In the past Ive used a vented insulated floor system like DriCore R without any special attention to a vapor barrier. Green Construction and Vapor Barriers P1 of 4 Stego Industries LLC San Clemente CA Tel.
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In lieu of the 6 mill polyethene that was never installed under the slab they want a 4-mill poly on top or an ASTM E96 topical vapor barrier of 06 perms or less.
Green building advisor vapor barrier. 949-257-4100 Toll Free. Since vapor retarder paint wont work unless drywall is first installed on the interior side of the closed-cell spray. In fact DriCore prohibits adding a second vapor barrier.
You need a vapor retarder To prevent this type of risky moisture accumulation cold-climate builders need to install a vapor retarder on the interior side of any open-cell spray foam installed on the underside of roof sheathing. Additionally a true vapor barrier is one that completely prevents moisture from passing through its material as measured by the moisture vapor transmission rate. Vapor barriers are installed along in or around walls ceilings and floors.
Of course this is done to prevent moisture from spreading and potentially causing water damage.
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