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Thread: Timber grading
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30th March 2015, 07:42 PM #1
Timber grading
What seemed to be a simple choice, turned out to bee bit of a riddle.
I need to source some treated pine in 240x45 that will span 900mm on the side, for a walkway. The logical choice would be hardwood but the weight factor is more important than I had initially thought so I had to reluctantly change to pine.
My usual supplier of timber only carries MGP10 so I started to ring around for MGP12 in H3 with little or no success. I rung up a timber mill that allegedly produces MGP12 in H3 and they pointed me to one of their retailers.
Over the phone they told me, yes no problem we do have MGP12 in H3. Yet it was a lie. What they have is F7 and he assured me "his" F7 is better than MGP10.
Now a search proved not very helpful in this regard.
I found tables that state F7 is better and others that MGP10 is better. I would happily pay for MGP12 H3 if I could find it.
Any ideas?“We often contradict an opinion for no other reason
than that we do not like the tone in which it is expressed.”
Friedrich Nietzsche
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31st March 2015, 07:41 PM #2GOLD MEMBER
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MGP10 is about the equivalent of F7.25 if that makes any sense. It is slightly above F7, but not close to F8' which is the nearest F grade to MGP12.
Similarly MGP12 is slightly stronger then F8.
This of course is theoretical, being based on destructive testing of boards that make MGP grade against boards that make F grade... By which I mean that both boards would be at the limit of strength reducing characteristics that could actually make that grade.
IN PRACTICE... As against theory... There is a significant margin applied to F grading of around about 30% or so. Add to that safety margin that most graders will, if in doubt, downgrade a board. (As a grader you don't get hammered except on price by knocking a board down a grade but you will have all sorts of strife if your timber grades lower then you've indicated)
what this means is that it is highly likely that F7 graded timber while theoretically slightly weaker then MGP10 will meet or exceed it in practice.
in the real world the difference is that minor in any case that it's moot. If you're that concerned just specify F8.
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3rd April 2015, 07:35 AM #3
Well, in my real world, there is no such thing as F8 or MGP12 in H3,I wish there was.
In fact i had to go to 3 different suppliers to even find MGP10 in H3. I found it in Bunnings of all places. When I asked the timber guy if they had MPG10 he said neeee, we use to have F7 but now have only F5. Yet knowing Bunnings I checked the timber and it was all MGP10 H3 perfectly straight and very clear of knots.
They even cut the 6m length in half for me, something they use to refuse not long ago for OH&S reasons... allegedly.“We often contradict an opinion for no other reason
than that we do not like the tone in which it is expressed.”
Friedrich Nietzsche
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