siding & insulation over masonite

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  #1  
Old 01-31-06, 06:21 PM
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Question siding & insulation over masonite

I am planning to vinyl side a 70's house w/ masonite siding w/ 1/2" vertical furring strips on 16" centers. My plan is this:

- add some additional vertical and horizontal strips to better support the insulation and siding
- install 1/2" foam insulation over the furring strips to give it an additional insulating airspace
- cover w/ Tyvek wrap
- add siding

One concern I have is wavy siding. Am I better off removing the furring strips and securing the insulation directly to the masonite and giving up the airspace?

Any other recommendations?
 
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Old 01-31-06, 07:56 PM
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If you are concerned about wavy siding, you should remove the masonite and get back to something that is perfectly flat- your sheathing. Every layer you apply has the potential to add "waves" to the surface. You could then skip the furring and install the foam.
 
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Old 02-01-06, 03:47 AM
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Agree. You are covering up the Masonite for a reason, and Masonite has a propensity for bulging, waving, etc. Offing the Masonite is the best bet in order to get a good lay of the new siding. Besides, after you add furring, insulation and siding, your house will be 2 or 3 inches wider, and you will have to deal with extending windows and doors to the new siding depth.
 
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Old 02-01-06, 06:00 AM
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Good points - had not considered that! Back to the drawing board!

Thanks, guys.
 
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Old 02-01-06, 06:19 AM
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Also, you do not cover foam insulation with Tyvek.

You use one or the other, not both.
 
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Old 02-01-06, 06:23 AM
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You can use both, most people would just consider it overkill. Unless you are installing new windows on top of the tyvek, though, adding tyvek would make no sense if you didn't seal the edges around window openings.

If you don't use building paper over the foam, you will have to be sure that you use methods to ensure that the foam itself is a "weather resistive barrier". Since vinyl siding allows water to penetrate it, if you don't exercise care when installing the foam, you could have a few locations where leaks could present a problem. Water cannot evaporate once it gets behind foam, because it's a vapor barrier.
 
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Old 03-02-06, 06:33 PM
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mtujohn - the above relies all made valid reasons for removing the masonite, but there is one more important reason. Masonite (hardboard) siding has a nasty habit of getting wet and acting like a sponge. Then the sheathing and perhaps framing may get wet and start to rot. So if you remove the siding you should carefully inspect what is underneath for potential damage. That is the time to find other damage - not after you have resided. You may have to also remove foam,tyvek, or building paper for inspection. An added task and cost but well worth it. Good lucK!
 
 

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