A vortex is a circulating eddy of air, like a mini-tornado, caused by low-flying aircraft. The effect, which is particularly significant as aircraft come in to land, is to suck tiles off the roof. Replacement tiles need to be firmly fixed and Redland 49 tiles allow for both clips and nails to be used as required by the BRE guidance document DG467. The small format of the tile combined with this dual fixing provides the most secure fixing possible.
Heathrow airport has been offering replacement roofs when vortex strikes occur for over 20 years and the Redland 49 tile is one of the few products to have passed stringent wind tunnel tests, qualifying it for use in the project.
Contractor Richardson Roofing has been using Redland 49 tiles on this project for decades and Site Manager Kevin Taylor is an enthusiast: “It’s a lovely adaptable product that is easy to work with. It’s an easy tile to fix and has a soft cambered profile, making for a good looking roof.”
Redland 49 is a small interlocking concrete tile that has been in manufacture for 65 years and is particularly popular in London and the South East where it is the ubiquitous tile of choice for huge areas of post-war housing.
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Keeping the college on message
The roofing department at Leeds College of Building is now a NFRC centre of excellence as well as being the largest college of its kind in the UK. Chris Messenger, lecturer in roof slating and tiling, takes us through a typical day at the beginning of the teaching year.