Caulking Fiber 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 fiber cement siding.

We only caulk butt joints on cedar siding if previously caulked. 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. Dap alex plus 12 pack 10 1 oz white paintable latex caulk. Natural siding boards are designed to expand and contract with the elements and we do not want any adhesive to prevent their natural movement.

They re cheaper and easy to install and you can cut the proper size hole in a plastic mounting block with a utility knife or a snips. Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur. Most fiber cement manufacturers make mounting blocks for lights electrical receptacles a c lines pvc venting etc. Item 157140 model 11532.

On our jobs we typically don t leave gaps for caulk at butt joints because this detail can contribute to the problem. Fiber cement boards are caulked only when there is no metal flashing behind them. In my experience water that gets trapped against fiber cement siding can be absorbed by the material causing joints to swell and shrink during freeze thaw cycles. That is why we are showing you some other products for various surfaces along with our top pick.

Big stretch acrylic latex caulking sealant by sashco. Jaime prefers to use the vinyl mounting blocks typically used with vinyl siding. Instead we snug the joints up tight and. Best caulk for fiber cement siding or hardiplank siding lets you have the perfect sealing your surface needs.

A mark parlee a general contractor in des moines iowa responds. Flashing acts as a. 2 house built before 2008 so has no flashing okay to caulk.