What is mod rolled roofing

Modified bitumen (modified asphalt) or “mod bit” roofing material is sold in rolls and applied usually on low-slope or flat roofs. Its seams are sealed using a torch to heat the under-side of the bituminous material that coats both sides of a polyester or fiberglass reinforced mat.

Can you walk on modified bitumen roofing?

Can you walk on a modified bitumen roofing system? Yes. Well-installed MB roofing is designed to withstand foot traffic. For areas that support building equipment or heavier foot traffic, the roof can be appropriately reinforced.

What is the difference between TPO and EPDM?

EPDM has a dark surface, which in summer conditions will absorb heat, forcing cooling systems to work overtime, whereas TPO roofing reflects sunlight, allowing commercial air conditioners to work more efficiently. TPO also has a somewhat higher resistance to punctures than EPDM.

What lasts longer EPDM or bitumen?

Long lifespan (reaches 50 years) When it comes to the service life, EPDM is the clear winner. We mentioned earlier that it lasts up to 50 years.

What is the difference between mod bit and rolled roofing?

Probably the easiest way to tell just by looking is the seams, the asphalt rolled roofing will have plastic roof cement in the seams, the mod bit will have melted tar squeezing out of the seams.

Is modified bitumen the same as asphalt?

Modified bitumen is one of the most common low-slope roofing systems. Not to be confused with similar materials like asphalt roll roofing, EPDM, or TPO, modified bitumen combines hot asphalt with plastic and rubber additives. They are then layered between sheets of polyester or fiberglass.

How wide is mod bit?

The finished mod bit sheets are typically 39 inches (1 meter) wide and sold in rolls. The rolls are typically between 25 feet and 33 feet (10 meters) long.

What does SBS roofing stand for?

With SBS roofing, the asphalt is modified to form a polymer network inside the bitumen. SBS stands for styrene butadiene styrene and gives the bitumen a rubber-like characteristic. This results in better resistance to aging and weathering.

What are three common installation mistakes on modified bitumen roofing?

Seams facing up the slope.
Inadequate overlap of seams.
End seams not staggered.
Inadequate fastening of the membrane to the decking.
Poor sealing at seams and flashings.
Inadequate drainage.

What is a SBS roofing system?

SBS modified bitumen roofing is a material made out of asphalt and synthetic rubber, making it an exceptionally flexible material for flat roofs. … This material works best on low-slope commercial roofs, and many manufacturers use glass, polyester, or composite reinforcements.

Article first time published on

Is modified bitumen roof good?

Modified Bitumen Roofing Systems are designed to withstand harsh exposure to extreme environmental elements. With five layers of protection, it’s one of the most trusted flat roofing systems used in the industry today.

Does modified bitumen tear?

Because of the added fiberglass or polyester, modified bitumen has a high tensile strength, which makes it resistant to tears and hail. It also holds-up extremely well in areas with high foot traffic. In the rare case modified bitumen does tear, it is quickly and easily patched with bitumen patches.

How do I stop my flat roof puddling?

If the roof sags or has small uneven areas these need to be levelled. This very easy to apply DIY flat roof levelling compound kit comes with everything you need to pack in the dip and seal with a waterproof coating. You can even create slopes with it to navigate water towards drainage exits!

What is the best flat roof covering?

EPDM Membranes Quite possibly the best flat roofing membrane, EPDM is a relatively low-cost flat roof material that offers a number of significant advantages. Clean, straightforward installation, incredible strength, a long lifespan, and a smart finish combine to make EPDM membranes a difficult one to beat.

What is better rubber or felt roof?

Rubber roofing like EPDM is considered a far superior product than traditional felt thanks to the wide range of benefits on offer. It’s one of the highest quality materials for flat roofs and is incredibly easy to install. The result is a robust, waterproof and durable roof that won’t tear, rot or blister.

Is EPDM better than torch down?

Torch Down Rubber roofs will outlast any other roof system by 30 years and more if installed correctly. Due to marketing tactics, EPDM roofs became more popular than Torch Down roofs. It is harder to find roofing contractors that know how to install Torch Down Roofs.

Which roof is better EPDM or TPO?

EPDM roofs are the most economical choice for single ply roofing membranes. TPO roofing membranes are more expensive than EPDM. Regardless of which membrane you choose, it is better to spend more money and invest in a thicker membrane. Both EPDM and TPO roofs perform better and last longer if they are thicker.

Is a TPO roof good?

There are a plethora of benefits to implementing a TPO roofing system onto your current commercial roof. It has great strength, durability, and flexibility. That means being able to stand up to a build-up of dirt, resistance to tears, and mold growth as well. Perhaps its best trait is that it is energy efficient.

How do I know if I have EPDM or TPO?

If possible remove a staple so you can look at both sides of the roofing material. If one side is a white or a dove color and the other side is black it is EPDM. If the roofing material is all one color, top and bottom, it is TPO.

Can roll roofing be installed over shingles?

Q: Can I install roll roofing over shingles? Yes. The reason is simple: both roll roofing and shingles are a composition of the same asphalt material.

How is modified bitumen roofing applied?

Modified bitumen is typically applied by heat (torch) welding, cold-process adhesive, or self-adhering membranes. … SBS stands for styrene-butadiene-styrene, a form of synthetic rubber used in modified bitumen.

What is roll roofing material?

It is similar to asphalt shingles but is an oil-based asphalt product that has a mineral surface and comes in a large roll. It is known as an “MSR” which stands for mineral surface roofing.

How long do modified bitumen roofs last?

It is important to notes that modified bitumen roofs have a solid roof lifetime of approximately twenty years. This is an estimate that does not include good roofing maintenance.

What does modified bitumen roofing look like?

A modified bitumen roof generally consists of two layers: a base sheet and a cap sheet. The base sheet is often self-adhered to the roofing substrate. The cap sheet is either torched down, cold adhered, or self-adhered (Modified bitumen can also be applied in hot asphalt).

Is modified bitumen a membrane roof?

Membrane roofs are most commonly made from synthetic rubber, thermoplastic (PVC or similar material), or modified bitumen. Membrane roofs are most commonly used in commercial application, though they are becoming increasingly common in residential application.

What is the difference between roll roofing and modified bitumen?

Modified bitumen is approved for “flat” roofs with minimal slope, but roll roofing is not viable below a 2/12 pitch (two inches of rise for each twelve inches of horizontal run) with exposed nails, or a maybe little lower with concealed nail installation.

What is mod bit made of?

BUR: Built-Up and Mod-Bit: Modified Bitumen Built-Up roof membranes (BUR) and Modified Bitumen (Mod-Bit) are generally composed of alternating layers of bitumen and reinforcing fabrics that create a finished membrane.

What is the difference between built up roofing and modified bitumen?

Modified Bitumen (MB) roofing is an asphalt-based, close cousin of the Built-up-Roof (BUR) designed for buildings with low-slope or “flat” roof structures. … Modified Bitumen roofs give designers and installers an even broader array of options than BUR.

Is a sloped roof waterproof explain?

Explain. Sloped roofs are not waterproof. They are designed to shed water like a series of umbrellas. … The pitch of the roof is the slope, usually expressed as a ratio of the rise over the run.

Should inspectors walk on concrete roofs quizlet?

No the Standards do not require you to walk on the roof. The roof covering is typically part of the home’s structure.

Why should open valleys widen at the bottom?

There are two reasons the valleys should widen at the bottom. 1. Lower sections of the roof see more water than upper sections. Lower sections of valleys also see more water than upper sections.