New Slab Adjoining Block Wall with Footer
I am pouring a new slab, 6″ thick, to extend a concrete slab walkway on the side of my house all the way to a block wall on the perimeter of the house. New slab is approx 4′ wide and 10′ long. I am planning to join to the existing walkway slab with epoxied rebar dowels and match the current expansion joint of the existing walkway. As for the other side of the new slab that butts up against the cocrete block wall, I have read on the forum that I should use asphalt spacers against the wall. My question is the wall has a 12″ wide on each side concrete footer that is about 6″ below grade. Should I asphalt spacer the horizontal surface of the footer as well to isolate the new slab from the wall structure completely, or in this scenario am I better just doweling into the footer and the concrete wall and solidify the new slab to the structures on both side. The wall extends past the new slab on both sides by dozens of feet, (only widening the walkway in a 10′ long section). As a result, I would think it would be best to isolate the new slab from the wall, but how do I achieve this on both the vertical and the horizontal surface? Tar Paper on top of a thin layer of gravel on the horizontal footer surface maybe?
Any help would be appreciated. Thanks