Caulking Cedar Siding Joints

Where two pieces of siding meet.

Caulking cedar siding joints.

Caulk by its adhesive nature will try to limit this movement leading to widespread failure and cracking in the caulk over time. The siding will be a combination of lap wood siding front and colorplus hardie plank the rest. Caulking on the exterior siding joints at the corner board if done carefully does not need to be smoothed with a finger. If i am installing a prefinished product which i do mostly i use a color osi match caulk.

Should they always be caulked. My question is limited to the seams in which the siding contacts vertical trim. All butt joints will be flashed. The answer depends on the manufacturer and installation method used when the siding was first installed.

Some of the most commonly caulked areas of siding include both corners and crevices as well as some butt joints and window and door trim boards. Think of a wood home as a living thing. Natural siding boards are designed to expand and contract with the elements and we do not want any adhesive to prevent their natural movement. If i install a non finished product i usually go with a 3m paintable caulk.

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. Siding caulk can be used on several different areas of your exterior siding to help prevent water damage and moisture buildup. I m not a painter but i do install cedar siding and i always caulk all the joints. This is a high performance formula that comes in a 10 1 oz bottle.

The siding expands and contracts with temperature and humidity. 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. The hole should be about 3 16 of an inch for most caulking joints. I m about to put up siding on a building enclosure that includes a wrb taped xps and furring strips.

I am in agreement with martin not to use caulking as it seems to cause more. It dries in just an hour and serves for up to 35 years. Most other areas were caulk is necessary should be lightly smoothed with your finger. Generally we do not recommend caulking butt joints on cedar siding.

Butt joints but not all butt joints.