Soudal Trade Sanitary Silicone - White 290ml (Box of 12) 
Klober Double Roman Roof Tile Vent - Antique Red KG9857-3-0116 (Box of 10) 
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Code 6 Cast Lead - 1000mm x 6m 
Freeflow 112mm Gutter Internal Stop End - Black 
Everflex Contract AC50 Acoustic Sealant & Adhesive - White 900ml (Box of 12) 
OX Spectrum Trade XL 3 Core & Accessories Set 
Klober Profile-Line Adaptor & Flexipipe - KG979100 / KG979900 
Samac Aluminium Clout Nails - 50mm x 3.35mm 10kg Box 
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Soudal Solvent-Free Trade Grab Adhesive - White 290ml 
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Cromar Vent 3 Light Breathable Membrane - 1m x 25m 
Bond It Multi-Purpose Powder Filler - White 1.5Kg 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.
