Correct Installation Method?

Kurt Johansen
4/18/2012
We are getting quotes to have a CenturyDrain 29 ga. metal roof installed on our house. We have 2 quotes with conflicting info. We plan to remove old shingles and go down to the plywood. One of our quoters is telling us that they want to add 2x4 horizontal strips on our steep slope and install over the strips. He also says we do not need any roof venting. Are these acceptable install methods? Thanks.
Todd Miller
Isaiah Industries, Inc.
4/18/2012
Unless a home has been built with "hot roof theory" I always suggest attic ventilation whenever the construction allows it. As far as whether or not to use battens with the new roof, there could be some greater energy efficiency by using battens as well as some extra ice dam protection. However, with a well vented attic, you will have a good roof without the battens as well. Horizontal battens do not in my opinion substitute for attic ventilation.
Eric Novotny
An informed customer is the Best Customer!
4/18/2012
In all likelihood, you existing is a ventilated attic design. If that is the case, the venting does not need to be above deck (between the roof and the roof deck) because it is vented at the attic level. Like Todd mentioned, the above deck vented idea does have some additional benefits and resultant complexities, however, it should not be used as a band-aid for an improperly vented attic (if that is what you have). Pictures are always helpful in these cases.
Guest User
4/18/2012
Thanks for your responses. I probably should have mentioned that our home is approx. 100 years old. We do have attic vents on all of our end peaks. We have multiple roof lines and to complicate things further we have a gazebo porch. Here's a picture.
Kurt Johansen
4/18/2012
I should have probably mentioned that our house is approx. 100 years old. We do have attic venting on all of the peaks. Our house has multiple roof lines and to further complicate things we have an attached gazebo porch. Here's a pic.
Todd Miller
Isaiah Industries, Inc.
4/18/2012
Kurt, that's a beautiful place. Do you have intake vents as well for the attic, such as in the overhangs at the bottom of the roof?
Guest User
4/18/2012
We do not have intake vents.
Todd Miller
Isaiah Industries, Inc.
4/18/2012
Unfortunately it sounds like your current ventilation is limited at best, with only gable vents, and with the unusual geometry of the attic. I still think you will be fine without putting the roof up on battens but if you wanted to be extra safe, it would not be a bad idea.
Eric Novotny
An informed customer is the Best Customer!
4/18/2012
+1 Gorgeous, distinctive home. No intake vents is a bad thing. That means all the intake air is from the home which universally defeats the purpose. You are going to have to do one of 3 things: - Provide some intake air via soffit/overhang retrofits - Put a gable end fan to push the air - Install the roof via battens and move the ventilation to above the roof deck.
Guest User
4/20/2012
Thanks to you both for your input. It has been very helpful. We will be sure to add some venting, better safe then sorry….. I will likely have more questions as our other quotes come in. We did some job drive by's yesterday and have decided we probably won't be happy with the 29 ga. CenturyDrain roof which has the exposed fasteners. Back to the drawing board.
Dick Bus
4/20/2012
Sorry to hear that you are going back to the drawing board. It is good that you are doing the research for this very important long term investment. I would recommend that you consider using product from one of the members of the Metal Roofing Alliance (MRA) as they have all pledged to promote top quality products to the residential market. MCA (Metal Construction Association) certified product is even better. Contractor selection is very important. Make sure you ask for reference and visit jobs of similar scope to yours that they have done. Let us know if there is anything else we can help with.
Guest User
4/22/2012
Thanks, we will be back. We know we are doing metal, we just have to decide which to go with.
Eric Novotny
An informed customer is the Best Customer!
4/23/2012
That is good. I would think that a metal shake or shingle profile would look good on that home.
Guest User
4/24/2012
I think you are probably right, however in doing our research we got the impression that the metal shingles are more costly and we questioned whether they would shed snow as well. Cost is a factor for us and one of the main reasons for going to metal is to eliminate the need to remove snow in the winter. Are we incorrect in our assumption about cost? Our current metal roof quote is $16,800. This includes tearing off the asphalt shingles (2-3 layers).
Eric Novotny
An informed customer is the Best Customer!
4/26/2012
Kurt, Pricing all depends on the vendor at the end of the day. I have seen standing seam that is 2X what we charge for steel shingles so it is a bit of a variable depending on who is selling what. How many square feet is the roof if I missed it in the thread somewhere? Regardless of metal choice, you are going to want to take a look at the insulation and venting details. These are items that will pay for themselves a bunch of times over in the future. Eric
Guest User
4/27/2012
Not sure where we ended up for sq. footage but the house is 2200 and with the multiple roof lines and gazebo porch it must be over that. I did forget to mention that the quote is based on 26 ga. metal and we did discuss areas of the roof that we currently have ice dam, venting issues. His quote does include fixing those issues and replacing any areas that might have damage from moisture. He uses ridge cap venting and a bubble ridge vapor barrier that is about 1/8" thick with a foil covering and the rest is 30# tar paper.
Eric Novotny
An informed customer is the Best Customer!
4/27/2012
Assuming that you probably have a minimum of 30% more roof than square footage, that price on Metal is very aggressive if it is a quality product.
Guest User
4/27/2012
The metal has a 40 year paint warranty and is G90 galvanized made by Steelscape with a BeckryTech paint system, Energy Star rated and qualifies for tax credit if that helps at all. We looked at several of his job sites and talked with a couple of people he's done work for and they have given him rave reviews. His job sites look really nice, professional looking finishing.

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