Yellow Pine Dense Structural 86, 72, 65 ? 2

[cap4000]

Does anyone know what the numbers 86, 75 and 65 mean. These are 3 of the strongest and hardest softwoods available. Any tips will be greatly appreciated.

 

[woodman88]

Here is a link I got by putting your title though one Internet search.

Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.

 

[Splitrings]

The strength is 86%, 76% and 65% of what a clear specimen would have. I'd have to dig to find out where I found this info.

 

[Splitrings]

Those are machine stress rated (MSR) grades. I forgot to mention that.

 

[cap4000]

Splitrings

Thanks for the tips.

The 1997 NDS had it as visually graded. It has ben been removed since. I have books back to the 1960's where its basically all the same design values. I did an inspection on a 90 year old building with a truss and the wood was like concrete. I barely could get a nail into it. My guess is that it was SP Dense 86 or similar.

 

[TheBlacksmith]

Alot of the older softwoods had a lot of pine resin in them. It pretty much polymerizes over the decades and hardens. I have a 60 year old house and if you don't put some soap on the threads of a screw you're driving into a stud the head will strip or the shank will twist off before the screw goes all the way home.