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well i hate to answer a qestion with a question but, it depends on the block, the wall type etc. but providing that you are laying 8" block with nominal dimesions of 8"x8"x16" and the radius is "soft" meaning a radius where the inner most corner of the block has a 1/16"to an 1/8" morter joint, and the outer moter joint of 3/4" or less. you start from a point designated by a dot on the top of a well driven wooden stake(meaning that the stake won't wiggle ,or foul the line point). after you drive the stake find the point as close as you can so that a set distance from the point on the stake to any points the wall must reach will meet very close, closer the better, but one can make up small inconsistencies with block(important to "lay out" as best as you can, it will make it easier) now drive a small nail into the point on top of the wooden stake, this is the point you will be working from.using a good tape measure plot a radius on the footing or substrate. I like to draw a line on the footer with a fresh black maker( small head). and once one has a good mark spray orange marking paint over the black line. it will increase it's visibility and water proof it some. now, there are two ways to lay the block in radius. option 2 is my choice and is probably easiest. but it incroaches on the line(remember this) 1, have the center of the block touch the line you have marked, making sure that each joint gap is even and consistent. so that the wall will be on the outside of the line. 2, have the left and right edges of the block touch the line making sure that the inside morter joint be kept even. the joint width will be determined by the radius.but be sure to have a joint no less than about an 1/8". Now if for whatever the reason your radius is "tighter" than the block will allow by this method the "lay out" will be the same however every block can have some of the cell either chisseld off, or sawn off with a cut off saw and a diamond blade. how much is once again determined by the radius one is trying to obtain(cut off only what you have to, no more). if you cut the block more than say ,the ear off the block gradually starts losing strength, but a block wall can be filled with a soupy mixture of concrete or morter mix to give it strength. In the event that the radius is extremely tight, there are specialty blocks that you can buy that are more of a diamond shape but in some regions they are harder to get than others. NOTE : don't foget to add reinforcement wire and wall ties if your adding brick to the face. I really hope this was helpful.

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Q: How do you lay a radius in a cinder block wall?
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