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Username Post: Is it ok to Re shingle the roof over old shingle        (Topic#102267)
temac 
Senior Member
Posts: 216

Loc: Kennebunk , Maine
Reg: 06-18-04
05-28-05 08:38 AM - Post#706539    

Should I tear off the old shingles or can I Re shingle the roof over old shingles. I have one layer of shingles and would like to just lay the shingles over old shingles ..

 
lonjack3 
Senior Member
Posts: 96

Loc: North Carolina
Reg: 08-07-04
Re: Is it ok to Re shingle the roof over old shingle
05-28-05 08:48 AM - Post#706540    
    In response to temac

Generally speaking, yes. Unless your trusses can't support the additional weight or your old shingles are curled in any way.

 
hotwheels57 
Senior Member
Posts: 8602
hotwheels57
Reg: 11-20-02
Re: Is it ok to Re shingle the roof over old shingle
05-28-05 08:56 AM - Post#706541    
    In response to temac

I was told that you could reshingle once (or maybe twice?) over an original roof, but that it isn't the best way to do it. I guess the heat generated will effect the newer shingles. Of course, AZ is probably a bit warmer than where you are.
Karma is the universal equalizer. The Ignore User feature comes in a close second.


 
Ronnie44 
Senior Member
Posts: 9041
Ronnie44
Loc: Tampa Bay, Florida
Reg: 12-23-03
Re: Is it ok to Re shingle the roof over old shing
05-28-05 09:00 AM - Post#706542    
    In response to temac

I actually prefer to roof over one layer of shingles. If the tabs from the first layer are curled, it is a good idea to break off all of the tabs before covering the roof with new 30# felt, and then the new shingles. On a re-roof, I prefer to weave the valleys rather than install new valley metal. I would replace the old drip edge however.
Make sure that the nails that you use will penetrate the wood sheathing of the roof. These will probably be 1/2" longer than what was originally used. Have fun and be careful. If the roof has much pitch, get a safety harness and tie yourself off. Spending money at the hospital can quickly wipe out any savings by doing the roof yourself.
In most municipalities two layers of shingles is acceptable. The next time the code will probably require a complete tear-off.
In memory of George K Fullam(Goodwrench) Died 31 Mar 2005

To view my '57 Bel Air, and my previous '55 & '56 hardtops and '56 Corvette: Click Here


 
blown55 
Senior Member
Posts: 1911
blown55
Loc: Northern Ohio
Reg: 10-06-04
Re: Is it ok to Re shingle the roof over old shingle
05-28-05 09:54 AM - Post#706543    
    In response to temac

Ronnie said it all....Dennis
ifurnotblownusuk...www.cardomain search blown55,picturetrail.com search blown55, IM-dennisatmorris@hotmail .com


 
Vaughn 
"12th Year" Gold Supporting Member
Posts: 15391

Loc: Colorado Springs, CO
Reg: 08-08-04
Re: Is it ok to Re shingle the roof over old shing
05-28-05 10:38 AM - Post#706544    
    In response to blown55

Is it cedar or asphalt shingles? Are you near the ocean?

Do not shingle over the top of cedar shingles, you will trap moisture in the roof and cause it to fail prematurely.

If it is asphalt you can do it over the old, as long as there isn't another course on top already. Weight can be a real factor, so you don't want to do more than one layer over the top of old. The next thing is: Do you have really hot summers? If you do, you don't want to go over the top of the old roof. The asphalt shingles have "Thermal Mass", which means that they suck up all the heat of the sun during the day and radiate it down into the house. You will have huge air conditioning bills in the summer - and you will have to run your A/C all night long to be comfortable. If on the other hand your summers are relatively mild, you might want to roof over the top of the old layer because it will help to heat the house in the winter.

Now getting back to the ocean question. If you are close to the ocean, you really need to pull off the old shingles. The salt air environment will cause asphalt to fail prematurely no matter what you do. Your old shingles will continue to curl and and eventually trap moisture next to the roof, causing the house structure to fail.

 
temac 
Senior Member
Posts: 216

Loc: Kennebunk , Maine
Reg: 06-18-04
Re: Is it ok to Re shingle the roof over old shing
05-28-05 01:52 PM - Post#706545    
    In response to Vaughn

Thanks for your replies ,these are asphalt shingles..and have been on for 22 years ..we are aprox 5 miles straight line from the ocean .. I have never thought about the ocean , I'm sure the salt must be in the air ...
I just went to home depot and checked their shingles , the 30 year looked appropriate .. I would love to put a metal roof on but when the snow came off it would tear my deck completely off ...

 
Ronnie44 
Senior Member
Posts: 9041
Ronnie44
Loc: Tampa Bay, Florida
Reg: 12-23-03
Re: Is it ok to Re shingle the roof over old shing
05-28-05 03:19 PM - Post#706546    
    In response to temac

Don't worry about the ocean. We have a little bit of salt air, and hot sun, here on the coast of Florida. If your old shingles lasted 22 years up there, these new ones should go 30 with no problem. The extra layer will actually help insulate the new shingles from the effects of the elements.
In memory of George K Fullam(Goodwrench) Died 31 Mar 2005

To view my '57 Bel Air, and my previous '55 & '56 hardtops and '56 Corvette: Click Here


 
temac 
Senior Member
Posts: 216

Loc: Kennebunk , Maine
Reg: 06-18-04
Re: Is it ok to Re shingle the roof over old shing
05-29-05 01:27 AM - Post#706547    
    In response to Ronnie44

Thanks Ronnie44 thats what I needed to hear

 
Impalaman1966 
Senior Member
Posts: 6228

Loc: Geneva, Il., USA
Reg: 03-17-01
Re: Is it ok to Re shingle the roof over old shing
05-29-05 06:55 AM - Post#706548    
    In response to temac

my roofer buddy says 2 RE-roofs max..total 3 layers. mine was too far gone to re-roof even once, so we did a tear off and replaced lots of rotten wood, even though i never had a single leak.


 
Sgt._Grumpy 
"11th Year" Silver Supporting Member
Posts: 2767
Sgt._Grumpy
Loc: Long Island, New York
Reg: 12-30-00
Re: Is it ok to Re shingle the roof over old shing
05-29-05 04:24 PM - Post#706549    
    In response to Impalaman1966

Do it right and strip off the old roof first. Most companies will not honor their warantees if you go over an old roof. Plus overall looks are better if the new shingles are laid over a flat surface. If you have any flashing issues, ie. alongside a side wall or a chiminey, the weather will run alongside the flashing of the old roof under the new shingles. Going over the old roof will shorten the lifespan of the new roof.
I was 45 when I put a new roof on my house using 40 year shingles. I did it right and figgure if I live to be 85, I might have to pay someone else to re-roof it then!
3 cars, no time to drive'em"
Chevytalk Member #2570
"Insanity has replaced reason in the design & construction of this vehicle"


 
tooomuch7 
Frequent Contributor
Posts: 1258
tooomuch7
Loc: Hartford Ohio
Reg: 03-18-02
Re: Is it ok to Re shingle the roof over old shing
05-29-05 05:52 PM - Post#706550    
    In response to Sgt._Grumpy

About 12-15 years ago I let a roofer friend of mine do a cover over on my roof.Guess what,next week another roofer is coming to tear both layers off.I am getting alot of nail pops and I am afraid if we get any strong winds they will rip off.I am not a roofer,but I would say tear it off dont cover over.It sounds like ronnie knows what he is talking about,but everyone has their own opinon.
http://www.picturetrail.com/gallery/view?p=999&gid=5387542&uid=2695815&members=1


 
72novaproject 
Senior Member
Posts: 3210
72novaproject
Age: 58
Loc: D/FW Texas
Reg: 02-18-03
Re: Is it ok to Re shingle the roof over old shingle
05-30-05 12:01 PM - Post#706551    
    In response to temac

Guess I should chime in as I am a Roofing Contractor.

The biggest problem with an overlay is the penitrations and terminations. You can't just lay shingles over the old ones. If you are going to overlay, cut out the old shingles around all the vents, walls and chimneys so you can flash them properly.

I feel that it as hard enough to replace a roof as it is and you only need one every 20 years or so, so why not go the extra mile and tear it off. It will look better, give greater longevity, and reduce the load on the structure.

Owens Corning Installation Instructions

 
ehchvac 
"3rd Year" *VIP* Founding Member
Posts: 728
ehchvac
Loc: ma
Reg: 05-05-02
Re: Is it ok to Re shingle the roof over old shingle
06-04-05 12:51 PM - Post#706552    
    In response to 72novaproject

the extra shingle weight can be a problem, but for the most part you are only allowed one reroof because of potential fire problems.
too many layers of shingles on a roof is like roofing your house with a tire.
and anyone who has had the pleasure of a tire fire knows they are real tough to put out.

 
alans 55 
"13th Year" Gold Supporting Member
Posts: 3738
alans 55
Age: 66
Loc: Amarillo, Texas
Reg: 03-20-01
Re: Is it ok to Re shingle the roof over old shingle
06-04-05 03:03 PM - Post#706553    
    In response to 72novaproject

most insurance companies will pay to tear off 1 roof only. If you reroof over the old one and save some money, remember in X# of years when you have to reroof again you will have 2 layers to tear off and the insurance company will only pay for 1. roofer will charge extra for 2 tearoff's and would be willing to bet you will end up paying money out of your pocket.

just a thought.
Cruzin the Texas Panhandle,1/2 way between somewhere and 1/2 way between nowhere
www.picturetrail.com/alanan55
Drivin'my 55 Chebby 210 and playing w/my
40 Ford coupe 327/4sp/9" found and brought back home after 33 years


 
72novaproject 
Senior Member
Posts: 3210
72novaproject
Age: 58
Loc: D/FW Texas
Reg: 02-18-03
Re: Is it ok to Re shingle the roof over old shingle
06-05-05 04:20 AM - Post#706554    
    In response to alans 55

Actually...

In 1995 the Texas State Board of Insurance mandated that all insurance companies must pay to remove all layers of roofing. This law came into effect due to the insurance industry practices from prior to 1995 that saved them tons of money and did not fairly compensate the insured for their loss.

EXAMPLE:
Assuming an average 35 square wood shingle roof prior to 1995, the roof would have a replacement cost value of appx. 11,375.00 to remove the old damaged wood and install a new wood roof performed by a professional contractor. This is based on the insurance concept of "Like Kind and Quality" which is clearly stated in the policy.

The insurance companies prior to 1995 bargained with the insureds to waive there 250.00 policy deductable if they would over-lay the wood roof with a composition shingle. This scope of work would produce a claim expence to the insurance company of appx. 4,375.00 saving them a boat load of money. In the process the insurance company was not really in violation of the policy guidlines which are governed by contract law (an insurance policy is a contract)because both parties agreed to the modified terms and conditions. Many home owners back then just did not realize what they were agreeing to. In car terms, they were insuring and paying premiums for a Corvette and when it got totled the insurance company was replacing it with a used Cavalier. Our State government went to work hard to change this which to me was only fair.

Now, if your roof is totaled by hail, and your house has a composition roof with wood shingles under it, the insurance company must pay to remove both layers, install plywood decking and install a new composition roof of like kind and quality to the top layer that was removed. In todays dollars that job would have a claim loss expense of appx. 10,150.00 .

SIDE NOTE:
The insurance companies are now (since 1995) required to pay the fiddler so to speak because they saved all that money back when. So what did they do, they raised everones policy deductable on any wind or hail loss to 1% of the insured value of the home. If you have a 2-story house with 1 layer of a modest composition shingle in a nice neighborhood it is entirly likely that you deductable (the amount that will be deducted from the check they write you) will be over half of what it should cost to have the work done. Ths opens the door for fly by night contractors to come in and do the work for a price that is to good to be true and it is. I stay busy repairing those jobs that end up leaking. It goes against the very nature of business to expect high quality for a low price.

I rest my case...Steve
To each problem exists a solution...now think.

The ZD Nova Page


 
Ronnie44 
Senior Member
Posts: 9041
Ronnie44
Loc: Tampa Bay, Florida
Reg: 12-23-03
Re: Is it ok to Re shingle the roof over old shing
06-05-05 07:29 AM - Post#706555    
    In response to alans 55

I have never heard of any insurance company refusing to pay to repair any part, of any structure, that was built according to the building codes in force at the time of construction.
In other words, if the code allows three layers, the insurance company will pay for the repairs.
Down here, most damage of this type is caused by a hurricane and in that case, your deductable is at least 2% of the insured value. To save money, some people opt for a 5 or 10% deductable.
Roof damage by a tornado, or falling tree, is subject to your normal deductable, unless those things occured while under a hurricane watch.
In memory of George K Fullam(Goodwrench) Died 31 Mar 2005

To view my '57 Bel Air, and my previous '55 & '56 hardtops and '56 Corvette: Click Here


 
temac 
Senior Member
Posts: 216

Loc: Kennebunk , Maine
Reg: 06-18-04
Re: Is it ok to Re shingle the roof over old shingle
06-05-05 11:57 PM - Post#706556    
    In response to 72novaproject

Thanks for your replies the Owens Corning Installation Instructions helped .. I have ordered the shingles and will strip off the old ones .. now I need to have a few dry days to get this done ... thanks to all ...

 
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