Caulking Cement Siding

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.

Caulking cement siding.

Flashing acts as a waterproofing layer for this type of siding and caulking will prevent the flashing from doing its job. Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur. 1 i chose this caulk because it has 25 flexibility compared to silicone based caulk. Caulk is usually used with fiber cement siding to prevent water intrusion at the butt joints.

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. It is never acceptable to leave a gap of any size at a butt end joint. Ge silicone 1 10 1 oz clear silicone caulk. Best caulk for fiber cement siding or hardiplank siding lets you have the perfect sealing your surface needs.

It s got good adhesion and expands and contracts. For pricing and availability. Bottom of siding boards should not be caulked. Big stretch acrylic latex caulking sealant by sashco.

2 house built before 2008 so has no flashing okay to caulk. What you want to use is a silicone caulk because it s the most permanent one. But you are correct that it is very difficult to paint. That is why we are showing you some other products for various surfaces along with our top pick.

However this detail may not be effective at sealing the ends allowing water to be absorbed and swell the board ends. 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. James hardie believes it is good building practice to seal the joints to prevent moisture such as wind driven rain and snow from penetrating the wall cavity. While paint does tend to somewhat glue these pieces together caulking them is never advised and can cause permanent damage.

For pricing and availability. Siding caulk. Ge silicone 2 10 1 oz clear silicone caulk. Butt end joints should be installed with factory sealed or factory prefinished ends butted together in moderate contact.

Water is meant to exit through the bottom of each board.