New roof

Old 12-06-10, 12:31 PM
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Join Date: Apr 2004
Location: charlotte,nc
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New roof

Hello: We live in the Charlotte,NC area and will be having the roof replaced. There is a conventional asphalt [three tabs- is that correct usage?] roof on now. What are the different weight of the shingles?

What are the different weights of the roofing rolls used?

Is it usual to have flashing replaced all around?

Any other good ideas most welcome. Thanks
Old 12-06-10, 02:42 PM
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Generally, premium shingles are heavier and last longer. They may have a thicker backing material for greater strength and more aggregate stuck to the surface to provide protection from the elements. While a quality shingle may be heavier than a inexpensive one, the difference is usually not an issue as far as your roof carrying the extra weight.

I would not consider putting rolled roofing on your roof unless you are in an extremely tight money situation, and even then I'd only consider the roof temporary. If you were asking about the different weights of rolled tar paper, again heavier is generally better. The thicker, heavier material provides more protection to the roof.

Whether or not the flashing gets replaced depends on who is doing the roofing and the condition of your existing flashing. Some roofers go ahead and replace it while others only do it if the old flashing is in bad shape. Some flashing though must be replaced because it is removed with the old shingles. Basically it "depends".

I have two bits of advice:
1. Do not have the roof replaced during very cold weather. It's a job best done when the weather is nice. You don't want the workers rushing to finish quickly because they are cold, and the cold temps makes working with shingles more difficult. They become stiff and more brittle. After installation the roof needs to get hot to activate the adhesive patches that are underneath the tabs of each shingle. This glues the shingles together and greatly improves the shingles resistance to wind damage.
2. Have the old shingles removed if your budget allows. Most building codes allow you to have two layers of shingles on the roof. It is less expensive to simply put another layer on top of the old shingles but many think that two layers reduces the life of the shingles. Removing the old shingles also provides a perfect opportunity to inspect the roof sheeting and perform any needed repairs.

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