Can Hardiplank Be Installed Over Existing Siding

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Can hardiplank be installed over existing siding. Number one you can t shoot the hardiplank siding into the voids in your dutch lap siding. More than 50 years. Hardie plank joints butt joints james hardie siding is 12 feet long which means that siding on your longer walls will need to join together. The actual question is should the current siding be removed with osb installed or should the current siding remain to act as a substrate an additional layer beneath the top layer under the new hardieplank 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. Liquid nails is not a bonding mortar. Installing siding over existing stucco does not give us a chance to identify underlying rot issues so if you have any concerns a full removal could be your best bet. Why siding over existing siding is a bad move.

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. Where hardiebacker board is being installed over a code complying subfloor for the attachment of tile the board is installed over a 3 32 1 4 thick bed of bonding mortar and then nailed down. 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. Number two even if you tried to match the exposure of the existing siding let s say the dutch siding is 5 on center and you picked 6 1 4 hardi that would also have a 5 exposure so that you would always be nailing.

Something you will want to keep in mind when making this decision is how long hardieplank will be on your home. And if a board does get wet but is not sitting in moisture for an extended period of time you can simply let it dry out before installing. Installing vinyl over wood siding does require considerable. Imo it would not be a good idea to go over it.