I have an interior attic wall moisture problem.

<p>Thermo-Ply should never be placed on the exterior side of fiberglass or similar insulation, because it traps moisture. &nbsp;Even with a well ventilated attic, moisture will form. &nbsp;Products like thermo ply can trap moisture. &nbsp;Following questions:</p> <p>1. &nbsp;Why do you need the thermo-ply? &nbsp;If installed correctly, standard insulation should be sufficient.</p> <p>2. If installed, thermoply should be flush against the attic side of the wall, with unfaced &nbsp;fiberglass insulation placed on the attic facing side of the foam board.</p> <p>Remove the thermo ply since it was installed incorrectly. If it has moisture stains, throw it away (mold can build up on it). &nbsp;If you feel that you need more protection from heat on this wall, do the following:</p> <p>seal all air penetrations on the attic side of wall (drywall seams, electrical and plumbing &nbsp;holes in drywall, etc) to prevent hot air from crossing the drywall. &nbsp;</p> <p>ensure that the fiberglass batts were installed correctly. &nbsp; Batts should fully encapsulate the opening between the studs. &nbsp;If you are not proficient with insualtion, hire an insualtion contractor to remove the foam board and examine the batt insulation. &nbsp;If the batts have become wet, they will need to be replaced. &nbsp;Ask the contractor what he feels the best insulation options are. &nbsp;Fiberglass, rock wool and other base products can be blown into bags which (blown in bags) provide more R value and more thorough coverage in the wall cavity. &nbsp;</p> <p>In any case, this will not be a costly project. &nbsp;</p>

<p>Thermo-Ply should never be placed on the exterior side of fiberglass or similar insulation, because it traps moisture. &nbsp;Even with a well ventilated attic, moisture will form. &nbsp;Products like thermo ply can trap moisture. &nbsp;Following questions:</p> <p>1. &nbsp;Why do you need the thermo-ply? &nbsp;If installed correctly, standard insulation should be sufficient.</p> <p>2. If installed, thermoply should be flush against the attic side of the wall, with unfaced &nbsp;fiberglass insulation placed on the attic facing side of the foam board.</p> <p>Remove the thermo ply since it was installed incorrectly. If it has moisture stains, throw it away (mold can build up on it). &nbsp;If you feel that you need more protection from heat on this wall, do the following:</p> <p>seal all air penetrations on the attic side of wall (drywall seams, electrical and plumbing &nbsp;holes in drywall, etc) to prevent hot air from crossing the drywall. &nbsp;</p> <p>ensure that the fiberglass batts were installed correctly. &nbsp; Batts should fully encapsulate the opening between the studs. &nbsp;If you are not proficient with insualtion, hire an insualtion contractor to remove the foam board and examine the batt insulation. &nbsp;If the batts have become wet, they will need to be replaced. &nbsp;Ask the contractor what he feels the best insulation options are. &nbsp;Fiberglass, rock wool and other base products can be blown into bags which (blown in bags) provide more R value and more thorough coverage in the wall cavity. &nbsp;</p> <p>In any case, this will not be a costly project. &nbsp;</p>