Panneaux de recouvrement

Les panneaux de couverture peuvent être des éléments importants des toitures commerciales. Ils peuvent accroître la résistance et la durabilité de la toiture en l'aidant à mieux résister aux intempéries, au soulèvement par le vent et à l'usure à long terme. Dans certaines circonstances, les panneaux de couverture peuvent être absolument essentiels à la longévité d'un système de toiture. Learn more at the Roof Views Blog.

When choosing between HD polyiso cover boards and gypsum coverboards, keep three basic comparisons in mind:

Lighter on the roof means easier on your crew
HD Polyiso cover boards are less than half the weight per board of gypsum cover boards, allowing more efficient packing (double packs are practical), faster craning, and higher capacity truck loads.

At less than half the weight per board of ¼” gypsum cover board — and as little as 1/10th  the weight of ⅝” gypsum — HD Polyiso cover boards can reduce deadloading on the roof, thereby contributing to a potential reduction in structural costs.

And that's not all. At 11 to 13 lb. per 4' x 8' board HD Polyiso is easy for one person to maneuver. Gypsum cover boards weigh as much as 100 lb. apiece, requiring, for safety, two people per board.

Finally, HD Polyiso cover board pallets do not require breakdown for weight distribution the way gypsum pallets do, saving time and labor.

Add insulation with your impact resistance
Choosing an HD Polyiso cover board instead of a gypsum cover board adds an R-value of 2,5 to the roof - 5x the insulation value of the gypsum board. Depending on the specification, that additional R-value can mean the difference between adding a full layer of polyiso insulation, or allow a thinner polyiso layer, saving costs. In projects where compressive strength of 80 to 140 psi is sufficient for your impact and structural demands, the addition of a 2,5 R-value can save significant insulation costs.

The 2,5 R-value of an HD Polyiso cover board is much more than an add-on. When calculated into the overall goals of your roof installation, a 2,5 R-value cover board layer gives you flexibility to select thinner polyiso boards for lower layers while still achieving your target insulation value.

Take, for instance, an R-value 30 specification: 

• Choosing a gypsum cover board would require two (2) 2,6" Iso board layers, each with an R-value of 15. The gypsum contributes virtually nothing (R-value 0,5).
• Choosing an HD Polyiso cover board (R-value 2,5) enables you to use one  (1) layer of 2,6" (R-value 15) boards, and a second layer of 2,2" (R-value 12,6) Iso boards. Depending on the size of the roof, the savings achieved by swapping the second 2,6" Iso layer for a 2,2" layer can be quite significant. Even a 500 sq. roof could reap thousands in savings.

PSI vs Productivity — Weigh the opportunity
While certain roofs are suited to a cover board with a psi in the hundreds - to achieve a required VSH rating, or to support specific heavy overburden such as amenity spaces or extensive HVAC or solar equipment - many roofs only require an SH rating, and will not be loaded with heavy equipment. For those roofs, it's important to weigh the benefits of a lighter HD Polyiso board. 

	Gypse	HD Polyiso
Easy to maneuver	Non	Oui
Messy to cut	Oui	Non
FM Severe Hail	Oui	Oui
FM Very Severe Hail	Oui	Non
R-value at ½”	0,5 (average)	2,5
Weight per Sq (½”)	200 - 275 lb.	38 lb.
Sqs. per truckload (½”)	< 250	> 700
Trucks per 1k sq.	6	2

Note: Values stated are approximate and subject to normal manufacturing variation. These values are not guaranteed and are provided solely as a guide.

Some EnergyGuard™ HD ISO products may achieve ANSI/UL 790 Class A Roofing Fire Resistance Rating over combustible decks. See individual data sheets for details.