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How Much Is A Flat Roof Repair

Flat Roof Replacement Cost By Home Size

How to Repair a Flat Roof with Liquid Roof

The cost of replacing a flat roof depends on the size of the roof and the type of material used. A typical flat roof replacement costs between $4,300 and $19,100per 1,000 square feet, including labor and materials.

If youre not sure how large your roof is, heres a rough-and-ready formula you can use to estimate its size based on the square footage of your home:

Home square footage x 1.5 = Approximate roof square footage

We calculated total project cost estimates for several home sizes in the table below, based on the average rate of $9,000 for 1,000 square feet.

Home Size

Flat Roof Flashing Repair Cost

Repairing flat roof flashing costs $200 to $750. Flashing is a thin metal material used to seal the edges of the roof and prevent water damage. It is usually made from steel, copper, or aluminum and resists water and weather. However, it naturally wears down over time or may become damaged due to impacts in storms.

How Much Does A New Roof Cost

If you’re after flat roof replacement, you’ve come to the right place to find out all you need to know.

Surprisingly, most flat roofs are built with a little inclination to allow rainwater to drain into gutters therefore, most flat roofs aren’t flat!

Why you will find this guide useful…

This guide examines the costs of various roof replacements, including materials, labour costs and additional costs, as well as discussing how long it takes to replace a flat roof, the benefits and how much it costs to remove a flat roof.

This makes calculating the cost of a roof replacement simple for everyone.

So what are the factors you need to consider? Let’s explore this in further detail…

A flat roof might cost anything from £1,000 – £5,000 on average. This appears to be a large range, but it is due to all the elements that influence the flat roof replacement price.

Are there other things to consider and be aware of?

The cost of a flat roof, for example, may decrease or increase depending on the style of flat roof you choose.

Other considerations include the size of the house, the experience of the labourer, and the convenience of access to the roof. All of this is on top of other factors like scaffolding and so on.

Another thing to think about is the roofing material. Felt, rubber, fibreglass, and lead are the four most frequent materials used in flat roof construction.

If you choose a felt roof, for example, you may expect to pay between £40 – £70 per square metre.

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How Much Does A Flat Roof Replacement Cost In 2022

When a flat roof starts to show signs of wear and tear, its time to start thinking about a replacement. The average cost of a flat roof replacement is around $9,000 for 1,000 square feet, though typical prices can range from about $4,300 to $19,100. This price includes roofing materials and professional installation.

This price will vary depending on the size and type of flat roof, as well as your location. Keep in mind that this is just an average cost, and you may end up paying more or less depending on your specific circumstances.

Flat Roof Seam Repair Cost

Flat Roof Repair: Residential and Commercial

Expect to pay from $250 to $1,000 for professional seam repair on a flat roof. The seams of the flat roof can be its weakest point. This is where different sheets of material meet or roof parts connect. It is common for water to penetrate these areas more easily than other parts of the roof, potentially causing leaks and other damage. Seams may need to be treated with adhesive or sealing materials to repair them.

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Get Started On Your Flat Roof Replacement

Now that you have a good understanding of flat roof costs, its time to get started on your own project. At Legacy Service, we provide roofing installation and replacement services to homeowners throughout southeastern Pennsylvania, New Jersey, and Delaware.

Posted on May 7, 2022 in Roof

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A lot of elements play a role in maintaining the integrity of the roof, but as a homeowner, the most important components to pay attention to are the underlayment, ventilation, and material.

Flat Roof Vs Pitched Roof Cost

Flat roofs are less expensive than pitched ones, averaging between $7,000 and $10,500 for a flat roof and $7,000 and $12,000 for a pitched roof. While the initial cost may be cheaper, it is important to keep in mind that they will often require more maintenance which could cost more in the long run. Flat roofs dont drain well, leading to leaking, clogging, and repairs in the future. Pitched roofs last longer and require less maintenance over time. Ultimately, the decision between pitched or flat roofing comes down to personal preference.

Type of Roof
$7,000 â $12,000

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Average Cost Of Roof Repair By Material

Roof repairs, roof-overs, and partial replacements cost $250 to $3,000 per square , depending on the material.

Average roof repair costs by material


*Minimum call-out fees are $150 to $300.

  • Roof-overs can only be done once per building codes due to the weight.
  • High winds can lift the deck, causing broken seals and loose fasteners.
  • Shingles that are missing, brittle, buckle, curled on the edge, and shed loose granules need replacing to prevent leaks and water damage.
  • Uncleared snow causes ice dams, wood rot, leaks, and can block water and weaken shingles.
  • Excessive temperatures, UV rays, and trapped moisture cause cracks and curls.
  • A total replacement allows for inspecting the roof deck and sheathing.

Why Are Flat Roofs More Likely To Leak

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Flat roofs can be commonly found on top of commercial buildings and residential row homes in the DC Metro area. These roofs have very little grade or slope which causes water run-off to move slower compared to a standing seam metal installations. Flat roofs are more likely to leak due to the fact that they are unable to shed water as well as other roofing systems including slate tile roofing systems and shingle roof installations. Water does not drain as quickly, so there is more opportunity for water to pool and penetrate the roof membrane and seep into the roof system. Although your roofing system looks relatively flat from almost all perspectives, it is not actually entirely flat or at least shouldnt be. All flat roofing systems should be sloped between 1-10 degrees depending on your local building code. The slight slope should move water towards the drains and away from the walls and foundation of your home or building.

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How Much Do Flat Roof Repairs Cost

Patching small tears and other minor flat roof repairs cost $300 to $600. Repairing storm damage, rerouting drains, and other major overhauls could cost over $1,000. Remember to regularly take a close look at your roof for tears, holes, and leaks. Promptly addressing these issues through DIY repair or by contacting a flat roof repair pro near you is the best way to extend the life of your roof.

Commercial Flat Roof Replacement Cost Per Square Foot

Depending on the material, commercial flat roofs typically cost between $4 and $9 per square foot to install. Most of them are much bigger than residential roofs, with 10,000 square feet being the average. Owners of commercial buildings can expect to pay between $40,000 and $90,000 for their flat roof depending on the material type as well as the need for drains, vents, and extra underlayment.

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Why Does My Ceiling Leak When It Rains

Common causes of roof leaks are related to plumbing as well as AC units. However, if youve never had a leak before except when it rains, its likely do to a roofing issue. This is also another common cause of a leaky roof. When gutters are clogged, water builds up because it has nowhere to go.

Is it OK to use tar for roof repair?

Its every homeowners worst nightmare its raining and there is water leaking inside your home. Roof repair and roof replacement can seem like an invasive and expensive dilemma, causing many homeowners to want to simply patch the leak with a bucket of tar.

Where to use tar to stop shingles from leaking?

Spreading roofing tar works best where the shingles are leaking around flashing. You brush or spread it on manually and can be used anywhere that a spray-on sealant is used. The tar fills cracks, crevices and separations around flashing.

What Are The Advantages Of Flat Roofs

4 Types of Flat Roof Coatings

If youre unsure whether a flat roof is the right option for your home, it may help to know some of the excellent benefits of these roofs. The advantages of choosing a flat roof include:

  • Price – Flat roofs are cheaper than pitched roofs, perfect if youre on a budget.

  • Installation – Because flat roofs are less complex than pitched roofs, theyre quicker and easier to install.

  • Use – You may be surprised to know you can actually use a flat roof for a range of different functions. You could add a balcony, a rooftop garden or even an entirely new room.

  • Light – If your home is quite dark, you can install skylights or roof lanterns on your flat roof, flooding the space with light.

  • Solar panels – Flat roofs can also be used to support solar panels, helping power your home using sunlight.

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How Do You Maintain A Flat Roof

Pitched roofs, if not self-maintaining, are close to it. The roofs tilt and gravity take care of many issues. By contrast, flat roofs need frequent maintenance. The more maintenance, the longer the roof can be expected to last.

Walk the flat roof several times a year to make sure that the drains are clear and that water is draining away. Sweep or blow leaves away. Look for low spots that collect water.

Broken limbs that may glance off of a pitched roof will hit the flat roof dead-on with full impact, so check carefully for damage after a big windstorm.

Flat Roof Average Costs #

The actual cost of a flat roof depends on your location, the materials used, the complexity of the installation, and other factors.

  • Building a flat roof costs approximately $6.00 to $10.00 per square foot. Assuming an average roof size of 1,500 square feet, that’s a total cost of $2,250 to $15,000. A commercial building roof averages over 10,000 square feet so expect to pay $60,000 to $10,000 for a complete flat roof replacement.

  • Asphalt roll roofing costs $4.00 per square foot installed .

  • Built up roofing costs $5.00 to $6.50 per square foot installed .

  • Single ply rubber/plastic roofing costs $6.50 to $8.00 per square foot installed.

  • Spray-on roofing costs $4.50 to $7.00 per square foot installed .

  • Standing seam roofing costs $5.00 to $10.00 per square foot installed .

  • Removing and disposing of your existing roof might add $1 to $4 per square foot to the total flat roof installation cost.

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What Is The Best Material For A Flat Roof

The best material for a flat roof depends on your preferences and needs. For example: If you live in a colder climate, youll want to search for the best flat roof replacement material in cold temperatures. Get in touch with a local contractor to schedule a consultation and find out which one would work best for you.

Why Will Flat Roofs Leak

How Much Does It Cost to Replace a Flat Roof? ROOFING QUICK TIPS

Sometimes improving drainage systems to get water off the roof faster, will solve the problem. Standing water on top of a roof is a major problem. The longer water is on your roof, the more likely it is to find somewhere to leak into your property.

What are the most common repairs for a flat roof. How much does the average repair to a flat roof cost?

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Flat Roof Repair And Replacement: How To Save In 2022

Despite the name, flat roofs arent flat but pitched at a small angle. If they were completely level, water would pool on the surface of the felt, degrading the material and leading to leaks.

Flat roofs are common across the UK, particularly on garages and extensions, largely due to their low cost. However, theyre notorious for leaking, so you should be prepared to either patch or replace your roof every 15 years or so.

Maintenance costs shouldnt be that expensive, and your roof should keep out the weather for years to come. But, beware of the all too common bodge jobs these wont only damage your bank balance, but your home too.

This article will go over all the important factors you need to know when it comes to repairing and replacing your flat roof, from how much it costs to repair or replace a flat roof, what affects the cost of repairing or replacing a flat roof, how to save money on repairing or replacing a flat roof, whats involved in repairing or replacing a flat roof and how to find and hire a roofer.

For our top tips on roof repair, keep reading to find out the most cost-effective way of getting the job done.


£90 to £105 per square metre 1 to 2 days

For a standard felt roof, expect to pay between £40 and £60 per square metre for replacement material. If you have opted for a rubber roof, this cost will rise to be between £60 and £85 per square metre.

Why You Should Replace Your Flat Roof

Flat roofs, while possessing some advantages over sloped roofs, are susceptible to leaking in ways that sloped roofs are not. One of the critical weaknesses of flat roofs is the tendency to develop pooling. Pooling is defined as a condition in which water remains on a flat roof for more than 48 hours. This can significantly shorten the lifespan of a roof or, even worse, the structural integrity of the building itself.

Some signs can help you know when to replace your flat roof and take the necessary action. The design of a flat roof makes it unique, and it may need extra care after it has served you for a long time. The flat roof is made in such a way that it cannot allow water to seep into the house. However, if the flat roof is in a poor state, it can let in water easily.

Some of the specific signs you should look out for to know that it is time for a flat roof replacement includes the following:

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How Much Does A Flat Roof Cost

Let’s take a look at average costs…

The average cost of a flat roof is anywhere from £1000 to £5000. This seems like a rather wide range, but this is due to all the factors that affect the price.

For example…

Depending on the type of flat roof you opt for, the price could either reduce or increase.

There are other factors to consider, including the size of the house, the labourers expertise, and the ease of access to the roof. This is all in addition to other considerations like scaffolding and so on.

The material used on the roof is one other factor to consider. There are four most commonly used materials in flat roof construction:

For instance,if you opt for a felt roof, you can expect to spend between £40 to £70 per m2.

Its worth noting that…

… Replacing a flat roof can fluctuate in cost as it’s affected by several factors, which we’ll discuss in more detail. The most crucial factor is the size of the house and what section you want the flat roof placed in.

For example, a flat roof for a one-bedroom apartment is between £1500 to £3000.

Also, note that this is assuming the flat roof will act as the main roof. However, if you are on a budget, you could use the flat roof for a section of the house like the garage, in which case, the price could come down to somewhere between £700 to £1000.

You also need to consider this!

What Makes A Roof Repair More Expensive

Flat garage roof repair in Burnley

If the damage to your roof is particularly widespread, for example if a tree has landed on your roof and a large section needs to be replaced, the job will be a lot more expensive than if its just replacing a few tiles. Especially if a roofer needs to erect scaffolding to allow proper access, the repair costs can stretch to several thousand pounds.

If the roof project will take a few days, then a temporary cover can be errected to cover the property so the roofers can work on the roof without having to worry about the weather. This will be an additional cost on top of the scaffolding.

Complex roofs, with different levels, or multiple features like chimney stacks and dormer windows, can add more complexity to a project, adding time and money. For more information on chimney costs, take a look at our guide on chimney repair pricing.

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Is Standing Water On A Flat Roof Ok

After any rainfall lands on a flat roof, water will begin to pool. On a performing flat roof ponding water is not a problem as it will drain, or even evaporate, away. However when your flat roof has uneven areas due to sagging, an insufficient slope, or drainage issues, the ponding water doesn’t dissipate.


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