Sujet qui prolonge geostrategique.net sur l’origine de l’effondrement des Tours du Wall trade Center aux USA
WHAT IS CLADDING?
▪ Cladding is a type of « skin » or extra layer on the outside of a building.
▪ It can be attached to a building’s framework or an intermediate layer of battens or spacers.
▪ It is mainly used to stop wind and rain from entering the building.
▪ Cladding can also provide sound and thermal insulation as well as fire resistance.
▪ It is often used to make a building’s exterior look more attractive.
WHAT IS CLADDING MADE FROM?
▪ Wood, metal, brick, vinyl, composite materials that can include aluminium, wood, blends of cement and recycled polystyrene, wheat/rice straw fibres.
IS CLADDING FIRE RESISTANT?
▪ Excellent fire resistance cladding: brick.
▪ High fire resistance cladding: planks or weatherboards made from fibre cement or steel.
▪ Good fire resistance cladding: aluminium, reconstituted timber products.
▪ Poor fire resistance cladding: timber weatherboards, plywood sheets.
WHAT ARE THE ISSUES WITH ALUMINIUM COMPOSITE CLADDING PANELS?
▪ There is potential for fire to spread quickly upwards in a building if inappropriate products are used.
▪ The panels consist of two aluminium faces and a core material such as polyethylene, a mineral-based material, or a combination of both.
▪ Panels are between 3mm and 5mm thick.
▪ They may look similar on the outside, but their core materials may differ and affect their fire resistance.
▪ Panels with a higher proportion mineral core are considered to withstand fire better, but can still be considered combustible.
▪ Cladding is only required to meet the minimum standards under the Building Code of Australia.
▪ The National Construction Code (NCC) requires buildings to have elements such as non▪combustible external walls to stop fire spreading.
Sources: http://www.yourhome.gov.au; Australian Building Codes Board; NSW Government