![]() 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." ![]() The other says that gap provides more space for condensation to accumulate on the underside of the roof and cause inside-out rusting. 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. A metal roof purlin is a piece of metal panel that runs perpendicular. The International Residential Building Code (IRC), which is the basis of most North America’s building coide, identifies these standard industry measurements. If you’re looking for something that is both durable and easy to install, welded rafter purlins may be the ideal choice. The standard roof rafter spacings measured on-center are 12, 16, 19.2, and 24. The standard distance in most buildings is between 12 and 24 inches. 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. Consider the spacing of metal roof purlins in addition to the spacing of the roof. The second span table is the same as the first. The first span table is for roofs where the ceiling is not attached to the rafters (with no snow load), a live load of 20 Psf, a dead load of 20 Psf, and a deflection limit of L/180. The purlins of a roof support the weight of the roof deck. ![]() I am getting two different stories from contractors regarding purlins v.s. Rafters with ceiling not attached to rafters, ground snow load 50 Psf, dead load 20 Psf, deflection limit L/180. metal buildings, though they sometimes replace closely spaced rafters in wood frame structures. 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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