Duro-Last Concrete Screws User Manual

DURO-LAST® CONCRETE SCR EW

Description:

Duro-Last®, Inc. specifies the use of concrete screws

for the mecha nical fastening of the Duro-Last roofing system on structural concrete decks. Duro-Last Concrete Screws are equipped with #3 square drive truss heads and are Duro-Coated for protection against the harsh roofing environment.

Duro-Last Concrete screws surpass the FM 4470

specification and may be used to fasten both

insulation and the Duro-Last membrane to the deck.

Installation:

1. Duro-Last Concrete screws are designed to be installed into a pilot hole made by a 3/16-inch (5 mm) masonry drill bit.

2. The depth of the p ilot hole should be a minimum of

1.5 inch (38 mm).

3. Penetration into the concrete deck is 1 inch (25.4 mm), minimum, from the top surface of the deck.

4. A Duro-Last Plate is required for each fastener used for membrane attachment.

Note:

• Duro-Last, Inc. stocks concrete screws in the sizes

noted in the table to the r ight. Addit ional sizes are available on a drop ship basis. Please allow adequate time for ordering and delivery of special orders.

DATA SHEET

CONCRETE SCREW DIMENSIONS

Length

1.25 in. (31 mm)

1.75 in. (44 mm)

2.25 in. (57 mm)

2.75 in. (69 mm)

3.25 in. (82 mm)

3.75 in. (95 mm)

4.25 in. (107 mm) 5 in. (127 mm )

5.5 in. (139 m m) 6 in. (152 mm )

6.5 in. (165 m m) 7 in. (178 mm )

7.5 in. (190 m m)

8 in. (203 mm)

9 in. (229 mm )

10 in. (254 mm) 11 in. (279 mm) 12 in. (305 mm)

Quantity per

Bucket

1000 1000 1000

1000 1000 1000 1000

500 500

500 500 500 500 500 500

Duro-Last: The Proven Performer®

www.duro-last.com

"Duro-Last " an d " The World's Best Roof" are registered marks owned by Duro-Las t , Inc.

800-248-0280

2009