UNDER JOIST
APPLICATIONS

Application Instructions

Apply SuperFOIL directly from the roll on the internal joist face, starting horizontally at the external wall. Staple the start of the roll onto your joist and continue rolling the product across the joists. While fitting SuperFOIL, hold the product taut and staple it into place at approximately 50mm-100mm intervals using the correct size staples.

Once you finish a length, cut it to the correct size and continue fixing the next layer with a minimum of a 50mm overlap. Ensure secure fixing by stapling the insulation onto the joists where the joint crosses. Seal all joints, tears, and cuts with SuperFOIL 100mm tape, paying special attention to any penetrations through the insulation to ensure an airtight finish.

Complete your installation by fixing counter battens on top of the insulation horizontally (maximum of 600mm centers) to allow adequate air space. Attach your internal finish to battens following the manufacturer’s guidelines. SuperFOIL should be stored indoors until used and covered within 48 hours after fitting.

For a more comprehensive guide to properly installing SuperFOIL products in a Flat Roof Over Joist application, we’d encourage you to download our complete installation guide, for free, by clicking the button below.