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Question DetailsAsked on 4/10/2016

Should I put Hardie Plank over existing masonite siding?

My house is a manufactured house built in 1995. It has sheet Masonite siding that needs replaced . I would like to just put up Hardie Plank over the Masonite with a water barrier in between. Is this a good idea or no?

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1 Answer


Please, NO ! If you have an opportunity to remove masonite (or OSB or particle board or fiberboard) siding during a residing job, do it and replace it with a proper sheathing - or a sheathing type finish surface. NOt only do those products soak up moisture and hold it, causing both mold/rot and disintegration of the product, but masonite and hardboard also act as a pretty effective vapor barrier except at the edges, trapping moisture in the walls when they are cold.

Here are a couple of similar previous questions with responses on that subject too -

Answered 4 years ago by LCD

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