new roof over existing metal roof: "I have a house that is over 100 years old. ..." - Guest User (8/7/2014) | I Have An Existing Metal Roof and Have A Question | Ask The Experts Forum

I have a house that is over 100 years old. It has the original metal roof on it. Due to the age, pin hole leaks, etc, I want to have a new metal roof put on. So far every contractor I have talked to has a different way they say it needs to be done. All of them purchasing the roof from the same manufacturer. One has said it can be installed on top of the existing metal roof directly using only a titanium paper barrier. One has said the old roof needs to be removed, and since it was installed over boards that have gaps between them, that it needs to be re sheeted with plywood. A third has said that the existing roof can stay, and that they recommend putting perlins on the existing roof and then installing the new roof and there is no need for any other type of vapor barrier. Two of them were sent directly from the distributer after I called them. Needless to say I am confused. How should this be done?	Guest User 8/7/2014	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/19737/find/
Number 2 and 3 are correct. Number 1 is not. I prefer the option of going over a solid deck and depending on the construction (attic vented or not) the vapor control layer is at the envelope/insulation layer.	Eric Novotny An informed customer is the Best Customer! 8/11/2014	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/19738/find/
We have a metal roof now sure if it is tin, galvanized steel or something else. Due to some pooling issues about 3-4 ft from the gutter we have rust holes. I can send you a picture. Patching & Sealing is no longer an option and it oes not solve the water pooling problem. I had a contractor suggest going back 5-6 feet cutting the damaged metal out, lapping the new metal under the existing metal roof...I could be wrong but, I think he has a good plan. The existing metal roof is 20-30 years old. How can I find the same size & shape metal roofing? Would it be best to use a 8 foot sheet of metal letting it overlap where the old metal and new metal join together?	Kathy Shepherd 12/16/2014	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/19739/find/
I hate to say but the first thing you need to do is to fix the ponding issue. Then install ice and water shield. it might work cutting back 5-6 feet and 'patching' the same panel profile back in, but I am not convinced for a residential project that it would be cost effective compared with replacing the roof in its entirety.	Guest User 12/16/2014	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/19740/find/
The roof span is 80' & I do not think I will be able to find a metal that matches the panel profile. Do you know of a company that sells a large variety of metal roofing material? I did look at the ice and water shield and wish I had used it on my roof instead of felt. The roof repair I am planning is a commercial metal building so the roof is framed with metal beams. That is one of the problems I am worried about if I replace the portions of metal that are rusting where the water is pooling how is that going to stop the ponding issue? The new metal roofing is going to lay the same as the other did right?	Guest User 1/28/2015	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/19741/find/
Hi, I have a 14 X 70 mobile home which is 20 years old. I have a metal roof on it and it gets so hot in the summer. Would it be wiser to put shingles over the metal or not would it save energy ?	Barbara Ennis Yahoo 1/28/2015	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/19742/find/
Barbara, Asphalt, of the same color as the roof, will only exacerbate the issue of trapped heat. What color is the roof now?	Eric Novotny An informed customer is the Best Customer! 1/29/2015	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/19743/find/
I have an older metal shop that the roof is part of the structure. Can I purlin over and sheet with 5/8 osb then install my ez snap panel? The pitch is 4/12, and do I need tar paper between the old metal and my new purlins?	Randy Howard 3/20/2015	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/19744/find/
Randy, No need for felt between the purlins and the new roof. You might want to lay down some underlayment on the roof prior to putting down the purlins though.	Eric Novotny An informed customer is the Best Customer! 3/21/2015	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/19745/find/

If you would like to reply to this thread, please log in. If you do not have an Ask the Experts forum user account, create one here.