Duro-Last Concrete Screws - Manual

Duro-Last: The Proven Performer®
"Duro-Last" and "The World's Best Roof" are registered marks owned by Duro-Last , Inc.
www.duro-last.com 800-248-0280
DATA SHEET
2009
20
DURO-LAST ® CONCRETE SCREW
CONCRETE SCREW DIMENSIONS
Length
Quantity per
Bucket
1.25 in. (31 mm) 1000
1.75 in. (44 mm) 1000
2.25 in. (57 mm) 1000
2.75 in. (69 mm) 1000
3.25 in. (82 mm) 1000
3.75 in. (95 mm) 1000
4.25 in. (107 mm) 1000
5 in. (127 mm) 1000
5.5 in. (139 mm) 1000
6 in. (152 mm) 1000
6.5 in. (165 mm) 500
7 in. (178 mm) 500
7.5 in. (190 mm) 500
8 in. (203 mm) 500
9 in. (229 mm) 500
10 in. (254 mm) 500
11 in. (279 mm) 500
12 in. (305 mm) 500
Description:
Duro-Last®, Inc. specifies the use of concrete screws
for the mechanical 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 pilot 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 right. Additional sizes are
available on a drop ship basis. Please allow
adequate time for ordering and delivery of special
orders.