After I got the fireplace set, I needed to think about the concrete patio slab. I started out by running conduit from one of the basement tunnels to the future grill area for propane, water and power. Then I installed expansion material. The pitches are tricky out there and the foam is great for showing the finishers where grade is.
Even though the sub grade is protected from water and well drained, I don't want the soils under the slab to freeze and heave so I installed rigid insulation. The adjacent walls already have insulation on them.
I plan on covering the patio slab with the same limestone I used inside so I installed a 15 mil vapor barrier so moisture from below won't interfere with bond. Overkill? Who me??
If you are going to do it, you might as well do it right. You can see the taped seams and edges so the vapor barrier membrane is complete. You'll also see the start of my over-engineered reinforcing scheme.
Since my limestone will run from the patio slab out over the wall, I don't want any movement that could crack the stone. Sooo, #4's drilled and epoxied at 9" o.c. at the perimeter and 18" o.c. throughout the slab. Yup. that oughta do it!
Anybody remember when we placed the wall on the left way back when? I mentioned at the time that the plan was to add a concrete seat on top.
Well now was as good a time as any so I formed it right up.
I took advantage of a little step in the wall to support some plywood braces. You can also see a little trench drain I installed to pick up rain water. The patio pitches away from the house about 3/16" per foot.
The slab and drain also pitch about the 3/16" per foot down the length of the patio towards a little planter on the end so if the drain plugs (or freezes) up the water will still have a place to go.
After the formwork was done,I drilled and epoxied some bars into the wall and ran some longitudinal bars.
You might also remember the little curved retaining wall we placed in front of the garage.
After I placed this wall, we started using a new cap detail. I always wanted to go back and add this cap to the curved wall. If you recall, all the walls will eventually get a stone veneer up to the cap
While we were placing concrete, I figured it would be a good chance to add the cap. So I formed it up and installed some bars to keep it in place.
We were finally ready to place some concrete.
As I mentioned grades and pitches were tricky. I needed pitch where I'd get rain but wanted the concrete flat in the areas under roof.
Also got the cap placed
When we were all done, the concrete got a nice moist cure under some curing fabric.
Once I got it all stripped, I had my seat wall. I put some pitch on the top so I wouldn't have standing water.
I wanted the outside of the seat to mimic the cap on the retaining walls.
The cap on the wall came out pretty good and finally matches the other walls
Every time I think I'm done placing concrete I come up with more ideas. I'm beginning to think I may have a problem. In any case, there is more concrete to come down the road.