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I agree with the previous post about felt having the shortest lifespan but its certainly not the cheapest option.though I have recently been informed that Bauder felts can last upto 50 years! but are expensive. Felt systems are a dam site more labour intensive.There's a company in Bradford...

My drawings state firrings 1:80. so over a 320cm length only a 4cm fall,ie 4cm thick down to nothing The firrings I have are 320cm long by 8cm down to nothing,Am i Right in thinking this is 1:40 Thanks....Mark