Sadly, shingling over an existing roof is still permissible by the building codes in most areas of the country and many roofers consider it a common industry practice. To the average unsuspecting homeowner, the finished shingle-over roof may look OK, and the price will certainly be enticing.
Is it bad to overlay a roof?
A: In general, it is not good practice to overlay a traditional asphalt shingle roof versus a complete tear off and replacement for the very reason you stated: you can’t examine the decking to determine if there is any damage that needs repaired.
How long will an overlay roof last?
On average, an overlay lasts around 16 years. That said, for most shingles, the warranty is valid for the same length of time whether the shingles were used in an overlay or a tearoff.
Is it OK to put a new roof over an old one?
The answer is yes, you can lay new roof shingles over old ones. … You can’t do it with wood or slate, for example, and you should never mix materials, such as laying asphalt shingles over cedar shakes. Also, the old roofing has to be in pretty good condition.
Is it OK to shingle over an existing roof?
You might be able to lay new shingles over existing shingles and avoid the cost of tear-off. If conditions are right, new shingles laid over old shingles can be just as attractive and durable as shingles laid on bare sheathing. … But you must take care to install shingles correctly so they lie flat.
How much does it cost to overlay a roof?
THE COST OF A ROOF DEPENDS ON MANY FACTORS
On average, reroofing a house could cost between $5,000-$12,000, but prices are dependent on many different factors.
Is it OK to put 2 layers of shingles?
Two layers of shingles trap more heat, which in turn damages the shingles and shortens the life span of the roof. … Adding a second layer could compromise the structure of your roof. Problems fixing leaks: A second layer of shingles only complicates the job when a roofer is trying to fix a leak.
Is it better to tear off old shingles?
While a repair job can often be more convenient and somewhat more cost-efficient, placing new shingles over old ones is never a good idea. Whether repairing one section of roof, or a replacing a whole one, it’s always best to pull up the old shingles before putting down the new ones.
How many times can you reroof a house?
In general, this is the recommended replacement schedule based on the material used: Composition Shingles: 12-20 years. Asphalt Shingles: 15-30 years. Wood Shingles: 20-25 years.
How long does it take to reroof a house?
In general, the roof of an average residence (3,000 square feet or less) can be replaced in a day. In extreme cases, it could take three to five days. Depending on the weather, complexity, and accessibility of your home it could even take up to three weeks.
Can I reroof my house myself?
The truth is, anyone can replace their own roof, with the help of the many DIY websites. For residential houses, roof replacements typically take two days – the first day to remove the old roof, and the second day is to install the new one.
Can I put 3 layers of shingles on my roof?
House roofs should never exceed three layers of shingles. Adding additional layers without excavation can save homeowners up to $1,000 in labor. Therefore, layering has advantages. … High quality asphalt shingles are the best roofs to install multiple layers on.