Caulking Between Wood Siding

Seal a door frame in place and seal the subfloor at the bottom of a door frame.

Caulking between wood siding.

The siding expands and contracts with temperature and humidity. In fact some manufacturers warranties are void if you do. Caulking on the exterior siding joints at the corner board if done carefully does not need to be smoothed with a finger. In my opinion caulking between the seams in any lapped siding either horizontal or vertical is not good practice but not just because of any potential vapor barrier effect.

Sometimes known as acrylic latex caulk. Think of a wood home as a living thing. Use latex painter s caulk inside of doors and windows or to quickly fill cracks. Caulking them is a mistake and the caulking is likely to fail prematurely.

Fill in gaps between crown moulding and baseboards. It needs to move and breathe. Flashing acts as a waterproofing layer for this type of siding and caulking will prevent the flashing from doing its job. The hole should be about 3 16 of an inch for most caulking joints.

Matt is 100 correct. 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. You never ever caulk the underside of lap siding. Best for use with drywall wood and masonry.

Bottom of siding boards should not be caulked water is meant to exit through the bottom of each board. 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.