Question on garage siding.

[1967coronet]

My 24x24 detached at our home has the original 12" masonite siding with the 4x8 sheets of black board under.
Areas around the brick mold are getting soft and flaking,
Bottom pieces have some rot in places.
Our house has vinyl siding and I want to use the same on the garage.
I figure I can not put vinyl over the masonite.
Can I though sheet over it with 7/16 OSB then wrap and side it or does all the masonite have to come off ?

 

[demonram]

My 24x24 detached at our home has the original 12" masonite siding with the 4x8 sheets of black board under.
Areas around the brick mold are getting soft and flaking,
Bottom pieces have some rot in places.
Our house has vinyl siding and I want to use the same on the garage.
I figure I can not put vinyl over the masonite.
Can I though sheet over it with 7/16 OSB then wrap and side it or does all the masonite have to come off ?

Honestly, I would take the Masonite off, check for any damage to the Celotex, wrap it with Tyvek, then side it. The problem with Masonite is, if it hasn’t been properly maintained, it will hold moisture. They also had bad batches through the years that delaminated, again being able to hold moisture. It’s best to basically start from scratch to eliminate any existing or future moisture/mold/rot issues. Take care.

 

[1967coronet]

Honestly, I would take the Masonite off, check for any damage to the Celotex, wrap it with Tyvek, then side it. The problem with Masonite is, if it hasn’t been properly maintained, it will hold moisture. They also had bad batches through the years that delaminated, again being able to hold moisture. It’s best to basically start from scratch to eliminate any existing or future moisture/mold/rot issues. Take care.

Thanks, Yes I'm sure there is some moisture in the bad areas of the masonite.
Makes sense to remove it all. I'm just getting lazy lol.

 

[demonram]

Thanks, Yes I'm sure there is some moisture in the bad areas of the masonite.
Makes sense to remove it all. I'm just getting lazy lol.

I have sided over it many times. They make a folding 1/4” insulation board to help flatten the surface. In your case with the known moisture issue, it’s just better to play it safe. It will peel like a banana once you start, the problem is, getting rid of it.

 

[SlingLow]

The landfills are getting picky about what they will accept. Around here, sheetrock is a big deal. They require you to have it tested by a lab, and if there is any asbestos (almost always on older textured rock), they want it double bagged in 6 mil bags, then taken to a special facility at a much higher cost. When I gutted my sunroom last summer, I just bagged all the sheetrock in contractor bags and put 1 bag a week in my garbage for streetside collection. 40 weeks later (just a couple weeks ago) it was gone. Anything with the possibility of asbestos is subject to examination and testing. Masonite does not contain asbestos.