Caulking Cement Fiber Siding

We provide a table of all fiber cement siding installation clearance or gap specifications caulking requirements storage or moisture requirements.

Caulking cement fiber siding.

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. That is why we are showing you some other products for various surfaces along with our top pick. 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.

Flashing acts as a waterproofing layer for this type of siding and caulking will prevent the flashing from doing its job. What you want to use is a silicone caulk because it s the most permanent one. 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. Placing caulk over large portions of wood siding prohibits the natural movement of the wooden panels and can cause extensive damage to the exterior of your home.

We organize include fiber cement siding gap repair advice from the manufacturer as well as from builders and building inspectors. Caulk is usually used with fiber cement siding to prevent water intrusion at the butt joints. So what i would tell you to do is to use a colored caulk to choose the caulk in the color of the siding. Butt joints however should be nailed tightly together and should not be caulked.

Fiber cement boards are caulked only when there is no metal flashing behind them. It s got good adhesion and expands and contracts. We only caulk butt joints on cedar siding if previously caulked. Best caulk for fiber cement siding or hardiplank siding lets you have the perfect sealing your surface needs.