Caulking Cedar Siding Joints

If i am installing a prefinished product which i do mostly i use a color osi match caulk.

Caulking cedar siding joints.

Siding caulk can be used on several different areas of your exterior siding to help prevent water damage and moisture buildup. A lot of moisture from rain snow misdirected sprinklers or exuberant water fights can get in there enough to do some serious and expensive damage. If i install a non finished product i usually go with a 3m paintable 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.

It dries in just an hour and serves for up to 35 years. Generally we do not recommend caulking butt joints on cedar siding. When you try to restrict either it is at your peril. The siding expands and contracts with temperature and humidity.

All butt joints will be flashed. The hole should be about 3 16 of an inch for most caulking joints. Where two pieces of siding meet. Think of a wood home as a living thing.

Butt joints are a perfect example of poor joint design they re too small to accommodate a bond breaker so the caulk can t stretch properly once applied but they re also too large to simply leave alone. Caulk by its adhesive nature will try to limit this movement leading to widespread failure and cracking in the caulk over time. This is a high performance formula that comes in a 10 1 oz bottle. It needs to move and breathe.

I m not a painter but i do install cedar siding and i always caulk all the joints. I am in agreement with martin not to use caulking as it seems to cause more. If you re in the market for the best exterior caulk for cedar siding you will appreciate what the red devil 077010 has to offer. Most other areas were caulk is necessary should be lightly smoothed with your finger.

Caulking on the exterior siding joints at the corner board if done carefully does not need to be smoothed with a finger. The answer depends on the manufacturer and installation method used when the siding was first installed. Butt joints but not all butt joints. I m about to put up siding on a building enclosure that includes a wrb taped xps and furring strips.

The siding will be a combination of lap wood siding front and colorplus hardie plank the rest.