/4 inches high and rests on the plastic tank cover shown. The shelf overhangs about an inch.  Will place blocks to secure to make this easy to remove for access.



So here is what the construction of the partial box and shelf looks like. Just simple joinery with some easing of the areas the bath is not quite even. Not too much for a novice.



So this is what it will look like in the bath. Will put urethane sealer and caulk the joints. I noted I now have a place to sit something down when on the throne. We are deciding on towel racks for the panel and still considering.





The ideas for this came from several upgrades on the forum. An outstanding one was done by @Kevin@7 who installed a wall sink and replumbed the 3/4 corrugated drain system. Well beyond my ability but I liked the shelf idea and just made it lower. @Tabfortwo did a similar install with a wall sink that was also replumbed and looked great. And @jimcenname who uses his T@B400 all the time provided the impetus to just get rid of the sink and put in a panel, where we can put towel rods or whatever. @Denny16 helped as well with his assurance that he has never needed his sink and had it delivered without one in the bathroom. He also posted pictures behind the sink to assure me there were not too many scary things back there for me to break.

Any ideas for towel rods or other accessories that might work on the the panel?  Here is one we are considering:



Hope this helps someone and thanks all

QH