The most commonly thought of way to use hardie board, is as a siding. However hardie has many other uses for its materials. When installing tile on a peer and beam home you would use an underlayment known as Hardie Backer. I have heard it called so many different terms, some of which are: Hardie Backer Board, Fiber cement, Fiber Cement Board, Hardie Fiber Cement Board and so on…. You can call it what you want, and you can just about spell it how you want. Hardi, Hardee, Hardy I think most people will know what you are talking about.
When using a hardie backer board to install tile over it is important to have a good foundation to go over. This usually means at least a 3/4 inch ply wood sub floor. One thing that you would not want to do when installing Hardie board as your subfloor is, to go directly over studs. Hardy board is not strong enough by itself to support that amount of weight.
When installing Hardie backer over an existing subfloor to install tile over, it is very important that you use a multipurpose thin set. It is very helpful to make your measurements for your cuts, then dry them, If in fact they do fit than what you would want to do is use a 3/8 inch notched trowel, to spread down a layer of thin set. While the headset is wet place the Hardie backer into place, then using special Hardie backer screws, screw the Hardie backer to the sub floor placing screws every 8 inches. After the thin set dry’s underneath your Hardie backer, your floor will be solid as a rock.
Before installing your tile, you will need to float in tape your seams. A fiberglass mesh tape works well, along with then set as your float. After this dries you are ready to install your tile.
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