The main use for underlays is to isolate the lead sheet from the substrate and to allow the lead sheet to expand and contract freely reducing the amount of drag between the substrate and the lead sheet. They also held protect against corrosive attack from concrete, stone or leaching from some timbers as well as roof condensation.

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25M X 1000MM GEOTEC 220PY UNDERLAY PER.R Geotec Underlay Product Code: F87697 Manufacturers Part No: 86070025 Geotec 220PY underlay is a non-woven, needle punched, polyester textile underlay conforming to the Lead Sheet more... SSRP: £41.33 inc VAT Our price: £33.06 (£38.02 inc VAT) Quantity 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

50M X 1000MM GEOTEC 220PY UNDERLAY PER.R Geotec Underlay Product Code: F87698 Manufacturers Part No: 86070050 Geotec 220PY underlay is a non-woven, needle punched, polyester textile underlay conforming to the Lead Sheet more... SSRP: £105.79 inc VAT Our price: £84.63 (£97.32 inc VAT) Quantity 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50