Hardi has about 30% cellulose fiber in it and the rest is cement. Hardi shrinks after it is installed so you must keep it tight to the the next board and not leave expansion gaps on either side. It de ... read more
Hello Geoff,
In fear of giving you information that is obvious or that you already know, we move forward boldly and answer this question. I had a similar addition on a previous home and it was diffic ... read more