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Many of you followed the thread on if a person should tyvex or not under hardie plank. This morning the building offical called with the final answer /statement. If hardie is used over Louisiana Pacific OSB, then LP’s osb is considered a moisture barrier. And the only place you need to put tyvex is at the corners or at plywood breaks that do NOT happen on a stud.
Come on folks lets get real. OSB is not a mositure barrier . So if you said no tyvek needed then you win. But according to the official if you do not you are a cheep builder and he feels we will see problem s with this new ruling
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sorry I also left this out.....this only is for OSB if you use plywood you have to use a moisture barrier such as tyvex.Maybe I should start using more osb in my jobs. Oh well out to the rainy oregon monday morning.
*Josh:Keep in mind that the building official's job is to enforce the code - whatever that may be. Also keep in mind that building codes are a set of b minimum standards designed to protect homeowners and the public at large. Codes are always deficient in some areas. For example, I'll bet that almost no building code requires cement backer board to be installed under ceramic tile. Heck, for that matter, I'm not even sure that our local code requires the outside of the house to be painted - I'll have to look that one up!Re the no rainscreen between OSB and fiber-cement board siding, you/he is right. Most OSB sheathing that I have seen has a smooth side that has some kind of water resistant film - also know as the slick side that you do i not want to install up when you're sheathing a roof - unless you like ice-skating 15, 20, or 35' in the air! Anyway, I'm sure that the framers that built the house in question were very careful to install the slick side out (to the weather) and that there are no cracks in the OSB (joints) where water can get into it. A better question for the building official might have been: "What would you do on i your House?"Another way to think of it is this - go find the oldest house you can that has fiber-cement siding installed. Look around the windows, doors, etc, for places where the caulk has shrunk and small cracks (gaps) have appeared. Now go home, and in an attempt to simulate water leaking through those small gaps for several years, take a scrap of OSB sheathing and put it in a bucket of water out in the backyard. Go back and look at it in about a month.Then let us know if you think house wrap/builders felt is a necessary underpayment under i any type of siding. In the meantime, think about the terms "Fine Homebuilding" and "Reasonable Quality".
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Many of you followed the thread on if a person should tyvex or not under hardie plank. This morning the building offical called with the final answer /statement. If hardie is used over Louisiana Pacific OSB, then LP's osb is considered a moisture barrier. And the only place you need to put tyvex is at the corners or at plywood breaks that do NOT happen on a stud.
Come on folks lets get real. OSB is not a mositure barrier . So if you said no tyvek needed then you win. But according to the official if you do not you are a cheep builder and he feels we will see problem s with this new ruling