Installation Guide
28   © 2019 Fortress Framing, LLC   Rev6-10/10/19
Strapping (Mid-Span Blocking) 
Ground Level Decks 
Elevated Decks 
NOTE: The larger diameter holes in the strap are to allow water to escape when it's installed on the underside 
of the joist. 
For Joist Spans greater than 8’, blocking is required midspan at every bay. 
There are two dierent installaon opons for the 12" O.C. and 16" O.C. straps; one for ground level decks and 
one for elevated decks. 
Using Evoluon 12” or 16" O.C. Straps, Place on 
the TOPSIDE of the joist. The strap is 4’ long and 
will cover (4) Joist for the 12” O.C. version and 
(3) Joist on the 16” O.C. version. 
This method should only be used when the deck 
is ground-level and not accessible from the 
boom side. 
No fasteners are required when installing Strap 
on the top-side 
Using Evoluon 12” or 16" O.C. Straps, place on 
the UNDERSIDE of the joist. The strap is 4’ long 
and will cover (4) Joist for the 12” O.C. version 
and (3) Joist on the 16” O.C. version. 
This is the preferred method for installaon and 
should be used anyme there's access to the 
boom of the deck. 










