Do You Need A Vapor Barrier Under Lp Siding. 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. After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one. The wall cavities and insulation must have a a way to breath.
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. 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.
Whether or not you need a vapor retarder hinges on three main factors.
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. Third a true vapor barrier is installed on the heated side of the wall studs not under or over the exterior sheathing. Sources of leaks into a vinyl sided building. Do i need a vapor barrier in my shed.
