Posted: 6/6/2014 11:46:46 AM EDT
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I've been having leaks with my tile roof and have been getting estimates to redo the roof with either the existing S tile or a new flat tile (wifes idea), anywho some roofers would be installing a self sealing ice and water barrier and others 2 layers of #30 felt with a layer of white titanium underlayment. Which is better or what are the pros and cons to either system.
I'm also going with the ventilated battens for better drainage under the tile but one roofer is partial to using "hockey pucks?" under the wood strips to give drainage, anyone have any feedback on these? I know what these roofers tell me since they have an interest in getting my money but what say you roofers that don't have a dog in this fight? |
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Commercial roofer only, which is worlds apart from residential.
For the underlayment, we always go 40 mil self-adhered, whether it's specified or not. The synthetics (sharkskin, titanium, etc) aren't going to self heal around the fasteners, which is where the self adhered membranes excell. We do a lot of standing seam, and the manufacturers that we roll form for require a 40 mil self adhered membrane for their weathertight warranties. There's only one manufacturer that I know of that'll let you get away with a 30# felt. 30# has been around forever, and when the roofing above it is done properly, the felt will outlive the roof. Cost is the main advantage (to the owner) to the 30# and synthetics. I think a 2SQ roll of 30# is about $15, a 10SQ roll of synthetic is about $110, and a 2SQ roll of SBS-modified self-adhered is between $80-90. Also, the felts (and some synthetics) are breathable, which may or may not matter on a particular job. We use the synthetic stuff for temporary dry ins all the time. It makes for a nice tarp. All roofers have their preferences. Some feel that the felts are easier to chalk line, easier to walk steep slopes, some like the synthetic's light weight, some hate the light weight since it sucks putting it down in windy conditions, etc. What kind of tile are you getting quoted? Is windstorm an issue in your area? Some have their own batten systems. I've never heard the term "puck", but I assume it's the spacer placed at points along the battens to elevate them off the deck and allow water to flow through. I think Monier has a similar system. I've got S tile over 40 mil Polyglass MTS on my house. I didn't use battens though. |