Caulking Lap Siding

In this instructional video we demonstrate how to use proper caulk techniques on lp smartside products pre finished with diamond kote which recommends dap.

Caulking lap siding.

It needs to move and breathe. Caulking your home s siding is a simple process but not necessarily a foolproof one. Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur. When deciding how to use caulk on your siding however it is generally more important to consider where you should not use it.

When you try to restrict either it is at your peril. 25 4 mm on overlap no caulk figure 1. How to caulk the window trim on lap siding. Similar to paint previous coats of.

And many homeowners over caulk applying caulk where it doesn t belong and potentially compromising the performance of their siding. Caulk is by necessity a sticky gooey substance and as such it smudges easily. Think of a wood home as a living thing. When james hardie siding products butt into wood based materials a 1 8 gap will allow for expansion and contraction of the wood based product.

Is the old caulking removed before new coats are applied. A diyer or a novice painter might attempt to achieve a cleaner look by caulking the siding nails but the nail is guaranteed to push the caulking material out within a few months. 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. Caulk by its adhesive nature will try to limit this movement leading to widespread failure and cracking in the caulk over time.

Whether you are repainting replacing a window or replacing the siding on your house the caulking around the window trim is a very important element. James hardie also does not recommend applying caulk to the horizontal overlap between siding planks see figure 2. The nails holding up the siding should not be caulked. The siding expands and contracts with temperature and humidity.