If two layers already exist, you’ll need to remove the old layers before installing a new layer of shingles. Physically inspect the entire roof to determine the soundness of the wood roof decking, which is under the shingles. Identify any areas in which the roof deck is damaged or deteriorating.
Can you put a second layer of shingles on a roof?
“Can I put a second layer of shingles on my roof?” You can, but you probably shouldn’t! Known as a layover, putting a second layer of shingles on your roof is in most cases inadvisable and a job that Proven Roofing is likely to even turn down.
Can you put new shingles on top of old ones?
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.
How much does it cost to put a second layer of shingles on a roof?
A one-story roof with a single shingle layer costs between $100 and $150 per square to remove; a double layer, $115 to $165; and triple layer, $125 to $175. If you have a particularly high roof or one that is extremely steep, you will pay more per square.
How much does a second layer of shingles cost?
ft. The cost per square depends on the type of shingles and the brand. They generally range between $55 on the low end and $600 on the high end, with an average of $100 to $250 per square of architectural shingles. The roofing labor cost per square is $100 to $250.
How long does roof overlay 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.
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 I put new roof felt over old?
It’s best to tear down to the bare roof deck so you can also check for any decking damage. But you can also add another layer of felt on top of existing. This will add additional thickness to the roof, so be sure that fasteners (nails) are long enough to penetrate both layers.
Can you put plywood over old shingles?
The new plywood will have to be nailed to the rafters or roof trusses. … But, with the old plywood left in place, it will be considerably more difficult to locate the rafters to ensure proper nail placement.
How much does it cost to shingle a 1000 sq ft roof?
Average Cost to Replace a Roof by House Size
|House (& Roof**) by Square Foot||Re-Roofing Cost*|
|1,000 (1,054)||$4,000 – $5,500|
|1,100 (1,160)||$4,200 – $6,000|
|1,200 (1,265)||$4,500 – $6,500|
|1,500 (1,581)||$5,500 – $8,000|
How much does it cost to tear off and replace shingles?
On average, it costs from $1.20-$4 per square foot to tear off and replace a roof with asphalt shingles. For a 1,700-2,100 square foot ranch-style property, that costs about $1,700-$8,400. However, roof replacement costs increase when you use higher-end roofing materials.
What is the problem with more than two layers of shingles?
Warranty issues: Most shingle warranties do not apply when shingles are layered over existing roofing, according to InterNACHI. Two layers of shingles trap more heat, which in turn damages the shingles and shortens the life span of the roof.