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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