Installing Hardiplank Siding Over Existing Siding

This would be on an older house but the wood siding is in good condition.

Installing hardiplank siding over existing siding.

Without properly inspecting and examining your current siding it s probably hard to tell its actual condition. James hardie siding is made of cement so it will absorb moisture if it is installed like this. Vinyl siding must be installed against a flat surface. The first course of any wall should be installed over a 1 4 lath strip to ensure a consistent plank angle see figure 1.

Why siding over existing siding is a bad move. Existing wood siding must be in good shape with no rot or mold and fastened tightly to the wall. The best way to get the performance you expect from your james hardie products is to work with a professional contractor. Install hardiplank siding with joints butted in moderate contact.

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. 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. Thank you for any information.

Does this mean that hardieplank cannot be installed directly over existing wood siding without voiding the warranty. Installing vinyl siding over wood siding wood must be sound. Find a local contractor. 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.

Now you probably want to know just how you re supposed to decide. The hardie website is unclear on this issue. 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. Keeping your existing siding.