Post by cobre » Sat Feb 26, 2011 2:59 pm
Post by cubleyboy » Mon Feb 28, 2011 11:01 pm
cobre wrote:I have to install a secondary ceiling independent of the existing lathe and plaster ceiling to meet 60 minute fire regulations. The secondary ceiling will only support the weight of a double layer of 12.5 mm Soundbloc plasterboard and need to be completely independent of the existing ceiling . The maximum span is 3.8 metres at widest point and tapers to 2.8 mteresover a 9 metre length. Can anyone help with the joist size that would be required