What is the best spacing for TJIs or studs for Larsen Trusses with cellulose insulation?


When using larsen trussees, what is the maximum spacing between TJIs

steve outlet March 6, 2020Last updated: Sept. 9, 2020

I am mounting larsen trusses outboard of my structural 2 x 4 framing. i read an article that was spacing TJIs at 4' oc and ws wondering how big a cavity can be efectively dense packed? 


Responses (3)

Mike Reynolds Jan. 4, 2021, 3:35 p.m.

Hi Steve,

The size of cavity isn't really a concern, in the house Robert mentioned above the entire wall was open. There are offset 2x4s on the interior and exterior of the wall, so the entire length of wall is effectively one giant cavity 15 inches wide. But doing dense packed cellulose walls isn't really a DIY sort of insulation technique, so its more about finding a reputable installer that will do the job properly.