(followup question to Why is this Ptrap installed in this location?)
Here is the hole that I want to patch up:
As you can see, it is a cinder block wall with concrete foundation with a new PVC drain pipe. I want to cover the hole to prevent future water damage to the foundation. I also want it to be relatively easy to break the wall again and expose the pipe in case there is a problem with it.
Here is my current plan:
- use a shop vac to drain the leftover water and dirt
- use "great stuff" expanding foam to fill up the left and right blocks
- use the foam to cover the pipes with 1 inch layer
- use mortar type s to fill up the rest – including the bottom block
- wait for it to dry and paint over using the same color
Is this a good plan? are there any mistakes that I need to avoid?
update: a zoom out of the project
Best Answer
You need to make sure that you can have access to the space in case you need to address any issues with the plumbing in the future. ( especially since you have a fernco type rubber fitting installed. )
You should install an outdoor rated access panel that either has a hinged door or a removable panel. Either option will need to have hole for the clean out plug as it stands proud of the wall.
Depending on the size of your opening you may find a metal/plasic access panel in the size you need and then cut a hole in it or you may have to have one manufactured. It should be installed with an outdoor rated sealant or silicone and then screwed to the wall with concrete screws or concrete anchors with the appropriate fasteners.
Spray foam may be OK for the adjacent block cavities but i would not surround the plumbing with any material that can not be removed easily, for any future maintenance, stuff fiberglass insulation all around it so you can pull it out if you need to.