The correct way to install a Vapour permeable or vapour impermeable wrap, for air tightness to properly leverage the products that are being installed. Some installers are used to installing foil sarking which is not installed in an airtight fashion. Proctor, Siga, Proclima membranes and other high-quality membranes designed to be installed for airtightness are installed very differently. Airtight membranes are designed to be installed completely airtight, so we need to install them like that.
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