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 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.
Do I need to 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 shingles over shingles?
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.
How much does it cost to put a second layer of shingles on a roof?
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 many times can you shingle over a roof?
Depending on the type of roof material used, the number of layers added to a roof range from two to three times. House roofs should never exceed three layers of shingles. Adding additional layers without excavation can save homeowners up to $1,000 in labor.
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.
Does flashing go over or under shingles?
Instead of installing the step flashing between shingles, the flashing rests on top of the shingles. It’s not unusual to see sealant installed when sidewall flashing is missing. Sealant will eventually dry, shrink and crack. You’ll see sealant substituted for flashing in a lot of different areas on roofs.
Will black shingles make house hotter?
Black and dark-colored roofs.
In general, dark-colored roofing materials will absorb the heat and cause your attic and/or the top of your house to be warmer than a lighter colored material.
Can you put asphalt shingles over wood shingles?
The only advantage of laying asphalt shingles over wood shingles is that it won’t take as long and won’t cost much compared to getting a whole new roof. However, this isn’t recommended since it can do more harm than good.
How hot does it need to be for shingles to seal?
Shingles won’t seal unless they warm to an ambient temperature near 70 degrees. That doesn’t mean it needs to be 70, because solar radiance will heat the shingles even if temperatures are in the 40s. However, springtime can be a challenge due to rainfall.
Should I tear off old shingles?
In most cases, more than two layers of roofing shingles does require a tear-off. Laying new shingles over old shingles is easily prone to leaks and reduces the life of the new shingles. This alone ought to be reason enough to do a tear-off; it’s just a bad value not to.
Can you put architectural shingles over 3 tab shingles?
In most cases, you can apply a second layer of three-tab shingles over an existing roof that features three-tab shingles without having to tear off the existing roof. However, you cannot apply three-tab shingles over architectural shingles.