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FAST CHIMNEYS - Finish your roof tops
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Measure the tube you will be using. My 5/16" (.312x.312) tube measures out to 2ft 3inches in HO scale.
Because I'm using a square, I will need four strips of brick material the same width. If you are working with a rectangle then two strips will need to be wider than the others. The strips will need to be slightly wider than the tube. I cut mine almost 3 feet wide so there will be plenty of excess for illustration purposes.

There must be some extra width because a final trimming is needed to help hide the corner joints. 

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