I have a concrete slab of 22ft by 12ft and have put down a wood frame of 4×2 laid down on the 4 inch to create a box shape so i can put rockwool in the frame and cover with ply for the base.

However do i need to fix the frame to the slab or will it be strong enough with its own weight when i build the frame on top (mainly 4×2 to the slab size, 8 foot sides with a roof pitch to 3.7 metres or there about, finished with waney edge larch). The front will have two french double glazed windows and one side will have a window.

Will it need fixing to the slab or not?

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