We’re over in Chicago Illinois on a flat roof project. So in this post you can see we’re starting to roll out the membrane the ISO board has already been installed. So this roof will conform to the new R-30 insulation code.
So the A/C units been reset the membrane in this picture is johns manville 60 mil tpo white reflective we’ve got two layers of 2.6 inch ISO board for a total of R-30. And the roof is naturally pitch so it’s higher the video and then goes to a drain which is behind us. It’s a mechanically fastened system. So you can see the washers and the 7 inch screws going down to the deck once the sheets are laid out we run the robot and heat the seams to approximately 1,100 degrees. So in essence creating a monolithic roof again here we’re rolling out more sheets we let them sit awhile and relax and now this would be a mechanically fastened membrane which means it screws down to the under decking on this particular roof.
It’s under 20 feet tall so we’re picture framing what that means we run a five foot strip of TPO. Around the edge, which essentially increases the frequency of the screws protecting the roof from uplift.
You can also see here we’ve done quite a bit of carpentry and added two by fours all around the perimeter since the R-30 insulation, increase the height of the roof they almost six inches, so we had to build up the outside and then come back later and put a metal flashing on.
So as we make our way down the roof we’re going to continue to heat weld the seams. One little trick, we lay these boards down, that way as the robot goes along and heats the seams, it doesn’t grab the loose sheet on top and create wrinkles. and these two gentlemen here they try to stay ahead of us and they continue to fasten down the high load screws; keep ahead of the welder You can see that in the picture here for now we’re using seven inch screws these are ultra fast screws and smooth washers.