Caulking Cement Fiber Siding

Fiber cement boards don t expand and contract much but leave a little room for expansion at the end joints and then fill the gap with caulk.

Caulking cement fiber siding.

We provide a table of all fiber cement siding installation clearance or gap specifications caulking requirements storage or moisture requirements. It s got good adhesion and expands and contracts. We only caulk butt joints on cedar siding if previously caulked. But you are correct that it is very difficult to paint.

Butt joints however should be nailed tightly together and should not be caulked. That is why we are showing you some other products for various surfaces along with our top pick. Best caulk for fiber cement siding or hardiplank siding lets you have the perfect sealing your surface needs. Caulk is usually used with fiber cement siding to prevent water intrusion at the butt joints.

We organize include fiber cement siding gap repair advice from the manufacturer as well as from builders and building inspectors. Fiber cement boards are caulked only when there is no metal flashing behind them. Natural siding boards are designed to expand and contract with the elements and we do not want any adhesive to prevent their natural movement. So what i would tell you to do is to use a colored caulk to choose the caulk in the color of the siding.

Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur. When james hardie siding products butt into wood based materials a 1 8 gap will allow for expansion and contraction of the wood based product. However this detail may not be effective at sealing the ends allowing water to be absorbed and swell the board ends. Many professionals like those at james hardie also agree that you should not use caulk on fiber cement siding unless there is no metal flashing underneath.