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There is simply not one single answer when it comes to knowing how much would it cost to replace a commercial roof. Replacement costs is a variable which is dependent on several factors.

If you are looking to take a shot at guessing an estimate, you will first need to understand the what is need for the replacement.

YOUR COMMERCIAL ROOF IS AGEING

The first sign of replacement is definitely the age. Generally, roofs come with a warranty of twenty years. Based on your materials, the real lifespan for a commercial roof tends to be around 15 to 25 years. Depending on the maintenance and the materials, lifespan can be prolonged.

YOUR COMMERCIAL ROOF LOOKS TIRED

Compare your commercial property with other buildings in the area. If it looks pale and worn out in comparison, it is high time for replacement.

WATER DAMAGE

A sturdy roof should be able to withstand extreme weather conditions such as heavy rain or high winds. However, if a storm has caused significant damage to your roof, its structural integrity might be compromised. water damage is one of the most indicative signs for a roof replacement.

CRACKS AND HOLES IN ROOFING MATERIALS

Proper upkeep of the roofing materials is required for it to continue protecting your property. If you find any cracks or holes, bent tiles or sheets, replacing them is advisable.

SAGGING COMMERCIAL ROOF

Roof replacement is critical when your roof suffers from sagging or corrosion. Once sagging or corrosion begins, the structure becomes vulnerable to damage.

Keeping all the above factors in mind, replacing your commercial roof can range from anywhere around £10,900 to £44,000 depending on the materials you choose. Materials are available in the market from £35 to around £75 per square meter. If you chose higher or premium quality materials, price can range from £115 to £200 per square meter.

How Much Are Roof Tiles?

The way your roof looks speak volumes about your home or property. When you have an attractive roof installed, you give a huge impression of how beautiful the interior of your house is.

Roof tiles are the prefect roofing material if you wish to have your house looking elegant and decent. However, what turns off most homeowners about roof tiles is the belief that the prices are not budget friendly. This is absolutely false and in this article, we’re going to give you a rough estimate of the cost of roof tiles.

The price of roof tiles includes the cost of removing and getting rid of the old roofing materials, the cost of purchasing new roof tiles in the market as well as the cost of installing them on your house. There are a plethora of factors that affects the cost of roof tiles. These factors include the height and size of the roof, the roof’s design, the roof’s pitch, incidental costs of labour, the company hired as well as your location. What’s more? A roof with a complicated design such as hips and valleys will also generally cost more than simpler ones. Also, if you happen to reside in a place like London with higher cost of living and greater demand, the cost is also likely to be higher than other regions. As a result, providing an accurate cost of roof tiles is simply not possible.

Generally, the cost of having an entire roof retiled will cost within the range of £10,000 to about £20,000. For a more accurate estimate, you’ll have to identify reputable roofing professionals within your local area and find the roof tile prices that perfectly suits your budget.

It depends on the material you use, but if your flat roof is installed correctly it should last for at least 10 years, and at least 20 if a material other than felt is used. Always question a roofing company when they quote to find out what materials they use and what guarantee's they offer.

How to repair a flat roof depends on the type of flat roof you have. We’ll talk about how to repair felt, asphalt, fibreglass and EDPM flat roofs yourself. But ultimately if you want the best finish, it’s best to ask a professional to repair your flat roof for you. Repairing a flat roof Whether you’ve got an old pour-and-roll type felt roof or a newer torch-on felt flat roof, you can get cracks, lifting around joints, leaks or dips. As a temporary measure, you can buy a special paint that you paint over cracks. For a more permanent repair, you can add a patch of torched-on felt or add a layer on top. Asphalt flat roof repair As your asphalt flat roof gets older, you may notice blisters, cracks or shrinkage and sagging around flashings. Again, you can use a paint on fix from a tin as a temporary repair, or add heat-applied flashing tape around flashing. For a more permanent fix you can use a liquid system, but many are only available to the trade market. You can also add a patch of torched-on roofing felt over a crack. How to repair a fibreglass (GRP) flat roof Fibreglass flat roofs are usually excellent, but problems can involve leaking flashing and cracks near upstands, trims or board joints. You can add acrylic sealant to cracks or holes for a good DIY repair, but a flashing problem is more difficult to fix. You’ll need to clean and sand the affected area of flashing, then laminate a 600g chopped strand mat into place, cure it and add a topcoat colour to match the roof. That sounds like a job better left to a specialist. EDPM rubber flat roof repair Rubber roofs often suffer from shrinkage when mechanical fixings haven’t been used near upstands, flashing leaks or holes or cuts. If you’ve got a small tear that you want to repair, you can add some lap sealant to the area – but use it sparingly. For a more permanent repair to flashing, buy some self-adhesive flashing that will mould into shape easily. Clean the area you want to repair, add EDPM primer, then stick the patch of flashing on from the centre outwards with a hard roller. You can add lap sealant around the edges if you want more protection from water.

Do You Need Felt Under Roof Tiles?

Before now, roofing felt were mainly incorporated to serve as a temporary waterproof roof on a building which would later on be changed for the permanent solid tiles or slate roof. This is due to the fact that rebuilding a roof can be time consuming taking a few number of days, the roofing felt would be used to protect the structure as well as the property it contains by acting as a barrier between the house and the harsh elements such as rain, wind, snow, sleet and more, while also providing minimal insulation until the structure is complete.

However those are in the olden days, in recent times, roofing felt ( also referred to as breathable roofing membrane or breathable felt) is now being used to create a safe and waterproof roof which is long lasting and will protect your house, properties as well as other outbuildings for a long period of time while also complying with the Building Regulations. So to answer the question - yes, you’re going to need felt under roof tiles as it has been made mandatory by building regulations.

Now let’s take a look at the different functions served by felt.

✓ You’ll need felt under roof tiles to prevent the roof space from being exposed.

✓ Roofing felt protects homes where a roof has not yet been installed to serve as a temporary protective layer against the elements.

✓ Roofing felt is particularly crucial for modern homes which are constructed to be more energy efficient and work to hold warm air from escaping the house. This is great to reduce your heating bills while also keeping both you and your loved ones cosy all throughout the year.

✓ Overall, building regulations imply that an underlay underneath the slate or tiles is now a compulsory requirement.

The task of installing a tile roof can be quite a difficult one. Such a project takes a great deal of preparation, well before the actual tile installation is done. It does not matter if you are putting new ones or replacing your old tiles, understanding the proper technique and steps become crucial.

Remove old roofing (if applicable).

This is, on its own, a major job that can take days and require special tools. It takes some time, but be prepared to do it right.

Install battens (if applicable).

Battens may be needed to hold the tiles in place if the roof is having a steep slope. Usually made of metal or wood, battens are generally 1 inch thick and run horizontally along the roof.

You can find several varieties of tiles that has a hook or a lip allowing it to hang on the available battens. Apart from this, you can find several clips in the market which help to attach the tiles on to the batten.

Determining the spacing for battens can be done easily using two tiles. To prevent interlocking, a three inch overlap is required at the minimum, and a smaller amount of overhang should be left over the eaves. Keep this in mind when you determine the locations of the battens.

After you have determined the distance between the first two battens, measure the distance and set battens using that spacing up, making sure to double-check measurements as you go along.

• Install the tiles.

• You will need to begin with one side first, and then continue to move along the length of the roof.

• Cut tiles to fit tight spots.

• Tiles have to be cut precisely to overcome any obstacle like the chimney.

• Install the ridge tiles.

After completing the broad surfaces of the roof, special ridge tiles are required to cap the top.

Fitting a Velux window into a slate roof is very similar to the way you’d install it in other roof types. All roof windows, whether a Velux-branded one or not, will come with detailed instructions for you to follow if you want to have a go at fitting it yourself. But here are some brief instructions to give you an idea of what’s involved in installing a Velux window into a slate roof:

1. After you’ve removed the Velux window from its packaging, remove the sash (the part that opens) from the frame, according to the manufacturer’s instructions.
2. Next, you need to prepare the opening for the window. You can often cut through the felt, remove one of the battens from under a slate, then slide all the slate tiles into the roof space. You should then make the cut 40-60mm wider than the window, cutting away roof timbers then replacing them with more around the opening to strengthen it.
3. The roof window’s bottom brackets need to be installed on one of the existing battens for the slate roof. One of the slate courses should line up 105mm below the top edge of the batten you use.
4. Then, measure from the top edge of the batten upwards to the height of the window plus 45mm. This is where the top installation batten should be installed, with an overhang of 100mm on each side.
5. Remove the course of slates below the window, trim any excess felt and fold it over the surrounding timber. This helps with waterproofing.
6. Add the insulation collar according to the Velux window manufacturer’s instructions.
7. Place the frame in the opening, adding the brackets according to the instructions. You’ll find that lots of roof windows have pre-drilled holes to make it easy for you.
8. Replace the sash and line up the hinges. Take a look at the opening at the bottom between the sash and the frame – it should be even along the entire width. Remove the sash again to fix the upper brackets according to instructions.
9. Add the underfelt collar for your roof window as instructed by the manufacturer, then replace any slates at the bottom. You might need to cut them to size.
10. Next, add the flashing according to the instructions, along with any parts that are not yet attached, including the hood section and top flashing piece.
11. Replace all the slates around the window, allowing 60-100mm of space between the course of slates above the window and the top of the window to allow for rainwater drainage. Then replace the sash into the frame again.
12. Add the vapour barrier on the inside of the window using the screws provided, then tape it to the existing vapour barrier to prevent moisture from reaching your roof structure.

And that’s it! If you think that sounds a bit complicated, ask a roofer or window installer to fit your roof window into a slate roof for you. You’ll get a better finish and you can be sure that you won’t get any leaks from a botched installation.

Competent Roofer is a scheme that allows professionals to self-certify that their work is in line with Building Regulations. If you don’t use a registered Competent Roofer, you’ll have to pay your local authority to certify the work, so we recommend you use a Competent Roofer to save yourself extra outlay at the end.