Products
For New Construction or Re-Roofing
Adhesive Adhered
The adhesive adhered system is the most versatile of the Lexcan roofing systems. Able to be used on any sloped surface, it is ideal for barrel, saw-tooth, or irregular shaped roofs where direction changes and corners prevail. It also offers a considerable advantage for roofs with limited load-bearing capacity since the insulation, adhesive and membrane usually weighs less than 5kgs/m² (1 lb/sq.ft.).
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Design A Adhesive Adhered |
Adhered to the insulation or substrate with a special bonding adhesive, the E.P.D.M. membrane is normally left fully exposed. If desired, the membrane may be ordered to white to add to the aesthetic appeal of the roof, or coated in any custom colour with Lexcan Colour Coating. To protect the membrane in high traffic areas, Lexcan recommends the use of Lexpad 300 roof traffic pads.
Loose Laid & Ballasted
The Design B roof is the most economical of Lexcan’s roofing systems. E.P.D.M. sheets up to 10,000 sq. ft. are simply laid loose over insulation, yielding a roofing application that is both fast and efficient. Membrane sheets are seamed together using the Lexseam method and then ballasted with smooth washed river stone or concrete pavers.
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Design B Loose Laid & Ballasted |
The Design B system is ideal for large low slope commercial or industrial applications where the system’s time and labour saving features may be maximized. It also offers similar economy in re-roofing application.
Protected Membrane
In the Design C application, the E.P.D.M. membrane is either loosely laid on an acceptable roof deck and covered with waterproof insulation or sandwiched between protective layers of insulation. Washed river stone (or gravel and Lexcan Protection mat) is applied on top of the upper layer of insulation for ballast.
The protective membrane assembly was originally conceived to protect traditional roofing membrane systems from thermal shock due to rapidly changing temperatures. Though thermal shock is not a problem with Lexcan E.P.D.M. a layer of insulation above the membrane nevertheless offers additional membrane protection.
Lexcan has several alternatives for constructing a protected membrane assembly. This selection enables the roof designer to choose the membrane and assembly best suited to a particular building.
| SYSTEM | Design A Adhesive Adhered |
Design B Loose Laid & Ballasted |
| Primary Features | Ideal for higher slope or irregular shaped roofs |
Most economical; larger sheet size fast installation |
| Slope Limitations | No slope limitations |
Dead level to 2:12 (16%) |
| Installed Weight/Sq.Ft. | Approx. 0/5 kg (1 lb) |
5 kg (10 lbs) minimum |
| Acceptable Deck Types | Nailable* Deck Req'd |
Most types |
| Acceptable Insulations† | Must be compatible with adhesives |
Most types |
| Usual Membranes Used |
Standard - 1.5 mm Fleece-backed - 1.1 mm |
Standard - 1.5 mm Standard - 1.1 mm |
| Required Surfacing | None |
Stone ballast or concrete pavers |
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| Notes: * : Must be able to accept appropriate mechanical fasteners with acceptable pull-out resistance. † : Consult Lexcan for a complete list of acceptable insulations and substrates. ** : Slopes up to vertical permitted under modified procedures. |
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| Membrane Type | Description |
Available Thickness |
Available Colours |
| Standard | E.P.D.M. compound calendered and cured into a uniform sheet membrane |
1.1 mm |
Black |
| Reinforced | Standard E.P.D.M. membrane internally reinforced with a polyester scrim |
1.1 mm |
Black |
