Cement Siding Over Existing Hardie Board

0 312 in x 8 25 in x 144 in hardieplank primed woodgrain lap fiber cement siding panel.

Cement siding over existing hardie board.

James hardie fiber cement siding is engineered to stand up beautifully whatever the elements and comes with the option for an authentic woodgrain finish. Left unchecked small issues can become major problems that could end up costing thousands of dollars to rectify. This is the main task to tackle to make sure that there are no preexisting issues on the home. James hardie is the world leader in fiber cement siding and backerboard.

To achieve the look you ll use hardiepanel vertical siding as your base material. The james hardie manual actually agrees that current siding works fine for a substrate but only if it s in acceptable. Why siding over existing siding is a bad move yes you may be able to save some money by not removing the old siding but that old siding could be hiding problems that may bite you down the road. 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.

Number one you can t shoot the hardiplank siding into the voids in your dutch lap siding. We ve been providing a better way to build for over 100 years. James hardie siding is made of cement so it will absorb moisture if it is installed like this. If hardie is installed too close to these surfaces there is a chance that the paint will start to bubble and peel.

That said this is where you want to start when deciding if you should keep it. Without properly inspecting and examining your current siding it s probably hard to tell its actual condition. Imo it would not be a good idea to go over it.