Hi, if its not too silly a question:- I have a garden that falls a little. At the top 1/2 I want to separate the soil borders on either side from the grass with block paving. At the bottom 1/2 I want to level it off, which will mean a small retaining wall 3-4 bricks high. Can I use the same block paving to 'top off' the top of the wall at the bottom ie use as coping? Thanks.