Fiber Cement Siding Shrinking on the Wall 
Not all Fiber Cement Siding is created equal! Only two of the fiber cement manufacturers are known to have this “shrinking” issue. The phenomena of the increase in gaps or the “shrinking” of some manufacturer’s products on the wall after installation is an obvious “curing” after installation. Some manufacturer’s products are unstable. These seem to be the products that are formed in the manufacturing process in a single fill of the slurry and then a “press” leveling system, rather than the build-up process used by other manufacturers.

We can only say that the products that have the gapping problems or curing on the wall, as we call it, have two possible red flag, tell-tale signs of potential problems. Look for either two of these issues and then run away from the product:

1. A single pass “press” system to level off the material in the manufacturing process.

2. Manufacturer will not allow “back-priming” of product, meaning a full bath or total all-side coating is not allowed and will void warranty. (This seems to be a red-flag as the product must be left uncoated on one side to continue curing after being nailed to the wall.)


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