This house has a one layer three tab shingle on it. It is in Charlotte, North Carolina.
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In North Carolina, a house may have up to two layers of shingles. Are you planning on owning this house for a while? Nailing over the existing shingles may cost less now, But will cost more in the future. Warranties on nailovers are usually less than a tearoff. I believe in “doing things right the first time.” So I would suggest a tearoff compared to a nailover. Nailovers are usually good if you plan on selling the home soon.
No way,you must take off existing shingles and felt,then check and repair wood decking and start with new felt and shingles so the roof will give you full life.
I would certainly recommend a tear off versus a lay over for the following reasons.
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You could very easily cover over rotted or damaged plywood or roof decking creating more of an issue and expense down the road.
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Most roofers will not replace flashings including vent pipe collars on a lay over which should be done at the time of a new roof. If they do replace flashings on a lay over they most likely will not get under the bottom layer of shingles which is where the flashings should be to do the proper job.
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You will not get a full warratny with your roof and if you do it will most likely be void should you have an issue and the roofer comes back to look at it and finds its due to the lay over.
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Yes a tear off will cost more up front but you will have the peace of mind knowing all the decking is fine, flashings have been replaced, and most importantly felt paper and ice and water shield has been used to properly protect your investment.
Tear it off tear it off tear it off.even if your selling.any decent home inspector will notice that and could cause problems selling.do it right the first time…
I would never recommend installing an additional layer of shingles over existing shingles.
The cost of removing the existing shingles prior to installing the new is a small price to pay for the job to be done correctly.
I would recommend against adding a layer to an existing roof. The best means of ensuring a proper installation is to to do a complete tear off down to the sheathing.
In todays world of land fills and recyling -i would causion on tearing it off at this time. But to do a reroof instead. Unless the code says other wise .or you have a shingle recycling program in place. We must stop putting shingles in the land fills until we have this responsible way to handle the recycling of the shingles.Better to incase them for now uder the new roof till future.donnie harold harris
In my opinion tearing the roof off if the best way to go expecialy in N.C because the heat . Adding a second layer of shingles to you house is less costly & can last but it adds more weight to your house it holds more heat to the roof which is why I would think twice doing it in NC . Some shingle companies do not warenty "lay overs " . Most customers I do " lay overs " for here in north western PA have rentals or they can not afford a complete re roof so a " lay over. " but still need a roof . I always replace all my pipe flashings. , I make all the wall flashing is in good shape. , same with the chimney flashings , I use bigger nails . If the is any soft spots or bad wood I repair it . So to can answer the question. In NC I say tear it off to the bare wood & start over fresh