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