BEC Roof System – 3 Ply Hybrid Roof System With Type II or Kettle Grade Rubberized Asphalt
- I ply of 3.0 mm rubberized, 180 gram polyester reinforcement base sheet in solid moppings of type II asphalt or rubberized asphalt
- I ply of 3.0 mm rubberized, 180 gram polyester reinforcement base sheet in solid moppings of type II asphalt or rubberized asphalt
- I ply of a 3.0 mm, 180 gram polyester reinforced, rubberized base sheet
- Base flashings – 2 plies of 3.0 mm rubberized, 180 gram polyester reinforcement base sheet in solid mopping s of type II or rubberized asphalt
- All layers adhered withType II asphalt or kettle grade rubberized asphalt
- Floodcoat of Type II or kettle grade rubberized asphalt applied at the rate of 70 lbs. per square and gravel surfacing applied at a rate of 650 lbs per square
- 24 gauge, pre-painted sheet metal details
- Vapour Barrier – self adhesive, rubberized polyolefin faced vapour barrier fully adhered on a primed metal deck
- Base course of insulation – 2.5” polyisocyanurate insulation adhered in approved quantities of foam urethane adhesive
- Intermediate course of insulation – 2.5” polyisocyanurate insulation adhered in approved quantities of foam urethane adhesive
- Top course of insulation – 1/2 inch, asphalt saturated fibreboard adhered in a solid mopping of type II or rubberized asphalt
BEC – 3 PLY RUBBERIZED BASE SHEET ROOF SYSTEM – RUBBERIZED ASPHALT – ROOF SYSTEM SCHEMATIC – SYSTEM 1
3/8” good quality, roofing gravel OOOOOOOOOOOOOOOOOOOO
embedded in a floodcoat of
hot rubberized asphalt
1 ply of 3.0 mm, rubberized, 180 gram
polyester reinforced base sheet fully _____________________________
embedded in a solid mopping
of hot rubberized asphalt
1 ply of 3.0 mm, rubberized, 180 gram
polyester reinforced base sheet fully ______________________________
embedded in a solid mopping
of hot rubberized asphalt
1 ply of 3.0 mm, 180 gram polyester
reinforced, rubberized base sheet fully _____________________________
embedded in a solid mopping of
hot rubberized asphalt
Top course of insulation – 1/2” asphalt ______________________________
saturated fibreboard adhered in a solid ______________________________
mopping of hot rubberized II asphalt
Base course of insulation –2.5” ______________________________
polyisocyanurate insulation – _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
adhered in an approved volume of ______________________________
urethane foam adhesive – R value 15
Base course of insulation –2.5” ______________________________
polyisocyanurate insulation – _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
adhered in an approved volume of ______________________________
urethane foam adhesive – R value 15
Vapour Barrier 1 ply rubberized, self-adhesive
polyolefin faced vapour barrier adhered in ______________________________
full surface primed metal deck
BEC – 3 PLY RUBBERIZED BASE SHEET ROOF SYSTEM –
NON-RUBBERIZED ASPHALT – ROOF SYSTEM SCHEMATIC – SYSTEM 2
3/8” good quality, roofing gravel OOOOOOOOOOOOOOOOOOOO
embedded in a floodcoat of
hot type II asphalt
1 ply of 3.0 mm, rubberized,180 gram
polyester, reinforced base sheet fully _____________________________
embedded in a solid mopping
of hot Type II asphalt
1 ply of 3.0 mm, rubberized, 180 gram
Polyester reinforced base sheet fully _____________________________
embedded in a solid mopping
of hot Type II asphalt
1 ply of 3.0 mm, 180 gram polyester
reinforced, rubberized base sheet fully _____________________________
embedded in a solid mopping of
hot Type II asphalt
Top course of insulation – 1/2” asphalt ______________________________
saturated fibreboard adhered in a solid ______________________________
mopping of hot type II asphalt
Base course of insulation –2.5” ______________________________
polyisocyanurate insulation – _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
adhered in an approved volume of ______________________________
urethane foam adhesive – R value 15
Base course of insulation –2.5” ______________________________
polyisocyanurate insulation – _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
adhered in an approved volume of ______________________________
urethane foam adhesive – R value 15
Vapour Barrier 1 ply rubberized, self-adhesive
polyolefin faced vapour barrier adhered in ______________________________
a full surface primed metal deck
Comparison Chart For Two Roof Systems – BEC
| Comparator | BEC System #1 – 3 Ply Rubberized, Composite Ply Sheet Roof System – Kettle Modified | BEC System #2 – 3 Ply Rubberized, Composite Ply Sheet Roof System – Type II | |
| Substrate | Metal Deck | Metal Deck | |
| Vapour Retarder | 1 ply, rubberized, self-adhesive, polyolefin faced adhered on fully primed metal deck | 1 ply, rubberized, self-adhesive, polyolefin faced adhered on fully primed metal deck | |
| Base Insulation | 2.5 inch polyiso adhered in an approved volume of urethane foam adhesive on a fully adhered vapour barrier | 2.5 inch polyiso adhered in an approved volume of urethane foam adhesive on a fully adhered vapour barrier | |
| Base Course of Insulation | ½” asphalt saturated fibreboard adhered in a solid mopping of hot rubberized asphalt | ½” asphalt saturated fibreboard adhered in a solid mopping of hot Type II asphalt | |
| Top Course of Insulation | ½” asphalt saturated fibreboard adhered in a solid mopping of hot rubberized asphalt | ½” asphalt saturated fibreboard adhered in a solid mopping of hot Type II asphalt | |
| Base Ply Of Membrane | 1 ply of 3.0 mm, 180 gram polyester reinforced, rubberized base ply in a solid mopping of hot rubberized asphalt | 1 ply of 3.0 mm, 180 gram polyester reinforced, rubberized base ply in a solid mopping of hot Type II asphalt | |
| 2nd Ply of Roof Membrane | 1 ply of 2.5 mm, composite, polyester/fibreglass, reinforced, rubberized base ply in a solid mopping of hot rubberized asphalt | 1 ply of 2.5 mm, composite, polyester/fibreglass, reinforced, rubberized base ply in a solid mopping of hot Type II asphalt | |
| 3rd ply of Membrane | 1 ply of 2.5 mm, composite, polyester/fibreglass, reinforced, rubberized base ply in a solid mopping of hot Type II asphalt | 1 ply of 2.5 mm, composite, polyester/fibreglass, reinforced, rubberized base ply in a solid mopping of hot Type II asphalt | |
| Surface Finish | Gravel surfacing embedded into a heavy floodcoat of hot rubberized asphalt | Gravel surfacing embedded into a heavy floodcoat of Type II asphalt | |
| Membrane Adhesive | Rubberized, virgin asphalt, kettle grade – applied hot | Type II roof asphalt applied hot | |
| Renewal of Surface Required During Service Life of System? | No, gravel and floodcoat are essentially permanent | No, gravel and floodcoat are essentially permanent | |
| Top Floodcoat Material | Hot applied, rubberized, virgin asphalt with exceptional weathering resistance applied at a rate of 70 lbs. per 100 sq. ft. | Hot applied, Type II applied at a rate of 70 lbs. per 100 sq. ft. | |
Warranty | Standard – typically 10 years – more can be purchased – see Notes | Standard – typically 10 years – more can be purchased – see Notes | |
| Estimated Service Life of System | 45 years plus, plus – essentially a permanent roof | 25-30 years plus | |
| Resistance To Leakage | Excellent – the multi-layer membrane features redundant waterproofing, exceptional toughness and resistance to puncture – essentially seamless | Excellent – the multi-layer membrane features redundant waterproofing, exceptional toughness and resistance to puncture – three very robust plies | |
| Resistance to Traffic | Excellent – the polyester membrane is extremely tough and robust and the adhered gravel surfacing provides protection from traffic and damage | Excellent – the membrane is extremely tough and robust with three plies of polyester reinforcement and the adhered gravel surfacing provides protection from traffic and damage | |
| Ease of Leak Source Identification | Excellent – the multi-layer membrane is extremely tough, all layers are completely adhered together – holes in the membrane are extremely unlikely. If a hole is made by great force – water will not be able to migrate and the hole will be obvious | Excellent – the multi-layer membrane is extremely tough, all layers are completely adhered together – holes in the membrane are extremely unlikely. If a hole is made by great force – water will not be able to migrate and the hole will be obvious | |
| Low Temperature Flexibility | Excellent – entire system flexible to – minus 20oC minimum- rubberized polyester reinforcement is flexible to coordinate with the flexibility of the rubberized asphalt | Good – all plies are rubberized and reinforcement contains much flexible polyester – Type II asphalt is rigid | |
| Resistance to Thermal Shock | Excellent – entire system is elastic and movement tolerant over full range of ambient conditions | Good – robust polyester reinforcement is elastic and all plies are rubberized – Type II asphalt is rigid | |
| Elongation and Recovery | Excellent – 700% plus elongation with over 95% recovery – rubberized asphalt and polyester reinforcement is extremely flexible | Good – Polyester reinforcement is very flexible but is restrained by the rigid Type II asphalt | |
| Puncture resistance | Excellent – the roof membrane is composed of a polyester, flexible base sheet and three extremely durable, polyester ply sheets that are virtually impervious to puncture – in addition the rubberized asphalt provides “squirm” puncture resistance | Excellent – the roof membrane is composed of a polyester, flexible base sheet and two composite plies with more polyester extremely durable, ply sheets that are virtually impervious to puncture – the floodcoat of asphalt and gravel surfacing increases toughness | |
| Perimeter Base Flashing System | Excellent – base ply of high strength solid, rubberized flexible, polyester reinforced flashing sheet is covered with a solid cap ply of flexible, rugged polyester cap sheet – both layers adhered with rubberized asphalt which provides exceptional movement tolerance | Excellent – base ply of high strength , solid, rubberized flexible, polyester reinforced flashing sheet is covered with a solid cap ply of flexible, rugged polyester cap sheet – both layers adhered in and with Type II asphalt | |
| Resistance To Ponding Water | Excellent – the top floodcoat of rubberized asphalt and gravel surfacing are resistant to the effects of ponding – entire system is non-rotting – full rubberized system is resistant to ponding conditions – polyester is superior | Good – the top floodcoat of Type II asphalt and gravel surfacing are resistant to the effects of ponding – the entire polyester/fibreglass system is non-rotting | |
| Resistance to Ultraviolet and Heat aging | Excellent – the rubberized asphalt is resistant to heat aging and the SEBS rubber compound highly resistant to ultraviolet attack is highly resistant to ultraviolet attack that is integral is highly resistant to ultraviolet attack | Good –the coated rubberized ply sheetsare resistant to ultraviolet attack and the top floodcoat of Type II asphalt enhances the resistance of the ply sheets |
