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Is it OK to put shingles on top of old shingles?
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.
Should you remove old shingles before installing new 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.
Can you put 2 layers of shingles on a roof?
As mentioned above, homeowners are legally limited to two layer of roof shingles. Therefore, if you already have two layers, you’ll need a full tear-off. Additionally, if your roof is severely damaged, it likely won’t be able to support the weight of a reroof and will need to be torn off.
Is it OK to overlay shingles?
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.
Why are multiple layers of shingles bad?
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.
Can you reroof over architectural shingles?
The quick answer is yes you can re-roof architectural shingles over existing architectural shingles (however you must check with the shingle manufacturer as well).
Can I lay roof felt over old?
Many people ask if you can felt over old felt. We would advise stripping the roof so that you can inspect and repair the roof timber before then laying down a new layer of roofing felt.
How do you remove old shingles from a roof?
How many layers of roofing can I put on my house?
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. Building and city codes require roofers to limit shingle layers to two.
How long does a 2 layer roof last?
Roofs. Slate, copper and tile roofs can last more than 50 years. Homeowners with wood shake roofs should expect them to last about 30 years, while fiber cement shingles last about 25 years and asphalt shingle/composition roofs last about 20 years, the NAHB found.
How long will a 2nd layer of shingles last?
Shorter lifespan – As you might expect, new shingles laid over damaged shingles and rotting decking won’t last as long as they could. To make matters worse, a roof with two layers of shingles holds in more heat, which speeds up deterioration. On average, an overlay lasts around 16 years.
How much does it cost to overlay a roof?
On average, reroofing a house could cost between $5,000-$12,000, but prices are dependent on many different factors.
What is a roof overlay covering?
An overlay roof, or the process of overlaying a roof, occurs when a roofing technician puts another set of roofing materials directly on top of the existing roof. Roof overlay isn’t the most common method of roofing repair or replacement but it is one option.
How do I put a roof over my existing roof?
Roofing over an existing roof is also called reroofing or an overlay. It is the process where roofers install a new roof over your existing one, i.e. add a new layer of shingles, which means that there is no tearing off of the old roof.
How long does an architectural shingle roof last?
Lifespan. Because of their durability and high-quality composition, architectural shingles generally have a longer lifespan than the 3-tab variety. They stand up better to weather conditions such as heat, snow, ice, rain, and strong winds. Their average lifespan is about 18 to 20 years.
Can you overlay 3-tab shingles with architectural shingles?
If you’ve already got 3-tab shingles, you might be able to overlay with architectural ones while leaving them in place. This will cost less, as you won’t have to tear off and start again.
Should you install a metal roof over shingles?
It’s absolutely fine to install a metal roof over shingles. People are accustomed to thinking of metal roofs as being heavy or cumbersome. In fact, metal roofs are so beneficial because they’re very light. They’re fast to install, and they come in large sheets rather than individual tiles.
Can you put synthetic underlayment over old felt?
Fact: GAF representatives have stated that layering over old felt underlayment doesn’t void their basic warranty, because the basic warranty only guarantees that the materials will arrive onsite in good condition.
Can you overboard a felt roof?
11mm OSB is fine for overboarding onto a solid deck And if the felt isnt in to much of a state and is fairly flat then the drippers can be removed (felt around the edges of the roof and wall upstands if any) and u can then overboard being sure to find and hit the joists with your screws..
Do I need underlay for felt roof?
You can increase the lifespan of new shed felt by using a method that is also used to protect the roofs of other buildings and structures when they have a pitch of less than 20 degrees. To use this method, you will need to use an underlay, which will need to be put in place before you install the shed felt.
What is the easiest way to remove shingles?
Standing at the peak, use a garden fork or a specially notched roofing tear off shovel to tear away the ridge caps and the top courses of shingles. Get one on Amazon. Some roofers prefer forks because they don’t get caught on nails, making it easier and faster to remove the shingles.
How hard is it to remove shingles?
Although removing asphalt shingles requires less roofing knowledge and training than the installation of the new layer, it is still a lot of work. Maybe you’re not afraid of hard work, but also remember you’ll be working on a sloped surface, using tools you likely have never used before.
