Over Cladding Asbestos Roof Sheets

Asbestos cement roof sheets are designed to be a wee bit porous allowing the sheets to breathe.

Over cladding asbestos roof sheets.

It can also be used to reseal your roof making it watertight again and to protect the existing roofing structure from the elements preventing further damage which might lead to the entire roof needing to be replaced. When overcladding an asbestos cement roof it will also be necessary in most cases to include a layer of insulation to meet current day building regulations. But over time people are now replacing asbestos sheets to asbestos free alternatives because it s safe. This is a cost effective approach with an aesthetically pleasing and watertight result.

One of the most common construction materials used in older buildings is the cement sheeting or fibro cladding. The first stage is to fix a framework to hold the metal sheets in place directly to the purlins underneath the asbestos cement roof sheets. This allows some damp air from inside the garage to get out through the sheets and reduce condensation. This can be used to increase the insulation in your roof bringing your property in line with current legislation and lowering heating bills.

As the weight of the system is less than that of the potential water absorbed by the existing asbestos cement and fibre cement sheets there is no requirement for structural calculations. This stops any leaks and leaves you with a brand new roof without having to disturb the old one. Extend the life of your asbestos roof with over cladding. Cladding over asbestos unfortunately asbestos releases harmful fibres if disturbed and causes harm if it s inhaled.

Over cladding adds one or more additional layers on top of your existing roof. It therefore requires no additional structural supports. This is especially true when it comes to asbestos cement roof coverings. The insulation is then installed into the framework often an ashgrid system so named after the original manufacturer ash lacy construction and the metal weather sheet is the fixed to a bar.

Over cladding or over sheeting asbestos roofs means the original asbestos roof stays where it is while new sheets are positioned on top and secured by a fixing that goes through the old roof and attaches to the existing structure of the building. Asbestos over cladding in some cases asbestos containing materials need not be removed and can instead be over clad. Filon over roofing is lightweight yet strong and is manufactured to the same profile as the existing roof. This means the new roof cannot get enough stability on top of the old one a common risk of over cladding.

However many asbestos roofs are built with concrete portals meaning the roof is supported by a small number of concrete arches. At roofclad we strongly recommend not going down this route and replacing the roof instead.