How To Install Vapor Barrier On Ceiling
Look over the ceiling joists before installing your moisture barrier.
How to install vapor barrier on ceiling. There are different thicknesses of poly that can be bought at your local building supply stores on various sized rolls but there is one thing that a vapour barrier grade poly needs and that is to be approved for use as a vapour barrier. This youtube channel was designed to help homeowners tackle. Remove any nails screws staples or large splinters on the joist face where the vapor barrier attaches. This tops anything i have seen in 25 years of roofing duration.
The moisture in the attic is probably coming from all the leaks through the ceiling. Tape it down to prevent moisture from migrating around the edges. Always refer to current local code recommendations when deciding if and how to install vapor barriers. In canada it should be cgsb.
You cant just install plastic in a ceiling and assume it is also an air barrier. To do the best job you should clear away the existing insulation and install the vapor barrier so that both the ceiling and joists are covered. If you use a non approved poly it does not last and will deteriorate over time and crumble leaving you unprotected. Fiberglass does not stop air movement.
Go to your home improvement. For plastic to be an air barrier it needs to be continuous meaning all joints and penetrations must be taped or caulked. Learn the easiest way to seal up an old house from drafts and keep your renovation from having moisture problems with a vapor barrier. For example the recommended vapor barrier in a home or office in a humid southern climate built with brick varies greatly from creating a vapor barrier in a cold climate in a home built with wood siding.
Vapour barrier poly installation steps. West coast roofer roofing and roof repair 3281482 views. A vapor barrier probably wont help. If your attic is adequately ventilated it isnt necessary to go the these extremes your idea would be fine.
I spray the underside of the roof deck and make the attic semi conditioned space. On the other hand an air barrier a properly detailed air tight drywall ceiling for example in the absence of a vapor barrier can be effective since it stops the flow of vapor laden air.
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