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So many Choices! First we own a home in the Florida Barrier Islands( Sanibel ) The roof needs to be replaced as there are some areas of rot on the roof. The home is a contemporary style about a 3 to 4 pitch with no ridge. It is also for lack of better terms a lodge style home Sheathed with toungue and groove pine on the roof and I assume some other decking on top of that. ( I have not been able to investigate completly ). Inside ceilings are all cathedrial and It appears that there is no insulation at all in the roof. Exsisting roof is shingle and to continue a long story we are having great problems with electricity consumption That I attribute to the AC system. It hase been checked out and is Ok but needs to run constantly just to keep the temp a couple degrees over where the AC is set. All thet being said I have decided to install a white metal roof. I am a former contractor with a great deal of experience but have never done a metal roof. I am confident I can handle it but there are some questions. From some research I have come to the conclusion that a Galvalume product is probably my best bet (agree) As there is rot I will strip the old shingles. My biggest question would be is there some way I may be able to add some insulation to the roof maybe some ridged foam or something or do you think just the white roof will be enough. Sorry for the book any comments will be greatly appriceated thanks for your time
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You are on the right track. The Florida Power and Energy did a study on the energy savings on white roofing and it was considerable. Our association participated in a study at Oak Ridge National Labs and they have posted a calculator on their web site on the energy you should save. Check it out.
As to your roof, After you strip the old and repair the decking, I would apply an air barrier of 6 mil plastic being careful to seal all the joints with tape. Then I would apply some ridgid insulation. The more the better but 1 1/2" will give you a significant value. You are reequired to put a minimum of a 1" air space. If you are using a vertical rib sheet, I would first strap vertically up the roof over the rafters with a 1" board. Then place a good moisture barrier over. The codes typically call for a minimum 30 lb felt however I reccomend a reinforced upgraded product. Then you can strap horizontally with a 1" or 2" board. This will provide the required air space and limit any heat transfer. Be sure to vent the eaves and ridge. There are a number of vented closure strips available that are profiled to fit the roof sheets.
Check with the manufacturer that you chose to ensure that the product and installation meet with the local wind uplift requirements. Good Luck.
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Brian,
First of all, you have my admiration for having a home on Sanibel -- an absolutely wonderful area. I get down that way once or twice a year to see my in-laws who winter in Fort Myers.
Anyway, some metal roofs can be installed over rigid foam but you would need to check for the manufacturer's approval. Adding foam means that the roof has to be trimmed out to allow for the extra thickness. If you're looking at doing that anyway, I would really suggest building a new roof over the old roof and creating an airspace which could be vented from the soffit to the ridge. You could put some insulation in this area, too, if you like but I would suggest at least 1.5 inches of vented airspace between the insulation and the underside of the new roof deck.
Another option, rather than create an entire new roof structure, would be to use a metal roof which can be installed over lather or battens. That way, you can create the airspace and then just put battens on top for the roofing attachment rather than new decking.
The vented airspace will really help to reduce heat transfer into the home. It will also helpt to allow any moisture in the home to escape. This could be important in an area like Sanibel.
Before doing this, you should have a structural engineer take a look at things to make sure that the home can handle the weight of all of this and to help with designing attachment points, etc. The good thing about metal roofing is that, because it is so light weight, that helps to keep the overall weight down.
I will also email you directly with some charts and graphs on energy efficiency.
Todd
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My standing seam steel roof seems to be leaving at valleys and around upstairs dormers. Where can I find an installation guide? A roofer is telling me that is installed wrong since the valley piece is installed over the panels.
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Various roof profiles and types have different installation details. My number one suggestion is to locate the manufacturer of your roof and obtain these instructions from them.
Beyond that, it does sound like there are problems with your roof installation.
www.mtlsales.com has some good downloadable details and drawings which show installation of various types of metal roofing.
8/20/2002
Dura-Loc Roofing Systems, Inc.
8/21/2002
Isaiah Industries, Inc.
8/21/2002
2/13/2003
Isaiah Industries, Inc.
2/13/2003