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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 options

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. 
    • 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