Metal application - lathing or direct to shingle?

Guest User
5/1/2005
Hi, I am looking to have a 26g metal Kynar R-Panel roof installed over an existing shingle roof, in North Georgia. The current roofing has no leaks, but the home has a recent addition in process that will require roofing. There seemes to be some discussion on the point of whether to lathe the whole house with 1x4 or simply apply directly to shingle. What are the current pros and cons of this application procedure? I'd like to get it right and ensure the contractors we choose aren't trying to just ease the installation process?
Todd Miller
Classic Products, Inc.
5/1/2005
For this type of application, you could probably go either way but, in either case, install a quality underlayment over the old shingles. If you go with lathe, consider using vertical lathe and then horizontal lathe so that you can actually ventilate the resulting area. This will help with energy efficiency. Make sure that the product being installed is approved by its manufacturer for installation over lathe if you go that way. Also, if your currnet roof deck has a lot of unevenness, that might be reason to use the lathe.
Guest User
5/2/2005
Thanks for your time Todd! The house in question was built in 1904, the roof is in good shape with steep angles. The roofer is proposing 15 Pound Builders felt over the entire roof area and Elk Weather Watch (ice and water shield) around all end walls, chimneys and valleys. The lathing we discussed was to address one uneven area, otherwise will go without. We are targeting the installation of power vents to help the old home. Again thanks for your time.
Todd Miller
Classic Products, Inc.
5/3/2005
I would use a minimum of 30 pound felt instead of 15 pound. Check also with the manufacturer of the roofing on this. Good luck.
Guest User
5/9/2005
i am put metal roof on my porch the metal is 10ft long and 3ft wide how wide do i put my 2+4 to put the metal on to nail it down to it
Allan Reid
Dura-Loc Roofing Systems, Inc.
5/9/2005
It is best to contact the manufacturer of the roof steel as they will have specific requirements for your area and roof configuration to meet the code. If there is an upper roof that will be feeding snow onto the lower roof, you may want to instal the roofing on solid sheathing.
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