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Fiber cement siding defects, failures, problem troubleshooting: this article describes the types of problems that occur in fiber cement siding installations in North America, including siding shrinkage gaps at butt joints, cracks, breaks, and loose or buckling siding boards or shakes. Also see SIDING, FIBER CEMENT GAPS where we discuss fiber cement siding gaps, clearances, butt joint specifications and sealing and caulking specifications.
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Fiber Cement Lap Siding Board Installation SNAFUs: end gaps, loose siding, crooked, curved, bent siding, missing flashing, trim rot, building leaks, you name it.
Gaps at butt joints in fiber cement siding as well as questions about where caulk should and should not be applied are discussed separately at SIDING, FIBER CEMENT GAPS.
As you can see in our fiber cement lap siding butt joint gap photo at left, the gap is unattractive; in this installation we see the housewrap in the siding gap opening - telling us that there was no back-flashing and that wind-blown rain will certainly pass behind the siding at rates above usual - possibly leading to leaks into the building walls.
Other fiber cement installation & maintenance problems are described in the remainder of this article. .
But whose fiber cement siding is this?
Installed in 2003 the siding has been "repaired" (caulked butt joints) at least once, with gaps continuing to open, leading to a very unhappy homeowner.
Our second siding gap photo (below left) tells more about the history of this fiber cement siding installation.
Counterfeit "brand name" Fiber Cement Siding?
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