Some roofers install a layer of waterproof shingle underlayment (WSU) over the existing shingles at the eave end, as would be done for a roof laid on bare sheathing. This provides added protection against ice dams. Asphalt shingles can be laid over cedar shakes or shingles, a job best left to pros.

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Also know, is it OK to shingle over an existing roof?

The answer is yes, you can lay new roof shingles over old ones. But before we get started, one thing must be clear: adding new roofing over old (sometimes called a "re-roof") is possible only with asphalt shingles (also called "composition shingles").

Additionally, how many layers of shingles can you put on a roof? two layers

Subsequently, question is, can you put rolled roofing over shingles?

Roll roofing is made from the same asphalt composition material as shingles, and it's easier to install. You can install roll roofing directly over a single layer of existing roof covering, but if there are already two coverings, you must remove both.

How long does a reroof last?

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. Climate and weather conditions, such as snow, hail and hurricanes, can cut the life span of all types of roofs.

Related Question Answers

Can you put plywood over old shingles?

The existing asphalt shingles need replacement, so he plans to do a tear-off and re-shingle. Because the plywood roof sheathing under the shingles has become brittle and weak, he plans to install new plywood as well as new shingles. The new plywood will have to be nailed to the rafters or roof trusses.

Can I reroof my own house?

If you absolutely need a new roof to lower your energy bills and keep water and wind out of your house, but you cannot afford it, talk to a professional roofer. Installing a new roof yourself is not encouraged. If you are handy and have some roofing knowledge, then most likely you don't even need to read this article.

What are the steps to roofing a house?

Seven Effective Steps on How to Roof A House
  1. Identify Local Building Codes and Obtain Permits.
  2. Find The Roofing Material You Need.
  3. Remove Old Roof (for Pre-Constructed Roofs)
  4. Install Drip Molding and Flash Roof Valleys.
  5. Use Chalk to Mark Nail Spacing.
  6. Apply Roof Adhesive on Exposed Nails.
  7. Let Dry and Enjoy Your New Roof.

What is the difference between re roof and new roof?

Re-roofing is the process of layering new shingles on top of already existing ones. If re-roofing is not an option, then your next option is a complete roof replacement. Roof replacement can be done at any time but especially if there are problems with the roof deck.

Does flashing go over or under shingles?

This is true no matter what type of roof-covering material is installed. Flashing should overlap the roof-covering material, but on asphalt shingle roofs, for aesthetic reasons, the part of the headwall flashing that extends down over asphalt shingles is often covered with a course of shingle tabs.

How much does it cost to fix a roof?

It costs from $1.20 to $4 a square foot to remove and replace the roof or $1,700 to $8,400 for a typical 1,700-2,100 square foot ranch-style home, with a gentle slope. The cost per square foot for a wood shingle roof is between $6.37 and $8.77.

What does flashing do on a roof?

Roof flashing is a thin material, usually galvanized steel, that professional roofers use to direct water away from critical areas of the roof, wherever the roof plane meets a vertical surface like a wall or a dormer. Flashing is installed to surround roof features, such as vents, chimneys and skylights.

Should you remove old shingles roof?

If any areas of the roof have become severely damaged, it's usually better to remove the old shingles and start from scratch. If you're going to add a roof on top of an old one, it's a good idea to remove any loose shingles and apply a new layer of 30-pound roofing felt before laying the new shingles.

How do I get homeowners insurance to pay for a new roof?

How to Get Your Homeowners Insurance to Pay for a New Roof
  1. Review your Policy. First and foremost, check your homeowner's policy to ensure that coverage for roof repair or replacement is available.
  2. Assess the Damage.
  3. Contact your Insurance Agent.
  4. Contact Roofing Companies.
  5. File a Claim.

How do I know when my roof needs to be replaced?

Potential signs that your roof may need to be replaced:
  1. Shingle edges are curled or shingle tabs are cupped.
  2. Bald spots where granules are missing.
  3. Cracked shingles.
  4. Your roof is at least 20 years old; while many shingles today are produced for durability, many factors can accelerate the aging of shingles.

How long does it take to install a new roof?

How long does it take to replace a roof? Replacing a residential roof is a labor-intensive project and, depending on the type of roof, could take anywhere from a one day to a few days or more depending on the size and complexity. The time involved is substantially affected by the weather, as well.

How do you nail down roll roofing?

Nail the roofing in place with short roofing nails spaced 6 inches apart and 1 inch in from the outer edges of the roll roofing. Add a second piece of full-width roll roofing over the first. Nail it in place with roofing nails spaced 6 inches apart and placed 1 inch from the edge.

How much is a bundle of shingles?

Retail price for 25-year, 3-tab shingles is about $25 to $30 per bundle, plus tax. You need three bundles per square, so the total price is around $75 to $90 per square. For architectural shingles, the retail price jumps to about $33 to over $52 per bundle, or $100 to $160 per square.

Do you put drip edge before tar paper?

The best way is to install the roof drip edge only along the eaves first, then place ice-and-water barrier (in the snowbelt) or felt paper (underlayment) over the drip edge. This lets any water that gets on the roof run down the underlayment and over the drip edge.

When should I use roll roofing?

Rolled roofing material is often used on roofs that are low-sloped. If your roof pitch declines up to 1 inch vertically for every 12 inches horizontally (1:12 pitch), it is a good candidate for rolled roofing as long as you use the concealed nail method of fastening.

Can architectural shingles be roofed over?

The standard practice was that you could install a new layer of singles directly over the old layer during a re-roof. 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).

How many layers of shingles are allowed on a roof in Colorado?

Two layers

Is it OK to put a metal roof over shingles?

Metal Roofing Can Be Installed Over Existing Roofs Metal roofs can be installed over your existing roof without tearing off shingles, provided local building codes allow it. While shingle removal is the preferred route, tear-off is messy and raises the cost of the job.