Dow Green Roof Manuel d'utilisateur télécharger pdf

®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow

*Not to scale. For reference purposes only.

A protected membrane roof (PMR)

design is an ideal solution for “green”

roofs where landscaping or plant-

ings are used on the top surface.

Preventing leaks is crucial in any

roof, and even more so in a vege-

tative roof, because repairing this

type of roof can be costly.

In a vegetative roof PMR, typically

a fully adhered membrane is installed

over a concrete deck and the desired

thickness of STYROFOAM

™

Brand

Extruded Polystyrene Foam Insulation

and a root barrier are installed above

the membrane (Figure 1).

This layer of insulation serves a

dual function of providing both

long-term thermal insulation value as

well as mechanical protection of

the crucial waterproofing membrane

during the installation of the roof

landscaping, including drainage lay-

ers, drainage materials and plantings,

and the assorted equipment used

during the installation process.

WHERE SHOULD THE

DRAINAGE L AYER BE

LOC ATED?

The drainage layer should always

be above the STYROFOAM

™

Brand

Extruded Polystyrene Foam

Insulation to ensure that any water

is quickly drained away and the full

value of the insulation is maintained.

In vegetative roof PMR deck

designs, a drainage layer above the

insulation allows water to drain off

the top surface of the insulation,

creating a “diffusion open” assembly.

If the insulation is sandwiched

between a vapor retarder (e.g.,

saturated drainage felt) and the

underlying membrane, vapor cannot

escape, so there is the potential for

it to be driven back into the insulation

(Figures 2 and 3). To create a “diffusion

open” layer, ensure that the top surface

of the insulation has a ventilating air

space as well as provides a good

slope for drainage.

Note: Never install a polyester

mat or moisture retention blanket

directly on the insulation. If used,

ensure a clear drainage layer

separates the moisture retention

blanket and the insulation.

V e g e t a t i v e R o o f P M R – A D e s i g n P r i m e r

I N F O R M A T I O N . C O M M E R C I A L . U S / C A N A D A

Figure 1: Vegetative Roof PMR*

Landscaping Curb

Ballast

lanting Layer

ilter Fabric

rainage Layer

(

shown: preformed

rainage sheet)

Root Barrier Membrane

ully Adhered

aterproofing Membrane

Structural Concrete Deck

STYROFOAM™ Brand

Foam Insulation

Cold Exterior

40°F (4°C), 20% RH

Vapor

Drive

Vapor Impermeable Surface

(standing water, retention mat)

Fully Adhered

Waterproofing Membrane

STYROFOAM™ Brand

Foam Insulation

Structural Concrete Deck

Figure 3: Creating “Diffusion Closed” Situations

(warm, high-humidity areas in North America)*

Figure 2: Creating “Diffusion Closed” Situations

(colder areas in North America)*

Warm, Humid Interior

70°F (21°C), 40% RH

Vapor Impermeable Surface

(standing water, retention mat)

Fully Adhered

Waterproofing Membrane

STYROFOAM™ Brand

Foam Insulation

Structural Concrete Deck

Warm, Humid Exterior

90°F (32°C), 50% RH

Vapor

Drive

Cool Interior

70°F (21°C), 40% RH

1 2 3 4

Résumé du contenu

Page 1 - LOC ATED?

®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow*Not to scale. For reference purposes only.A protected membrane roof (P

Page 2 - DRAINAGE L AYER?

I N F O R M A T I O N . C O M M E R C I A L . U S / C A N A D AInstalling the drainage layer underthe insulation can potentially minimizethe overall b

Page 3 - ) OF BALLAST, IN (MM)

I N F O R M A T I O N . C O M M E R C I A L . U S / C A N A D AFigure 7: Option 3 – Drainage Layer Consisting of a CommerciallyAvailable Mat and Filte

Page 4 - BE USED IN MAINTAINING

®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow Form No. 179-05268X-0713MCKThe information in this document is not int

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Dow Green Roof Manuel d'utilisateur

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