Installing Hardiplank Siding Over Existing Siding

Using existing siding for replacing siding the best place to start is to closely examine the existing siding to get a good understanding of what condition it is actually in.

Installing hardiplank siding over existing siding.

If hardie is installed too close to these surfaces there is a chance that the paint will start to bubble and peel. If the wood siding is beveled or lapped you. James hardie siding is made of cement so it will absorb moisture if it is installed like this. Without properly inspecting and examining your current siding it s probably hard to tell its actual condition.

Does this mean that hardieplank cannot be installed directly over existing wood siding without voiding the warranty. Several contractors have suggested that the wood siding need not be removed. The hardie website is unclear on this issue. Find a local contractor.

Thank you for any information. According to the best practices manual from james hardie existing siding can be used as a substrate as long as it is in good condition meaning that it is not warped bowed curling delaminated or rotting. The first course of any wall should be installed over a 1 4 lath strip to ensure a consistent plank angle see figure 1. Optionally install the lap siding with a maximum 1 8 gap and caulk the joint see detail at right.

This would be on an older house but the wood siding is in good condition. Even though most reputable contractors will never install siding over existing siding there are knuckleheads out there that will say you can do it and it s not a problem. Vinyl siding must be installed against a flat surface. Now you probably want to know just how you re supposed to decide.

Why siding over existing siding is a bad move. The best way to get the performance you expect from your james hardie products is to work with a professional contractor. It s recommended whether you choose new osb or your current siding if it s in good shape and installed to the studs. Keeping your existing siding.