By delapidated, I mean structually solid , but with holes in the roof , potential falling slates / plaster & water ingress. plaster on walls will be loose & dusty . The floor must be solid, ie concrete.
The aim is to make a building usable , by installing a low cost structure, until funds are available to restore the building.
The structure aims to :
A. protect users from lightweight falling roof debris, water and dust .
B. divert water from inside , reducing damp
C. Hinder potential Squatters, vandals & thieves from accessing the inside of the builidng
D. Idea 1 lets light in , idea 2 aims to insulate the inside, making it heatable in cold months, cooler in hot ones. the 2 ideas can be combined
Idea 1 - Frame with opaque grp sheet cladding
The idea is to make a wood / scaffold pole free standing frame, or screw battens to wall, using the 2m door off cuts (though drywall lining may be needed to clad them to meet building regs, though it may be exempt as temp structure . I call this 'clad beam'. )
plastic sheeting & guttering would be place on floor to collect falling water through roof holes, behind the panels, then diverted out of the building
a beam would be fixed on top of the battens, directy above the vertical beam (clad beam or scaffolding poles / wood
Then 5 x 2's or used scaff poles (to get a long span ) would be used as joists across space.
Alternatively galvanised c shape purlins could be used.
This structure is not insulated, hence idea 2
Idea 2. Frame with Insulaled panels (metal sided Kingspan sandwich sheet cladding)
This is similar to a previous idea (Pt 3. (Update) Metalclad' Wall & Roof Panels Placed in Wedge Block Shelter )
The frame is made in a similar fashion to idea 1, but more heavy duty as the roof is taking more weight
However depending on thickness of panel vertal beams may not be needs as the wall panels will take the roof weight.
C shaped Purlins would be best for the roof support beams.
Kinspan panels could be used to insualte the floor & rest on cladbeam battens, which would not rot & allow any water ingress to flow underneath for collection