How much should I brace/cross brace?

Mikael_L · 2010-09-30T21:39:45+00:00

Hello. I have a floor structure for the upper floor with various spans, consisting of 45x220 K24 cc600. The longest free span is 3.8 meters, which is between the outer wall and the load-bearing wall, so the entire floor joist length is (slightly) double that. The next longest free span is 2.4 meters. But the beams are actually 4.3 meters between the outer wall and the load-bearing wall, though they hang on the support legs and a relieving beam at 1.9 meters from the outer wall, see the image. So, from the outer wall, 1.9 meters into the house, the subframe "hangs" in the rafters on the support legs, and the beams in between are attached with fork anchors to a 45x220 that is supported from the relatively stable point at the support legs. Then there is a remaining 2.4-meter span to the load-bearing wall. Then I actually have a 2.5-2.6 meter free span in another spot as well, between two load-bearing walls. How much do you think I should sheet? Only in the 3.8-meter section, or in all?

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Myhran

#16

Member · Dalarnas

· 116 posts

9 May 2017 at 8:59 PM

Myhran

Member

Dalarnas
116 posts

9 May 2017 at 8:59 PM

jumping into this thread....
going to build the same on my loft
but have a 3500mm clear span to the load-bearing wall
bracing or not...
will use chipboard flooring
considering screwing triangular batten to the joists and laying ceiling boards loosely between the joists
these joists will then be visible
but noggins would ruin that idea

How much should I brace/cross brace?

Myhran

Myhran

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