flat roof with roof lanterns

[rogerdodgerorkney]

I am looking at putting a flat roof with 2 x roof lanterns into a new extension.
i like the idea of sip panels but not sure of span and load details as the diagram attached.

i dont really want to have a 400mm+ thick roof i can help it. sip panels allow this if they will work.
a standard warm roof design makes for a very thick roof.

any ideas?

 

[freddiemercurystwin]

Can't see your pic, but I can't see how a sip panel would work for a flat roof on its own, normally you'd sit your panels on a structural frame, so your roof will be no thinner overall. SIPs are really for new builds and summer houses where the speed of construction advantages make them cost effective..

 

[rogerdodgerorkney]

sip's are good for 4m span as my drawing, but its fitting the lantern in and how that will affect the structure.