1. ladder ahead of work (insulation)
2. tape purlins. mark cut at intervals-50 1/2, 48, 48, 48, etc. 
3. remove cover to cut
4. string from top between purlins to support and sag insulation evenly.
5. measure and cut insulation 
6. line up with cut and unroll from top, supported by string, to eave. 
7. join at eave.
8. attach horizontal stops at endwall
9. attach vertical stop at top of sidewall
10. lay out tracks for sheet on roof
11. slide sheet up along tracks
12 remove tracks
13 check square from endwall edge
14 secure to purlins
15 cut away string from inside