Page 524 - Construction Waterproofing Handbook

15.8 CHAPTER FIFTEEN

Ed Note: Retain below with appropriate drainage composites above. Select fabric based upon site-specific soil conditions and Mirafi
recommendations. Refer to Miradrian Site Specific Geotextile Fabric Selection Guide shown below. Consult with Mirafi for recommendations
and site-specific requirements in accordance with project-specific soils report. Below listed performance requirements and terminology are
standard for geolextile testing methodology.

MIRADRAIN, SITE-SPECIFIC GEOTEXTILE SELECTION GUIDE*

Coarse Sand Sllty Clayey Sandy Silt Clayey Sandy Silty Clay
Sand Sand Sand Silt Silt Clay Clay
Woven
Fabrics
HP 500
FW 40/10
FW 70/20
SPECIFIC'
TESTING
REQUIRED
Nonwoven
Fabric-
ISDN

*Due to instability of silty soils, Mirafi requires that an individual soil test and filtration design be performed by Mirafi engineering services.
Contact a Mirafi representative for further details.
"Please note that this selection guide is merely a reference chart and is not meant to replace sound geotextile engineering design practices.
"*Nonwoven fabrics are to be used in vertical applications only.
b. Miradrain Standard Fabrics:

140NC 700XG
(MD 2000, 5000, 6000, 6200, 8000) (MD 8000, 9000)
Flow Rate 120gal./min7ft 2 100gal./min./ft 2
2
(ASTMD4491) (4903 l/min/m ) (4086 l/min/m ) 2
Apparent Opening Size 70 (0.21) U.S. Sieve (mm) 40 (0.42) U.S. Sieve (mm)
(ASTMD4751)
Grab Tensile Strength 1 10 Ib., Machine Direction 365 Ib., Machine Direction
(ASTM D 4632) (0.49 kN) (1 .62 kN)
Mass Per Unit 4.0 oz/yd 2 5.6 oz/yd 2
2
2
(ASTM D5261) (136g/m ) (190g/m )
Puncture 70 Ib. 115lb.
(ASTM D 4833) {0.31 kN) (0.51 kN)
FIGURE 15.1 (Continued) Guide specification for section 2715, prefabricated drainage system. (Courtesy TC MiraDRI)