FloPlast Half Round Downpipe Branch 67.5°, Black 
Soudal Acetoxy Stay Fresh Sanitary Silicone Sealant – Clear 290ml (Box of 12) 
FloPlast Square Line Internal Stop End Black – 114mm 
Code 6 Cast Lead - 800mm x 6m 
Bond It Power Proof Concentrated Waterproof Render Admixture - 1 Litre 
Bostik Brushable Waterproofer - Black 5L 
Bond It Superglue Activator Accelerator Spray Cyanoacrylate Aerosol - 400ml 
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Klober 15x9 Tile Vent - Antique Red KG9690-0116 (Box of 10) 
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Everbuild Seal Rite Strip Out Tool 
Everbuild Lumberjack 550 Floor Adhesive – 600ml 
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OX Pro Nylon High Vis Builders Line 105m / 350ft - Cyan 
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Everbuild P18 Gas Leak Detector - 400ml Geotec Felt
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Geotec Felt
Where your lead protects your roof from the weather, Geotec felt protects the lead from the roof. It does this in three ways. Firstly, lead laid nakedly on materials like concrete or stone may be at risk of corrosion, while lead on timber may slowly be leached away by moisture. This may start to damage and destroy the lead layer. Geotec felt serves as an intermediate layer that will guard the lead from moisture or corrosion.
Secondly, Geotec felt decreases drag arising from thermal movement. Lead expands and contracts as the temperature changes it. However, often the materials it is laid on do not. In addition, they may be rough or have an uneven surface. This causes damage as the lead strains against the material holding it up. Geotec felt provides a gentle, smooth surface for lead to thrive on, letting it expand and contract safely.
Thirdly, geotec felt is porous and permits airflow. This allows moisture to be dried out and ventilates the underside of the lead and the topside of the materials the lead would otherwise rest on. This reduces damp, and therefore the chance of rotting or mould. Geotec felt can therefore be an important asset in reducing roof condensation.
