Built up roof interrogate for architecs or designers or arch students? I HAVE A SCHOOL PROJECT WER I HAVE TO DESIGN A FLAT...

I HAVE A SCHOOL PROJECT WER I HAVE TO DESIGN A FLAT ROOF WITH A 1/4" SLOPE THE THING IS I HAVE NO CLUE AS TO WAT TIME TYPE OF MATERIALS TO USE. I HAVE TO INSERT NOTES AND THINGS OF THAT SORT IVE LOOKED ALLL OVER THE NET BUT CANT SEEM TO FIND THE RIGHT INFO? LIKE IS IT NAILED AND IF SO WAT TYPE AND SPACING TO EACH RAFTER HELP ANY ONE
Answers:    Search out info on the net for proper installation of a EPDM roof ( Ethylene Propylene Diene Monomer). You can frame the roof out of 2X10s, 16" on center and 3/4 cdx plywood, FLAT. Then commercial a rigid tapered insulation board on top, nail down, with the 1/4" pitch built into it. Your EPDM get glued on top.
This is one tough rubber roof. Remember the t.v. coverage of the Oklahoma City bombing? They blew away the front of the building? It looked on t.v. resembling a big tarp was limp over the blown out area. That be a EPDM roof. The stuff just wont rip.
The simplest is to use a reinforced slab roofing. But if you intend to use a roof framing system, you requirement to have first a flat-type steel rafter next to web member at approx. 2.00m spacing. On this rafters, you will installed 2x4 purlins spaced at approx. 0.40m-0.60m beside necessary frills like bow rods and tension rods. After the purlins, the roofing will next be installed. The roofing can either be everyday corrugated g.i. sheet gauge 26 or pre-painted g.i. roofing attached near tekscrews.