Housewrap vapor barrier requirements for vinyl siding article contents.
Do you need a vapor barrier under lp siding.
The wall cavities and insulation must have a a way to breath.
Whether or not you need a vapor retarder hinges on three main factors.
According to the installation instructions for smartside siding lp smartside 76 series lap siding may be attached directly to framing members spaced up to a maximum of 24 in 600 mm on center so you don t need any sheathing under the siding.
After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one.
You don t want a vapor barrier in this location.
Vapor barriers vinyl siding.
If you plan to build your shed on a concrete floor a plastic barrier under the slab will prevent moisture from entering through the concrete.
Sources of leaks into a vinyl sided building.
In the end the decision to install house wrap under your siding is a personal one that you should make after discussing it with your contractor.
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If you live in climates zone 5 6 7 or 8 most building codes require a vapor retarder a less stringent barrier than a vapor barrier on the interior side of the wall assembly.
What s more you re in an area of the country where you probably need to put the vapor barrier on the outside of your addition.
A wrb is to varying extents a vapor retarder but not a vapor barrier.
Not every wall does.
Do i need a vapor barrier in my shed.
They will breath and excessive moisture should escape through the exterior siding.
However if you re interested a residing project offers the perfect time to examine your home s weather barrier and exterior insulation and improve it if need be.
Wrbs including tyvek are vapor permeable.
There is no logical reason not to have house wrap under vinyl siding and many authorities strongly agree that it should be viewed as mandatory even if your local building codes don t necessarily require it.
Why do homes need house wrap.
But this wrb is not a vapor barrier.
The installation instructions explain that smartside is installed with nails or screws not adhesive.
Third a true vapor barrier is installed on the heated side of the wall studs not under or over the exterior sheathing.
Vinyl siding is one of if not the most popular exterior cladding for residential homes.
The bottom line janice is you need to remove the cement siding and install some sort of house wrap that has the drainage channels.
A wrb is more of a water and moisture resisting barrier than a vapor resisting barrier and it also serves when installed correctly as a drainage plane for water and moisture get behind the siding as will happen.
