Geotec Felt
Geotec felt decreases drag arising from thermal movement. Moreover, it assists against condensation, chemical attachment and guards against irregular surfaces.
Lead underlays are used primarily to isolate the lead sheet from the substrate, allowing the lead sheet to expand and contract freely, thereby reducing drag between the substrate and the lead sheet. In addition to protecting against corrosive attacks from concrete, stone, or leaching from certain timbers, they also prevent condensation on roofs.
An underlay of nonwoven polyester felt isolates the lead from the roof deck, which allows it to move more easily with thermal movement and dries any trapped moisture.
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