I need to regrade my patio and I had a quick look under the pavers to see how it was built. To my surprise I found the following layers:
- one thin layer off gravel -you would say it is about 1/4in thin
- weed barrier
- 4" crushed limestone
- precast brick pavers
I expected something more like 4" of gravel and 1" of sand + pavers on top (like it is described here : http://www.homedepot.ca/know-how/projects0/laying-out-and-digging-a-patio )
I think that the whole thing is too little permeable to water, and it drains more difficultly and that correlated with a slope toward the house is giving me a wet wall ... I need to raise the level of the patio with 1"-2" in order to make it drain away of the house
Now the question is: do I add sand over the existing limestone crush or I buy more limestone crush ?
From drainage perspective, is it normal to have mostly just this limestone crash layer and nothing else? Will this crushed limestone trap the water longer than it should?