For regular hardiplank lap siding the kind you paint after installation caulking at butt joints is optional.
Caulking siding joints.
It has a grainy texture and appearance.
Should they always be caulked.
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Sometimes the old caulk in the siding joint is cracked and you need to cut the old caulk out with a razor knife.
Unsanded caulk has a smooth appearance and texture.
Use sanded caulk any time you use sanded grout and in joints 1 8 inch or wider.
This from installation instructions.
For best results use caulks that comply with either astm c 834 or astm c 920.
Trim boards wood windows.
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.
Where two pieces of siding meet.
Moisture can still seep in at butt joints the places where the ends of two pieces of siding meet and where siding meets trim.
Sanded caulk has particles in it that help it adhere to wet surfaces and expand in larger gaps without cracking.
This is a must do for all houses.
Caulking your home s siding is a simple process but not necessarily a foolproof one.
Butt joints but not all butt joints.
Caulk can be either sanded or unsanded.
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Another critical place is where the siding butts together in the middle of the wall.
152 4 mm wide 1 in.
James hardie also does not recommend applying caulk to the horizontal overlap between siding planks see figure 2.
When to use caulk on exterior siding siding caulk can be used on several different areas of your exterior siding to help prevent water damage and moisture buildup.
25 4 mm on overlap no caulk figure 1.
Those joints need to be protected somehow.
This allows for the caulk to get in and fill the gap correctly.
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Joint flashing butt joint horizontal lap treatment june 2014 james hardie does not recommend caulking butt joints or the horizontal overlaps joint flashing 6 in.
To avoid leakage these seams should be sealed with caulk.
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Moisture likes to hide in corners edges and under ledges.
A high quality paintable caulk is recommended.
There s no way around regular maintenance of those siding butt joints unless you want to completely remove the siding and install joint flashing.
