![]() On last question, what do you think of these purlins I found, with vents built into them, the Cor-A-Vent Purlin Vent? I know you can't make an educated guess if you haven't used it previously, but I just wanted to see what you thought at first glance. The old decking is composed of 1x8's and I'm concerned that a 100 yr-old house with that style of decking won't have a flat enough decking to install the new roof to and not have "wrinkling." Sealed Roof Deck Option 3 For asphalt, metal, mineral surfaced, slate and slate-type roof coverings, Options 1, 2, or 3 are permitted. If you get premium, kiln-dried lumber, then you could span 10.5’ with the same size of lumber and. This is set by the roof use you selected in the. Alternatively design in a specific timber or steel material type. Pick List all suitable timber and steel sections to design across all timber and steel sections. For instance, 2 grade 2x4s at 16 on center will span just over 9’. Design of single span rafters in roofs in houses, office buidlings, schools and other structures. There is no standard spacing it depends on what size of rafters you want to use, and the span of your shed. The other says that gap provides more space for condensation to accumulate on the underside of the roof and cause inside-out rusting. For standard shed roof rafter spacing, see rafter span chart. ![]() Energy efficiency - One contractor said that purlins help by adding an air-gap that provides insulation. The following questions/concern that I have arose and, in all my googling, I can't find a definite answer. Again, in both cases, I intend to use a radiant barrier. onto the current decking, and then installing the new roof to those. I have the option of installing the new roof directly to the existing deck (or installing new decking if need be), OR installing 1x4 purlins 2 ft. I am getting two different stories from contractors regarding purlins v.s. I will be removing the old roof and installing the new one, along with a radiant barrier under that. It currently has decking over the rafters, with the old metal shingles (yes, metal shingles) applied to that. standing seam metal roof on a house built in 1907.
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