Can you put a new roof over an old 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.

Is it better to put a new roof over an old one?

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 long does a roof overlay last?

An overlay is a viable option if the existing roofing materials have not already been overlaid. Home Reference.net notes that on average you can expect the overlay to last for fifteen or sixteen years.

Is it OK to put a second layer of shingles on a roof?

A second layer of shingles will decrease the integrity of your new roof and lower its lifespan. That's because shingles aren't designed to have a second layer of shingles on top of them! Plus, all that extra moisture and heat being applied to the first layer of shingles will make that first layer age faster.

How many times can you shingle over a roof?

In most states, you're only allowed to have 2 layers of shingles on a roof for fire safety reasons. However, you'll still see roofs that have 3 or 4 layers today. If you already have 2 or more layers, a contractor will recommend a full replacement.

Can You Install A New Roof Over Old Shingles?

Is a roof over a good idea?

Conclusion. Reroofing is a great option for those who don't need a complete roof replacement, who have a generally good roof that is at the end of its life cycle or a roof that is slowly losing its function.

Is a roof overlay worth it?

In the long run, an overlay roof is likely to cost more than a complete tear-off and re-roof installation project. That said, an overlay roof will save you money upfront, and can be done more quickly if you're on a time crunch.

Is it cheaper to shingle over an existing roof?

It's more affordable.

Simply adding another layer of shingles doesn't require as much labor as it would take to remove them first. Therefore, labor costs are much lower for overlay roofs.

Can I build a roof over my roof?

The answer is Yes. You can put new shingles over existing shingles that are in good condition. However, you can only install new shingles over asphalt shingles that meet the re-roof conditions. Also, you cannot mix materials; for instance, you cannot install shingles over wood tiles or slate.

Is it necessary to remove old roof shingles?

Finally, if you have an older home and already have two layers of shingles in place, you'll likely need to remove shingles before adding a new layer to prevent the roof from getting too heavy. In these cases, removing shingles and starting fresh is a good investment.

What is the difference between re roof and new roof?

Roof Recover: The process of installing an additional roof covering over a prepared existing roof covering without removing the existing roof covering. Roof Replacement: The process of removing the existing roof covering, repairing any damaged substrate and installing a new roof covering.

Is it bad 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.

What are roof overs?

A roof over is placing another roofing material over the existing one. It is done to add an extra layer of insulation and protection to reinforce the roof of your house. A roof over helps save money since you don't need to replace the roof of your house entirely.

How much does it cost to add a layer of shingles?

On average, you can expect to pay a contractor $3 to $6 per square foot to install your roofing. Prices can be higher if you choose a unique or complex shingle. The contractor will have to dispose of shingles, which costs an extra $25 to $150.

Can you put new plywood over old on a roof?

As long as the new plywood itself can span the distance and carry the roof, wind, seismic and snow loads for your region, adding new ply over old is just fine. The new plywood thickness should be at least equal to the exusting plywood thickness.

Can you put rolled roofing over old rolled roofing?

Rolled roofing is very adaptable and can be cut into 12-inch by 36-inch strips to act as hips and ridges or 9-inch strips for eaves and rakes. If removing your current shingles is a problem, it is usually permissible to re-roof over your existing roof with rolled roofing.

How often should roofs be replaced?

Knowing when a roof was installed (and what it's made of) offers insight into how much life it has left. For instance, a typical asphalt shingle roof lasts 20 to 25 years, while a roof installed over an existing layer of shingles should be replaced after 20 years.

Is it better to repair or replace a roof?

Depending on the type of roofing material used, its age may be a good indication of when to replace a roof. If your roof is showing signs of aging and/or has suffered storm damage, leaks, or other problems, it may be a good idea to consider replacing it.

When should you reroof?

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.

Can you put a new roof on in the winter?

Yes, your new roof can be installed in the winter.

But usually, we have a chance to install roofs 52 weeks out of the year, including during the winter months. Now, if you live above the snow line, it'll be different because of the colder temperatures and the likelihood of more snow.

Can you redesign a roof?

Changing the pitch of a roof is only possible when a roof's internal and structural materials are also replaced. When a roof's ridges, walls and rafters are switched out, there is a chance to create a new architectural design that can change the pitch of the roof.

How much does it cost to change the shape of a roof?

The costs of changing a roof pitch can depend upon numerous factors but will be anywhere from $15,000-$20,000 on average – large and complex roofs may cost more. Replacing the frame entirely – common in roof re-modelling – means switching out the ridges, walls and rafters too so it's a major project.

How does it cost to replace a roof?

The national average cost to replace a roof is around $8,000, with most people spending in the range of $5,500 to $11,000. The two largest variables you'll deal with on a job like this are the square footage of your home (and thus, your roof), and the type of roofing material you choose.