If applying a glass fibre felt underlay, make sure this is partially bonded using Black Jack Roof Felt Adhesive. Ensure the felt is lapped, sealed and that there is plenty of ventilation underneath. You can then apply Black Jack Roofing Coating and a glass membrane where needed. Applying To Asbestos Cement Sheeting. Bituminous felt is a form of waterproof sheeting that is used to cover flat roofs, or as an underlay beneath slate or tile roofing. The substance itself is made from bitumen which comes from the distillation of crude oil that has been either mixed with sand or crushed limestone. Laying Roofing Felt. The Everbuild Black Jack Roof Felt Adhesive - 5 Litre is a cold applied, oxidised bitumen based adhesive used to bond roofing felt to most surfaces. Specifically designed for bonding all types of roofing felt to metal, concrete and timber, sealing felt laps and as a cold gritting solution for bonding mineral chippings. It has a high bond strength and is also suitable for gritting.

1. How To Use Bitumen Roof Felt Adhesive - Blackjack Remover
2. How To Use Bitumen Roof Felt Adhesive - Blackjack Tape
3. How To Use Bitumen Roof Felt Adhesive - Blackjack Home Depot

1. Bitumen Roof- Advantages. There are several different advantages to using a bitumen roof on your building or home. Unlike some newer types of roofing, it has a long, proven track record that can be counted on. Bitumen roofs are one of the longer lasting types of flat roofing materials, easily lasting 20 years or more.
2. BLACK JACK ROOF FELT ADHESIVE is a cold applied, black oxidised bitumen-based adhesive used to bond roofing felt to itself, concrete, asphalt, metal, wood and similar surfaces. Also suitable for use as a cold gritting solution. Benefits High bond strength Also suitable for gritting Areas for Use Bonding all types of roofing felts to metal.

Bitumen roof paint is probably one of the cheapest and easiest repairs you can make to a flat roof. It really couldn’t be more simple, and it’s an easy DIY task for most homeowners as long as as you can work safely at height. First lets take a look at the materials involved.

1. First I would always recommend a primer
2. Second is a good bitumen roof paint
3. I would also recommend a solar reflective coating
4. Optional is a scrim

Bitumen flat roof paint – In case you haven’t seen it, in this video I show you how to apply a waterproof bitumen paint coating to a flat roof.

About bitumen waterproofers

Bitumen paints are probably the cheapest and easiest of all the paint on, or brush on waterproofing paints. The first thing required is a clean dry surface, and I highly recommend the thinnest coat of bitumen primer as a base. Bitumen roof paints usually come in either water based, or solvent based varieties. Having used both I consider solvent based to be the best option most times, not only does it dry faster for recoating if necessary, but it’s waterproof quicker, therefore rainproof faster.

A bitumen sealant will bond and adhere to most things including, built up felt roofs, asphalt, concrete, asbestos or cement sheeting and metal sheeting including lead, zinc, galvanised steel and iron. Oh and slate roofs believe it or not.

Bitumen paint coverage

You can expect a bitumen based roofing sealant to cover 1 metre per litre, per coat. The flat roof in my video was 12m², took two coats, and used nearly the whole 25 litre drum.

Bitumen roof paint longevity

So how long can you expect a bitumen coating repair to last on a flat roof. Well this really depends on your flat roof. If it has multiple movement cracks and is still prone to excess movement, lets say the timber underneath is slightly rotten, it will have a detrimental effect. I’ve seen this repair last 12 months, and I’ve also seen it last well over 5 years, 10 in some cases. Of course you can implement a scrim or simply apply two coats, and solar reflective paint which will also help. And of course there’s nothing to stop future subsequent coats of roof sealant.

Bitumen primer coverage

When using a bitumen primer the game is to get it on, and then spread it out nice and thin with no puddles or thick spots. Coverage will be a bit random depending on roof cracks or absorption, but you can expect between 4 to 6m² per litre.

Solar reflective paint

Adding a Solar reflective coating to a flat roof that has been sealed with a bitumen roofing sealer really serves two functions. First it keeps off the UV light, this stops premature drying out and damage of the sealant. Secondly it reduces heat build up, not to mention the finished roof looks a lot better. Dont worry about the overly shiny silver look when fresh, this will dull down to a pleasant grey in about 2 or 3 months. In coverage terms it goes a long way at about 5 to 10m² per litre.

Roofing scrim

I would say the vast majority of flat roofs that get bitumen coatings do not receive a layer of scrim. That’s reflected in how hard scrim can be to purchase, even in very good roofing yards. It’s also I think overpriced at about £80 per roll. In the video I used Cromar glass fibre scrim, although other scrims also work. A scrim really comes into it’s own when the roof has multiple splits as found in seriously degraded built up roofing felts.

Also see

• Flat roofing materials – Have a look at a potential new roof
• Flat roof replacement costs – Price up your roof here
• Flat roof repairs – Other flat roofs and possible repairs

Contents

• 2 Step-by-step guide for felting a flat roof

If you’re looking to protect the flat roof of your shed or other outdoor structure from the natural elements, there’s no better way than by laying down felt on the roof.

While felting a flat roof is not a particularly complex project, it does require some patience and perseverance to make sure that the felt goes on smoothly and evenly. This is a good DIY weekend project, requiring only a few basic materials.

Materials for felting a flat roof

In order to lay felt on a flat roof, you will need to gather the following materials and tools:

• Ladder
• Utility knife
• Tape measure
• Trowel
• 30-pound roofing felt (also known as #30 roofing felt)
• Plywood planks
• Galvanized nails
• Roof felt adhesive (e.g. bitumen)

In terms of materials, please note that there are several different weights for the roofing felt. This guide will use the more durable #30 roofing felt, although you can use #15 felt.

Step-by-step guide for felting a flat roof

Follow the 10 steps below in order to felt a flat roof.

Step 1: Measure the roof

You can either measure the roof from the ground or by standing on a ladder and actually going up on the roof. You will then need to measure the length and width of the roof. Multiplying these two together will give you the square footage of the roof.

As part of this project you are using three different layers of felt, so be sure that you then multiply this square footage by three. This will tell you how much roofing felt you need to lay.

Step 2: Prepare the roof

You must remove any rotted pieces of wood on the roof and replace them with your plywood planks. Also, you will need to remove any old felt on the roof, as well as any nails or roof staples. This is done to ensure a flat surface for the roof felt.

Step 3: Lay down felt and secure to roof

Roll your felt out on the roof and cut it to fit with a utility knife. Roll the felt so that it overhangs the edge by 2 inches. Let it stand for about 30 minutes and then, using galvanized nails and your hammer, nail down the first layer.

In terms of spacing, leave about 6 inches between nails along both of the short sides and the side lying next to the edge of the roof. As you secure the roof felt to the roof, make sure that it lies even and straight.

One way to do this is by starting your nailing in the center and working out – this allows you to pull the felt snug as needed.

Step 4: Repeat until roof is covered

If your roof is larger than just a single layer of felt, you will repeat the process in Step 3 until the entire roof is covered. As you roll out each additional layer, make sure that there are at least 2 inches of overlap.

This means that you will be nailing both the original layer and the overlap layer along the edge of the felt that is parallel to the roof edge. When the final piece of felt is added, you will need to make sure that all 4 sides (not 3, as in the earlier rolls) are secured to the roof.

Step 5: Prepare the second layer

The key to weatherproofing your flat roof is adding a total of 3 layers; thus you will repeat the earlier steps. Before adding the second layer, though, spread a thin layer of adhesive on the first layer using your trowel. This will help the two layers adhere to each other.

Step 6: Add the second layer

You are now ready to place the second layer of felt. Cut it with your utility knife so that it lies correctly and fits the roof, AND so that it will overlap the first layer by 2 inches. This overlap is needed to ensure a tight, weatherproof seal.

You can either walk over the roof to remove any air bubbles between the two layers or use your trowel to ensure a smooth, exact fit.

Step 7: Prepare the third layer

You are now ready to lay another roll of felt on the roof. As before, you will need to place adhesive on top of the felt.

Step 8: Add the third layer

Now you are ready to roll out the third layer of felt. Cut it to size with your utility knife and place it over the second layer.

Be sure that there are 2 inches of overlap with the previous layer, and that some felt covers the edge of the roof. Now place the third layer on top. As before, you will need to make sure that there are no air bubbles between layers.

Either walk over the felt with your feet to ensure a tight, secure fit or pat it down with your trowel. At this point, you will now have three different layers of felt secured to the roof.

Step 9: Final roof treatments

Now, spread some adhesive on top for maximum weatherproofing effect. You can now cover the surface of felt with gravel for added strength and durability.

Step 10: Clean up

You’ve now completed the felt roof installation! All that’s left to do is a final cleanup of materials from the roof. Dispose of any waste – such as old felt or used nails – in an environmentally-friendly way.
https://youtu.be/dnw5soRrEy0

How To Use Bitumen Roof Felt Adhesive - Blackjack Remover

Safety tips for flat roof felt installation

Any time you are working on a roof and using a ladder, you must practice good safety. This includes taking extra steps to ensure that you always have at least one hand free as you go up and down your ladder to the roof.

How To Use Bitumen Roof Felt Adhesive - Blackjack Tape

If you are thinking about refelting a roof or replacing a layer of felt, take care that you use the appropriate type of roof felt and adhesive.

Conclusions on felting a flat roof

How To Use Bitumen Roof Felt Adhesive - Blackjack Home Depot

Laying down felt on a flat roof is an easy and effective way to improve the strength and durability of an outdoor structure like a garage or shed. By placing three even layers of felt and taking great care that there is enough overlap and that any seams don’t create a straight line, you can ensure that your flat roof will be optimally weatherproofed.