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How Much Flat Roof Cost

Cost Of Resealing A Flat Roof

Flat Roof estimate and how we price a new flat roof.

A complete tear-off and replace of a flat roof can cost anywhere from $2,500 to more than $11,000. Resealing your current roof can extend its life and avoid replacement. How often you need to do this will vary depending on the type, brand, coating thickness and climate.

For example, a cheap acrylic may need work every 10 years. High-end silicones often come with 25 or even 50-year warranties. Though Polyurea has only been around for about 30 years, manufacturers often claim this type of sealant to be the longest wearing.

Fluctuations in temperature cause expansion and contraction, add to that humidity levels and UV rays all wearing on your roof. The best way to know how often you’ll need to reseal is to talk to your roofing contractor. Ask them what type of roof to use for your climate and how often you’ll need to reseal.

Cost Of Removing A Flat Roof

If you want to convert your roof, you will need to have your flat roof completely removed. It may be that you have no choice due to consistent leaking or rotted timber decking, which will require you to remove your roof. The average cost for professional removal is around £80 per square metre, although this will depend on the material used, as some may be harder to remove than others.

You will also need to consider waste disposal costs which usually amount to £100 if a tradesman is removing it for you, if you need to hire a skip expect to pay around £200 to £1,000 for skip hire.

What Are The Benefits Of Grp For Flat Roofing

Whilst GRP is a useful material for all roofs it is particularly beneficial to flat roofs because:

Easy installation: GRP products are cold-laid . This eliminates a certain level of risk to both the GRP roofing installers and anybody else on the site.

Low insurance: because GRP roofing systems are cold-applied, they do not attract the high levels of insurance premiums that other roofing materials which require hot installation do.

Durable & waterproof: GRP flat roofs are not only very durable, but they are also 100% waterproof this gives them the edge over other materials that may have traditionally been used for flat roofing.

Low maintenance: Due to the nature of GRP, the entire GRP area of the roof is one huge GRP membrane this eliminates the need for seam joints or welds, along with the consequential maintenance.

UV resistant: GRP roofing is entirely UV resistant.

Adaptable: GRP forms a very adaptable roofing system, which easily allows for new features such as balconies or a walkway on the roof area. You could also easily add extras such as roof lighting.

Leak-free: The overall and largest benefit of having a GRP roof installed, however, is that as long as it is correctly fitted, it should remain leak-free for life. A particular advantage to those with flat roofs, who may encounter leaks more frequently.

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Flat Concrete Roof Cost

Flat concrete roofs average in cost between $4 to $8 per square foot. If you are looking for a roofing material that you can rely on for many years, concrete is one of the best options. Flat concrete roofs have many pros, including hassle-free maintenance, high durability, and the ability to withstand harsh weather conditions. With the pros come a few cons, including leakage problems and plant growth. This type of roofing material can last for over 50 years. Concrete is generally low maintenance and very durable.

Average Cost Of Roof Trusses By Size

How Much Does A Flat Roof Cost?

You can expect to spend between $30 and $270 per truss based on their size. There are several sizes of trusses, and they will have different prices. Prices differ because of the size, materials needed, and the durability that the truss provides. For example, while cheaper on average, an 18-foot truss will not provide the same support as a 40-foot truss. In the table below, you will see a breakdown of the average costs of roof trusses based on their size, as represented by the most common sizes.

Truss Size
$200 – $300

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Roof Inspection Checklist Before Repairs

A roof inspection works in a preventive way, allowing you to protect your roof from deteriorating while saving you money from expensive future repairs. Adding at least one yearly reminder in your calendar to identify and fix any problems will save you a lot of trouble.

Its not always easy to tell if your roof needs a complete replacement or just some minor repairs done. Remember, re-roofing is much more expensive than a simple repair. If your roof looks bad, dont jump into re-roofing planning just yet. Take a look at the chances of possible repairs to put it back in good condition. If youre not sure whether your roof needs total replacement or just several repairs, you should contact a trusted local roofer about it. This will save you time, money, and effort in the long run.

Fiberglass Flat Roof Cost

A fiberglass flat roof averages between $4 and $8 to install. Fiberglass is a newer roofing material that works well for both pitched and non-pitched roofs. It is installed using panels that are installed on the roof overlapping each other. Most times, fiberglass roofs are double layered. This type of roof is popular due to its cost and water-resistant properties. A fiberglass roof is much more durable than other materials and lasts for 25 plus years. A few disadvantages include the installation is based on the weather, and they arent recommended for larger roofs.

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Pitched Or Sloped Roofs

Most pitched roofs are asphalt shingle or tile where complete coatings are not recommended. However, there are some exceptions and considerations when dealing with a pitched roof.

  • Metal: such as in residential settings, can use an elastomeric coating for corrosion resistance or just to extend the life of the roof. You’ll usually pay an additional $1.00-$2.00 per square foot since the coatings must be applied in multiple thin layers.
  • Asphalt Roll: For small leaks and tears, elastomeric bitumen sealants run between $15 to $20 per gallon or about $6 to $10 per 10-ounce tube. Use repair fabric in conjunction with these sealants. Fabrics will cost about $10 for a 25-square foot roll.
  • Asphalt Shingle: Only use bitumen or elastomeric sealants around flashing, vents and skylights. Using complete coatings on asphalt shingles is a short-term fix and may actually do more harm than good. Repairing or replacing your damaged asphalt shingles is the long-term solution. Replace any underlayment and damaged roof sheathing as well. Considering that installing a new asphalt roof costs an average of $3,700 and a new tile roof costs an average of $11,500, the price of repairing asphalt shingles as a solution is well worth the investment.

If you’re still set on coating shingles, you may want to try one of these options:

Size Of The Flat Roof

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

Size matters. This is not only because of the material, but also the amount of labour required and the time needed to finish the project. As mentioned earlier, a felt roof could cost somewhere £40 to £70 per m2, and this means the total cost of the roof will depend on how large it is.

For instance, the price of installing a flat roof on the entire house would be significantly more than just doing the porch roof. Apart from materials, since larger roofs take more time, the labourers are likely to cost more money.

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How Much Does It Cost To Replace Or Repair A Flat Roof

No matter how professionally a flat roof is fitted, there will come a time when it begins to fail, leaking at first, but eventually bowing in and in danger of collapse. When you see signs of leaking, you should consider repairing or replacing the roof, putting things off will not fix the problem, but will make it worse and more expensive!

As to whether you should repair or replace the roof, that depends on the roofing material and the amount of damage. Funnily enough flat roofs are generally built with a slight incline to allow rainwater to drain off into gutters, so basically most flat roofs arent actually flat!

The average cost of replacing a flat roof is usually in the range of £700-£1,300 depending upon what materials the roofer uses, whether or not scaffolding will be needed, and the size of the roof. There are numerous flat roof applications which have varying costs, including:

  • Felt roof
  • Rubber roof
  • Fibreglass roof
  • Lead bay roof
  • Fibreglass bay roof

Most roofers operate in pairs and will typically charge around £200-£300 per day. Usually, the job will be completed within a single day, and the roofer should always come back the next day to ensure there are no leaks.

Cool Roof Coating For Reflecting Heat

Coating a roof with white helps reflect solar radiation, reducing cooling costs by reducing indoor air temperature by as much as 20+ degrees. Acrylic, silicone, polyurea and EPDM all come in white. However, silicone tends to lose its reflective abilities faster than other types of roofing.

If you are sealing a pre-existing roofing membrane you may only need one coat. This can reduce costs an average of $0.50 to $1.50 per square foot.

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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.

How Much Will Your New Flat Roof Cost

How Much Does Replacing a Flat Roof Cost?

Too many factors go into the cost of a flat roof replacement or any roof replacement to give you an exact price. However, I can give you a general idea of how much your new flat roof will cost.

A good rule of thumb is to budget between about $6.00-$9.00 per square foot for a smaller membrane flat roof and about $5.00 per square foot on slightly larger projects. Be aware, if you use insulation thats thick enough to insulate the entire structure, it will cost more than just using fabric insulation and gluing the membrane to it.

On the other hand, a 24 gauge steel standing seam metal flat roof will cost around $15.00 per square foot. This number could be more or less depending on the size of your flat roof, the number of penetrations, the roofing contractor you hire, and other factors.

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Bay Window Roof Replacement Cost

To replace a bay window roof with architectural asphalt, you can expect to spend $398 for a 12 square foot perch.A typical bay window is 7 feet wide, and your bay window roof will extend 24 from your wall. Add another 6 inches for the roof to extend over the front of the window. The chart below shows the price for architectural asphalt shingles, clay tile, and copper roofing.

Bay Window Roof Replacement Cost

  • Pay for permits

Flat Roof Replacement Cost

The process of flat roof replacement involves tearing off the existing roof and replacing it with a brand new roof. The average cost for roof replacement is around $7,000 to $12,000. A new installation involves installing a new roof and tearing off any existing roofing, which costs between $7,000 and $10,500. While replacing your entire roof can be quite pricey, there are many benefits to consider, including correcting any issues at one time. Repairing certain areas may cause other areas to require repair in the future, so replacement may help save money in the long term. Roof replacement improves the curb appeal of a home and can be a good investment for selling.

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Flat Roof Material Prices

The cost of a flat roof is influenced by the material selected, ranging between $4 to $30 per sq.ft. installed. Many materials are available to choose from that differ in their pros, cons, lifespan, and cost and are known for their installation process, structural integrity, and ability to withstand harsh weather. You can expect to pay more for an EDPM roof compared to a GRP roof. The table below lists the most popular types of materials available and their respective costs, followed by an explanation of each.

Flat Roof Material
$4.50 – $10.50

Downfalls And Common Problems With Flat Roofing

Flat Roof Repair – Cut Cost without cutting corners

There are a few downsides to flat roofing too.

For one, they offer less insulation potential than traditional roofing . There isnt as much room to add in material to shield your building from the elements. This can lead to poor protection from outside temperatures during extreme weather.

Some flat roofs do have a slight pitch – or angle – to account for water drainage. But this isnt always enough to prevent pooling in the instance of heavy rain or snow. Eventually, this can result in deterioration. This is why periodic inspections are vital. Be sure to regularly clear your draining system to prevent excessive pooling.

Debris pile up is another problem to look out for. Leaves, dust, pine needles, and more can collect on your flat roof. This can lead to blocked drains and, eventually, pooling.

Over time, your flat roof may crack and warp. This is a problem in and of itself but it can also result in leaks. This is another reason to perform frequent inspections to your flat roof. If you do catch a problem spot, be sure to resolve it as soon as possible.

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How Much Does Tpo Roofing Cost

Though its sold in rolls, TPO roofing is often priced by squares, like most types of roofing. A square is 100 square feet of roofing material, and your TPO roofing cost estimate may be quoted in squares. Experts find that one square foot of TPO roofing can range from $3.50 to $14.00. That would mean a square of TPO could range in price from $350 to $1,400. Theres a wide variation in price that reflects the different thickness options available for TPO roofing.

TPO Roofing Cost Calculator

Faq About How Much Does It Cost To Replace A Roof On A 2

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The article Top 3 Flat Roof Materials Explained Torch Down, EPDM, TPO Which is the best? is summarized by me and the team from many sources. If you see the How Much Does It Cost To Replace A Roof On A 2 article helps you, please support Team Like or Share!

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Sagging Roof Repair Cost

Sagging roof repair costs $800 to $2,500 to replace sections of roof decking and shingles up to 100 square feet. Fixing minor sagging roofs may only require additional support like rafter ties. Severe cases may require a full roof replacement and replacing rotted rafters.

Cost to fix sagging roof

  • Adding a new structural ridge beam or rafter ties
  • Installing a new roof

Sagging roofs are dangerous and require an inspection and design plan from a structural engineer costing $300 to $1,000. Higher costs apply for sizing a beam replacement.

Common causes for sagging roofs:

  • Excess weight Snow, ice, debris, or multiple layers of shingles stress the roof structure.
  • Water damage Moisture weakens the roof and causes beams to rot.
  • Pests Termites in the roof deck, rafters, or sheathing weaken the supports.
  • Old age Wear and tear of the roof sheathing or rafters have shifted out of place.
  • Improper installation Wrong-sized rafters and beams or improper installation cause structural failures.
  • Improper ductwork Contractors who remove too much of a homes framing structure when installing ductwork can cause rafter damages and sagging.
  • Structure damage Load-bearing walls with structural problems cause sagging in the area above the wall. Houses that have simply settled may only need a few shingles to hide the minor sag.

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Roof Repair Vs Replacement


Your roof could still be in good condition, and not show any signs of leaking, but if it is 20 years old or older, you can prevent an extensive amount of damage to the interior of your home and its contents by having someone come out to assess the situation. According to building supplies manufacturer Owens Corning, the following is a list of signs you’re roof needs to be replaced:

  • Shingle edges are curled, or shingle tabs are cupped or cracked.
  • Bald spots where granules are missing
  • Your roof is at least 20 years old.
  • The roof looks old and worn.
  • Dark streaks from airborne algae
  • Moss

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