Advanced Structural
Designs ACN 097 789 87
92 Vasey Cres CAMPBELL ACT 2612 Telephone
61612171
Facsimile 61612170 Email mal@structuraldesigns.com.au
What’s the difference between a Hyne I Beam and a Hybeam?
This is a good question because the two seem to be used interchangeably
on Projects but they are not the same.
Both of the above are timber I shaped beams commonly used for joists and
rafters in
The Hybeam has a ply web and an LVL top and bottom flange while the Hyne
I Beam has a oriented strand board (OSB)
web and MGP15 fingerjointed flanges. The
LVL flanges can carry 33MPa or more in tension but the M15 pine is only worth
22.7MPa which starts alarm bell ringing straight
away.
Let’s look more closely at a Hybeam HJ300 Vs a Hyne I Beam HI30068. The Hybeam flanges are 63 by 39 whereas the
Hyne I Beam is 68 by 34 so the Hyne I Beam has 5% less timber in the flanges.
Perhaps the two most significant performance indicators are EIx and Mx
which measure the stiffness and strength in bending respectively.
On comparison of published data the Hybeam is 70% stronger than the Hyne
I Beam but falls 15% short on stiffness.
For lightly loaded joists and almost all rafters, stiffness rather than
strength may be the governing criteria which means that for the many
applications the Hyne-I-Beam will span further.
One of the features of Hyne I Beams is that they are also available in a
wider 88 mm flange which although it still falls 25% short on strength (on the
above comparison) is some 50% stiffer than the Hybeam.
The bottom line here is if you need to make a change from one to the
other economic or supply reasons you do need to talk with your engineer to get
the OK.
If you need a comparison done by a structural engineer in Canberra ACT
or the surrounding region or just need advice on timber framing call Mal Wilson
from Advanced Structural Designs on Ph 02 61612171.