Hi Chris,
I talked with a guy that has done construction for years and he recommends
reinforcing the 2x4's by bolting 2x6's to the 2x4's (running the complete
length of the rafter) a piece of plywood would be between the 2 by 4 and the
2 by 6. Liquid nails would be used between the plywood and the 2x4 and 2x6.
Then a stacked pair of 2 by 8s mounted underneath the 2x6s. Long lag bolts
would extend from the base of the tower legs through to the 2x8s. The
theory is, the weight/stresses would transfer throught the 2x8 to the 2x6
beams down to the walls. I would be surprised if this would not be enough.
I would rather over engineer this.
The city accepts drawings by the homeowner. It does not have to be
professionally done (although I will do my best anyway :)
Thanks again guys...
Jason Hissong
----- Original Message -----
From: "Chris BONDE" <ve7hcb@rac.ca>
To: <zigm1975@alloymail.com>
Cc: "TOWER TALK" <towertalk@contesting.com>
Sent: Sunday, December 08, 2002 12:21 AM
Subject: Re: [Towertalk] Roof Tower stuff.... 2 by 4s, city, :(
> Long time ago my father built a garage with 2x4s rafters 24in on
> centre. Later the code changed, about 25 yrs. He then put in extra
> rafters between to make them 12in on centre. I assume that yours are 16
in
> on centre. Have you thought about putting in extra to have them 8in on
> centre?
>
> Chris opr VE7HCB
>
>
> At 11:38 PM 2002-12-07 +0000, S. Markowski Jr. wrote:
> > > "Trusses using 2x4's are quite strong when properly designed and
used."
> >
> >2" x 4"s used in a truss system are considered a "light-weight" truss
> >system. They are usually designed to carry the minimum ice/snow load
> >calculated for the area where installed.(cheap to build and install, but
> >savings rarely carry down to the home buyer) They are not forgiving when
> >uncalculated/designed loads are placed on them. And if one truss fails,
> >they ALL fail in a collapse. The advice of an engineer or truss
> >fabricator to come up with a possible fix/reinforcement(if one is
> >possible) is the best I've heard yet. I doubt it will be easy, nor
> >inexpensive to carry out.
> >
> >I'm not a building construction expert, just looking at this with 25
> >years of firefighting experience. Truss roofs collapses are amongst the
> >top causes of firefighter fatalities, along with the other components of
> >"light-weight" construction.
> >
> >Good Luck and 73,
> >Zig KM9M
> >
> >
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