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thanks for the replies i didn't explain which way the polycarbonate sheets will be running as they will be fixed onto glazing bars which are fitted on top along the whole length of the rafters..the slope will be running away from the extension at 3.900 mts . that why im doing 900mm spacings...

hi all im doing a low slope roof above decking at 5 degree and it going to be covered with 900mm x 4mts long polycarbonate sheets..i need to know what size joist i need to span 3.900mm without the use of purlins..the joist spacings will be 900mm with 4x2 noggins..also it will need to take the...

hi all this is my first post and i hope in the right forum.. I'm planning to build a 7.200mts x 3.900mts polycarbonate roof over my decking using wickes 900x4mts sheets..i have a plan how i'm going to build it but not sure if it be strong enough to hold up the weight of the snow.. here is...