Caulking Siding Joints

Caulking your home s siding is a simple process but not necessarily a foolproof one.

Caulking siding joints. Sanded caulk has particles in it that help it adhere to wet surfaces and expand in larger gaps without cracking. 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. Those joints need to be protected somehow. For best results use caulks that comply with either astm c 834 or astm c 920.

Use sanded caulk any time you use sanded grout and in joints 1 8 inch or wider. 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. Dap dynaflex 230 10 1 oz. Where two pieces of siding meet.

Sometimes the old caulk in the siding joint is cracked and you need to cut the old caulk out with a razor knife. Caulk can be either sanded or unsanded. Moisture can still seep in at butt joints the places where the ends of two pieces of siding meet and where siding meets trim. James hardie also does not recommend applying caulk to the horizontal overlap between siding planks see figure 2.

Should they always be caulked. Sashco 46090 10 5 oz. Being in operation since the 1870s red devil is a brand with a remarkable experience. This is a must do for all houses.

25 4 mm on overlap no caulk figure 1. Butt joints but not all butt joints. Red devil 077010 acrylic latex sealant cedar 10 1 oz. This from installation instructions.

Unsanded caulk has a smooth appearance and texture. What must be caulked caulking corners. If the siding joint is so tight that the caulk only bridges the gap it may split again. 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.

Moisture likes to hide in corners edges and under ledges. It has a grainy texture and appearance. To avoid leakage these seams should be sealed with caulk. Trim boards wood windows.

Dap cedar acrylic latex caulk with silicone. These siding joints can be caulked successfully if the gap is wide enough for the caulk to get into the crack. This allows for the caulk to get in and fill the gap correctly. For regular hardiplank lap siding the kind you paint after installation caulking at butt joints is optional.

Top 5 best caulk for cedar siding in 2020. A high quality paintable caulk is recommended.