Do You Need A Vapor Barrier Under Lp Siding

A shed without heat and air conditioning does not need to have a moisture barrier as it will cause condensation and mold growth.

Do you need a vapor barrier under lp siding.

The bottom line janice is you need to remove the cement siding and install some sort of house wrap that has the drainage channels. 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. Do i need a vapor barrier in my shed. Third a true vapor barrier is installed on the heated side of the wall studs not under or over the exterior sheathing.

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. The installation instructions explain that smartside is installed with nails or screws not adhesive. Not every wall does. Vinyl siding is one of if not the most popular exterior cladding for residential homes.

Vapor barriers vinyl siding. Sources of leaks into a vinyl sided building. After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one. Housewrap vapor barrier requirements for vinyl siding article contents.

Why do homes need house wrap. 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. 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. The wall cavities and insulation must have a a way to breath.

A wrb is to varying extents a vapor retarder but not a vapor barrier. We also provide a master index to this topic or you can try the page top or bottom search box as a quick way to find information you need. A vapor retarder is a material used to prevent water vapor from diffusing into the wall ceiling or floor during the cold winter. You don t want a vapor barrier in this location.

Wrbs including tyvek are vapor permeable. 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. 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.

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. But this wrb is not a vapor barrier.