Shit wood !!!

[Mikael_L]

Daniellinus and andersmc, besides construction-grade timber (classified in terms of strength), C14, C18, C24 etc., there is also quality grading.

The classes have slightly different names depending on which standard you choose.
For example, I to VII
or
A - D
or
G2/G4-0 to G2/G4-4

See here:
http://www.traguiden.se/TGtemplates/popup1spalt.aspx?id=935&contextPage=925
Also check here:
http://ama.byggtjanst.se/Default.aspx?articleId=82&Typ=AmaNytt

There's probably much more to say about this, but that's all I know.

 

[Elkludde]

Hello all experienced lumberyard guys!
Could someone enlighten a happy amateur on the different wood qualities that exist? Is the "scale" the same for all wood, even pressure-treated (C18, 24, 30 as Anders mentioned)?

I was thinking of ordering pressure-treated decking of the Prima type. Is Prima a quality or just a term for DIY enthusiasts to think it's good quality?

I would be very happy if I could become a bit more knowledgeable before ordering since I find it bothersome to return lots of wood or to live with warped boards and knots.

there are different qualities for decking
what the classification is called I am also curious about, norrlandsfur sells some as first-class, surely there is a difference between that and smålandsfur, best to check at the lumberyard

 

[andersmc]

Daniellinus and andersmc, in addition to construction graded wood (which is graded based on strength), C14, C18, C24, etc., there is also quality grading.

The classes have slightly different names depending on the standard chosen.
For example, I to VII
or
A - D
or
G2/G4-0 to G2/G4-4

See here:
[link]
Also check here:
[link]

There's probably a lot more to say about this, but that's all I know.

Yes, obviously the wood raw material must be sorted during the manufacturing process. You can't use all wood for just anything.

One can imagine a classification depending on what to make from the wood raw material: pellets, firewood, chipboard, pulp, packaging, rough paneling, studs, exterior paneling, interior paneling, door frames, flooring, moldings, furniture...

But this grading is probably already done when the wood products reach the consumer, right? We can’t choose between "nice" and "ugly" studs; someone else has already made that choice.

 

[Mikael_L]

I guess I can step into the hardware store and order a package of 45x95 in 4.8 meters length and quality G2/G4-1, for example. Or some other quality and/or dimension.

Yes, I have ordered lengths in the exact right length for me several times. But I have never specified quality. Often I’ve received OK quality, but about 20-30% of what's delivered or something like that has ranged from a bit questionable to really bad.

I have returned some, especially after I originally started this thread. Not a word has been heard about this, so I don't have to fight for my opinion about any poor quality. But I had hoped they would start to learn that it becomes double work if they send me crap, but it doesn't seem to have sunk in yet.

 

[Noseone]

They probably just sell it to the next customer.

 

[Mikael_L]

Here you can also find some miscellaneous timber knowledge.
http://www.beijerbygg.se/upload/byggr%E5d/br%E4dg%E5rd/beijer_5_bra%20att%20veta%20om%20tr%E4.pdf

Or this even more detailed 4MB large PDF.
http://www.npn.se/wp-content/uploads/2012/05/att_valja_tra.pdf

 

[Mikael_L]

And an essay about timber sorting.
http://gupea.ub.gu.se/bitstream/2077/22732/1/gupea_2077_22732_1.pdf

Not very good, but there is some information to be found in it.

 

[Thomas Lundquist]

Useful info Micke. Surely many have learned something.

I see that I belong to "oldschool" with the green book even though it was in the 80s when I worked at the lumberyard.

 

[Mikael_L]

Well, the 80s were...
...30 years ago...
Damn, I suddenly felt so old :eek:

But older sorting knowledge seems to be completely fine to have, it just seems like there are new names for it.
Like how a planed 2"4 is now called 45x95...

 

[Mikael_L]

I'll necrobump a bit then ...

But ever since I started this thread, I've been trying to get hold of SS-EN 1611-1 (standard for trade sorting) in some free way. For example, borrowing from a library.

But now I found the following two PDFs at Svenskt Trä
http://www.svenskttra.se/siteassets/6-om-oss/publikationer/pdfer/guide_klasser_150.pdf
http://www.svenskttra.se/siteassets/6-om-oss/publikationer/pdfer/handelssortering_150.pdf

Which I believe give us the correct answer when a plank meets the standard or when it should unquestionably be subject to claim.

So order according to a trade class, or ask which class you will receive.

Feel free to download the PDFs locally on your own computer; they could disappear...

 

[0lle]

I can't help but write a few lines.

I think it's very silly to search for straight lumber or examine growth rings. Very rarely do you need straight lumber. If you're not completely useless, you can easily shape it during installation. If you occasionally need something straight, you buy glulam or steel studs.

I see it as obvious to choose products based on what they will be used for. Deviant vegetables and root crops as they're going to be cut up or mashed anyway, dented boxes and cans since they will be thrown away anyway, lumber and sheet material because they'll be screwed, concealed or painted.

The worst must be if what you choose to discard ends up being thrown away. No eco-diesel or organic pepper can compensate for that.

 

[Janus82]

You are welcome to buy the reglar that we leave behind at the lumber yard. For it is indeed much easier to get a straight interior wall when you have straight reglar instead of propellervirke.

I have at least saved the PDFs and read them with pleasure, nerdy as I am.

 

[Mikael_L]

I am primarily interested in what reasonable demands one can place on their timber.

It's easy to feel like a "grumpy customer" when you've received a lot of poor-quality timber in a load.

When I build my next house, I will inquire about/specify the quality grade when ordering timber, and they will simply have to deliver new products if what I receive significantly deviates from what I ordered.

 

[haavard]

In some cases, you have to accept subpar lumber. I have a ceiling made of raw planks. Then, it was just over half of the package that I could use, but since raw planks are intended for other purposes, I just had to smile. The other package I picked up board by board...

 

[Mikael_L]

In some cases, you have to accept poor quality wood. I have a ceiling made of råspont. Then it was only slightly more than half of the package I could use, but since råspont is intended for other things, I just had to grin and bear it. The other package I picked up board by board...

Yes, you have to realize that råspont is not of such sorted quality that it can be visible at all. You simply bought the wrong wood.