Question 1

How much does it cost to replace a commercial flat roof?

Accepted Answer

If your commercial flat roof needs replacing, how much it costs will depend on how big the roof is and what you want it to be made from. Lots of commercial flat roofs are made from felt or asphalt, but people are also beginning to turn to materials like EDPM rubber and fibreglass. Flat roofs can last a long time, but if it’s been 20 years or more since you had it replaced or inspected, it might be time for a new one. If a roofer inspects it and finds lifting, flashing problems, sagging or lots of blisters, it’s probably time to replace your flat commercial roof. So how much does it cost to replace your commercial flat roof? The average cost is around £4,500, but it could be much less or much more. It depends on how big your roof is and what material you choose. Felt is the cheapest material you can use for your commercial flat roof, at around £40-70 per metre squared, while a lead bay roof will cost the most at £90-110 per square metre. EDPM rubber and fibreglass roofs are being used more and more because they’re so durable, and they will cost between £80 and £110 per square metre. It might be worth spending a little more upfront to get a stronger and longer-lasting commercial flat roof.

Question 2

What is commercial roofing?

Accepted Answer

Commercial roofing simply refers to any roofing work, including installation and repair, that is done to commercial buildings. This might include office roofs, shop roofs or commercial unit roofs. Every building needs a roof to keep out the rain!

Since looks aren’t usually the first priority with commercial buildings, lots of commercial properties have flat roofs. These are often made from felt, EDPM rubber or fibreglass. Felt is the cheapest commercial roofing material, while fibreglass tends to be the most expensive. In felt roofs, roofers use an adhesive to stick roofing felt onto a frame. EDPM rubber roofs have a rubber membrane that is laid down and glued onto the roof and coated with a contact adhesive, while fibreglass uses a cut glass fibre mat that is pressed on before a resin and topcoat are applied.

Not all roofing companies will offer commercial roofing services, because generally the buildings tend to be bigger. Small companies won’t have enough tradespeople to work on a roof without making it very expensive for you. Commercial buildings also tend to need more scaffolding to make it safe for the professionals to work, so some smaller roofing companies won’t offer commercial services. Make sure you check a company’s website or social media if you’re looking for commercial roofing – on the Quotatis Directory, our roofers will show whether they do commercial roofing to make your search easier.

Question 3

What is the best commercial roofing material?

Accepted Answer

The best commercial roofing material for your building will depend on the size and type of roof you have as well as your budget. A lot of commercial buildings have flat roofs, but some have pitched roofs. These days, flat roofs are almost flat, but are usually built on a small slope so water can drain effectively. Pitched roofs are much steeper and are made using tiles or shingle. Our top choices for commercial flat roofs would be fibreglass or EDPM rubber. Both of these materials will set you back around £80-110 per square metre, making them some of the most expensive flat roof materials, but they’re strong and durable. A fibreglass roof consists of a cut glass fibre mat that is pressed on the roofing frame, then resin is poured and rolled over the roof before a topcoat is applied. An EDPM roof involves laying an EDPM rubber membrane on the roof surface then gluing it down and coating it with a contact adhesive. For pitched commercial roofs, our top material would be concrete tiles or metal. Concrete tiles will set you back anywhere between 40p and £2.90 per tile and they’re long-lasting and fire-resistant. However, they are heavy and can be susceptible to high winds. Metal roofs have been used for over 50 years and today’s modern systems are extremely strong and allow for structural or thermal movement. Aluminium roofs will cost between £40-75 per square metre, plus installation. These days, flat roofs are almost flat, but are usually built on a small slope so water can drain effectively. Pitched roofs are much steeper and are made using tiles or shingle. Our top choices for commercial flat roofs would be fibreglass or EDPM rubber. Both of these materials will set you back around £80-110 per square metre, making them some of the most expensive flat roof materials, but they’re strong and durable. A fibreglass roof consists of a cut glass fibre mat that is pressed on the roofing frame, then resin is poured and rolled over the roof before a topcoat is applied. An EDPM roof involves laying an EDPM rubber membrane on the roof surface then gluing it down and coating it with a contact adhesive. For pitched commercial roofs, our top material would be concrete or clay tiles. Concrete tiles will set you back anywhere between 40p and £2.90 per tile and they’re long-lasting and fire-resistant. However, they are heavy and can be susceptible to high winds. Clay tiles cost as little as 50p to £2 each and can last over 50 years, but they are heavy so if your commercial roof isn’t already, it will need to be reinforced.

Question 4

How much does it cost to replace a commercial roof?

Accepted Answer

How much it costs to replace a commercial roof depends on the type of roof you have and the size of your commercial property. Lots of commercial buildings have flat roofs, which are often made from felt, asphalt, EDPM rubber or fibreglass, while others are pitched roofs that might be made from tiles, shingle or metal. It’s likely that your commercial roof will need replacing if it’s more than 25 years old. A roofer can carry out an inspection to determine what, if any, work is needed, but there’s a high chance that you’ll need a roof replacement if it’s that old. If your flashing is looking worse for wear or you’re missing a number of tiles or shingles, it might be time to replace your commercial roof. So how much does it cost to replace a commercial roof? If your commercial roof is pitched, expect to spend between £4,500 and £7,500. It all depends on how large your property is and how easy access is, as the more scaffolding you need, the more it will cost. If your commercial property has a flat roof, the average cost would be approximately £4,500. Again, it all depends on the material, access and how large the roof is. Felt costs between £40-70 per square metre, while fibreglass costs between £80-110. Whatever type of commercial roof you have or what it’s made from, make sure you get a few quotes from reputable roofing companies so you know that the job will be done well.

Avg. price low	Avg. price low £2,375
Avg. price	Avg. price £4,000
Avg. price high	Avg. price high £5,375

	Labour cost	£3,500
	Material cost	£1,250
	Waste removal	£250

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