I have one question I am getting at basically. But let me set the scene. Framed this winter and covered roof with triflex. I used roofing tins held down with manual hammer tacker staples and roofing tins held down with 1/4" crown stapler. Seems the 1/4" crown staples when not driven to the proper depth (too deep) caused leaking. Not sure if the manual hammer tacker staples caused any leaking. I don't think so. Just getting around to roofing now and want to deal with leaks in triflex. Do you guys think it is ok to just cover the roof with 15# felt as I roof it?(main question) Or do you think I will have moisture problems with felt and triflex together?(i.e. roof won't be able to breathe enough beneath shingles. Roof is both cold and hot in spots. I am roofing with Certainteed 30 years Landmark Woodscapes asphalt. Perfect world I would cover the roof with double covereage 30# felt regardless of pitch and roof right away. Thanks, Wood.