Modified Bitumen

RUBEROID® HW Plus Granule membrane is designed for new roofing and re-covering applications, as well as the construction of flashings. RUBEROID® HW Plus Granule membrane is also a suitable product for repairs of built-up roofing membranes or
other modified bitumen systems.

Advantages:
Lighter weight — installed roof designs weigh less than 2 pounds per square foot.

Durability — specially formulated modified asphalt gives RUBEROID® HW Plus Granule membrane lasting performance.

Resilience — the RUBEROID® HW Plus Granule membrane’s premium polyester mat core helps resist splits and tears due to its pliability and elongation characteristics.

Flexibility — specially formulated poly burn-off film allows for easy installation.

Product warranties and system guarantees are available. Contact your local sales representative for requirements, availability, and limitations.

SBS Modified Bitumen 2 Ply system

Base Layer options

Mechanically attach to Wood

Torch Down to Fiberglass Base or to overlay current Modified membrane. Optional

Top Layer

Regular SBS (styrene-butadiene-styrene) Synthetic Rubber option

Heavy Duty SBS Option

Applying to Wood Decking (new replacement)

If you are applying the first layer to Wood….then we Recommend installing the Base Layer as Fiberglass

When installing modified bitumen over a wood roof, the typical layers would be: a wood deck, a base sheet of modified bitumen (adhered to the deck), and a cap sheet of modified bitumen on top of the base sheet; essentially, a two-layer system with a base and a cap layer, although depending on the project, additional insulation may be added between the wood deck and the base sheet.

Key points about these layers:
- Wood Deck:
  Ensure the wood deck is properly prepared with no significant gaps or cracks, and meets the manufacturer’s specifications for thickness.
- Base Sheet:
  This is the first layer of modified bitumen, usually self-adhered directly to the wood deck. Can use Fiberglass option and then add an additional base of sbs smooth (see above)
- Cap Sheet:
  The final layer of modified bitumen, typically applied using a torch to melt and seal the seams. (see the Granular SBS above)
  Optional Layer – Insulation:
- Insulation Layer: If additional insulation is needed, it is usually placed between the wood deck and the base sheet of modified bitumen.
- This is a good option to insulate your property and offers excellent drainage options
.

Applying over existing Modified Butimen roof

Yes, you can torch down a new layer of modified bitumen directly over an existing modified membrane, as long as the existing membrane is in good condition and properly cleaned; this is a common practice in roof repairs where you want to add an extra layer of protection to a modified bitumen roof system.

Key points to consider:

Membrane compatibility:
Ensure the new modified bitumen membrane is compatible with the existing one.
Surface preparation:
Thoroughly clean the existing membrane to remove dirt, debris, and any loose granules before applying the new layer.
Proper torch application:
Use a propane torch to properly heat the underside of the new modified bitumen sheet to create a strong bond with the existing membrane.

- Optional Layer – Insulation:
- Insulation Layer: If additional insulation is needed, it is usually placed between the wood deck and the base sheet of modified bitumen.
- This is a good option to insulate your property and offers excellent drainage options
.

Applying over existing EPDM

To torch down modified bitumen over EPDM, thoroughly clean and prepare the existing EPDM surface, then carefully roll out the modified bitumen sheets, using a propane torch to melt the adhesive backing on the bitumen, allowing it to firmly adhere to the EPDM; ensure proper overlap and sealing of seams by continuously moving the torch along the sheet while applying pressure to create a watertight bond; always follow manufacturer instructions and safety protocols when working with a torch on a roof.

Key points to remember:

Preparation is crucial:
Clean the EPDM surface to remove dirt, debris, and any existing adhesives that could interfere with bonding.
Primer application:
Depending on the manufacturer’s recommendations, you may need to apply a primer to the EPDM surface to improve adhesion.
Torch technique:
Use a propane torch to heat the back of the modified bitumen sheet, ensuring even heat distribution to melt the adhesive properly.
Overlap and sealing:
Overlap the sheets according to the manufacturer’s specifications and carefully torch the seams to create a watertight seal.
Safety first:
Wear appropriate protective gear like gloves, eye protection, and fire-resistant clothing when working with a torch.

Potential concerns:

Material compatibility:
While it is possible to torch down modified bitumen over EPDM, some concerns exist about potential long-term compatibility between the two materials, so consult with a roofing professional and check manufacturer guidelines.
Heat damage:
Excessive heat from the torch can damage the EPDM membrane, so proper technique and controlled heat application are essential.

Roofing Membranes Comparison

TPO (Thermoplastic Polyolefin)

Single Ply made with blend of ethylene propylene rubber and polypropylene
Easy to install and Great Seam Strength due to Heat Weld capability and adhesives
Energy Star Rated
Fungal and mold resistant
Durability that lasts
Resistance to mold, punctures, and tears.
The heat-reflective properties of TPO help reduce energy consumption, making it an eco-friendly choice for savvy property owners.
Available in multiple colors including white
25-30 Years

Modified Butimen

2 Ply system with a Base Sheet and typically we use this for Overlays
Asphalt membranes with polymerized rubber or plastic and is reinforced with fiberglass
Ideal for overlay on Tar or asphalt roofs
Heat resistant
Puncture a tear resistant
Typically last less years than TPO or EPDM

EPDM (Ethylene Propylene Diene Monomer)

Single Ply made with synthetic rubber material
Easy to install
Bit more expensive than TPO
Durable that lasts
Resistant to punctures (not as good as TPO, PVC and Mod Bit)
Black color (limited color choices but does have white)
Not as UV resistant as other membranes
20-25 years

PVC

Good on punctures
Great initial flexibility, due to the addition of plasticizers
Great seam strength due to heat-welded seams
Highly reflective – white
Very chemical-resistant compared to other membranes
Good warranty programs
Bleed-out during welding confirms the quality of the weld visually