Why is there such a big difference at the same lumberyard?

[J Vos]

However, I am quite sure that the OP is not any wiser since he started asking his questions 😅

So who is it now that is calling the OP an idiot? Is it the person who asks why the OP chose those particular boards or you who claims the OP cannot absorb the information from the thread.😉.
I hope you don't take this as a personal attack, I'm just trying to make you realize that you can choose how to interpret others.

 

[Qwerty987654]

Who is it that's calling TS an idiot now? Is it the person asking why TS chose those particular boards, or you claiming that TS can't understand the information in the thread?😉.
I hope you don't take this as a personal attack, I'm just trying to get you to realize that you can choose how to interpret others.

No personal attack! Good point. I was obviously unclear! I meant that TS asked for facts but was met with assumptions. Not that TS doesn't understand the assumptions. Only that I perceived it as TS wanting facts but not getting them. I could absolutely have misunderstood!

 

[J Vos]

No attack! Good point. I was obviously unclear! I mean that the OP requested facts but was met with "killgissningar." Not that the OP doesn't understand "killgissnings." Just that I perceived it as the OP wanted facts but didn't get them. I might absolutely have misunderstood!

There isn't a better answer than "killgissningar" to get without a clearer question, I would think. The OP writes that they want to know why different boards in the same sorting have such a large difference in growth rings. They received both info about faster growth and about how the wood industry works. Both are true, but until we have learned to read the minds of unknown people and institutions to us, no outsider can provide a satisfactory answer?

 

[Niq]

Interesting to read about how important it is to treat the surface of wood, both on end grain and the rest of the board. Then you take a trip to the countryside and see a lot of old barns without any surface treatment, probably without drip noses too. Many are surely close to a hundred years old or older.

 

[Hammarskallen]

A thesis report for a bachelor's degree amounts to a total of 10 weeks of work... It's doubtful to classify as research (and it's not reviewed at the level that a real research article usually is) and like the authors themselves do in the sentence you quote, I would also have been cautious to draw too large conclusions based on this... (they disclaim with "based on the irrigation model used", meaning this is not a generalizable result).

It's still better than everyone sitting here and making guesses.......

 

[Mats-S]

Read and ponder:

[link]

There is a major weakness in the highly theoretical study, see page 3:

1.4 Limitations
The experiment is limited by time and resources to be a short-term study over one day and to only include the bottom boards of spruce facade panels with end-grain angles of 0; 7.5; and 15 degrees. The selected surface treatments are linolja and Falu rödfärg.

A one-day study!!!
We're talking about decades of end-grain exposure to weather and moisture, not what happens in one day. The study you refer to is basically worthless, only a theoretical concoction of poorly substantiated observations over one day! It would have been more beneficial if empirical studies were conducted on existing buildings.

Even this is ridiculous, there is not the slightest relevance to real conditions:
"After finished watering the entire surface of the facade panel was wiped with a cloth."
😂 😆🙃

It's still better than everyone sitting here and guessing......

Guessing?
So you value this subpar 24-hour experiment more than the experiences from carpenters and timbermen who have worked with this their entire lifetime...

There is a research report linked earlier in the thread:

See above, this is not worthy of the name "research report," more is required to be called research 🤔

 

[Hammarskallen]

Guessing?
So you value this subpar 24-hour experiment higher than the experiences of carpenters and joiners who have worked with this their whole lives...

Where did joiners come into it? Is that a profession? There are plenty of carpenters who dismiss the drip edge because it's not worth the trouble. End of story.

 

[J Vos]

Where did the carpenters come into all this? Is it a profession? There are several joiners who dismiss the drip edge because it's not worth the trouble. End of story.

A timberman builds log houses. If these joiners had to give a 30-year guarantee on boards and had no competition from less meticulous ones, they would reassess the function of the drip edge I guess.

 

[fribygg]

A carpenter builds log houses. If these carpenters were required to give a 30-year warranty on boards and were free from competition from less meticulous ones, they might reevaluate the function of the drip edge, I guess.

But 1-inch panels of pine or spruce mounted vertically as siding seem to last at least 100 years, regardless of whether they are painted red or untreated, and regardless of whether a drip edge, taper, angled cut, or none was used during installation. If someone later applies plastic paint to the old unpainted or red-painted facade, the remaining lifespan of the facade often appears to be quite limited. I guess it becomes too sealed since it rots behind the plastic paint, especially if someone has been meticulous and painted the board's end with dense paint.

If one chooses fast-growing poor-quality wood, coats it with plastic paint on more than one side, and installs it without an air gap, rot seems to appear in less than half or, in some cases, in under a quarter of a lifespan. The example board with a pith in it is a prime example of lumber that, if coated with plastic paint and used as an edge board, bargeboard, or similar exposed building part, will age quickly and without grace.

 

[Mats-S]

I have a simple northern Swedish holiday home from the 1800s with untreated vertical wooden facade that is so old the nails are not galvanized, do you mean I will avoid future problems if I paint the facade?

No, since you have a facade with northern Swedish heartwood, it cannot be compared to the junk you buy at the lumberyard today.

 

[Mats-S]

This is completely wrong. The panel should be cut at a right angle otherwise the area of the exposed end grain increases.

You are missing that the capillary forces work best at a right angle, so you have completely missed the theory behind the function with a drip edge.

 

[Mats-S]

Not according to the wood research institute

What research, source please.

 

[Mats-S]

Where did carpenters come into all this? Is it a profession? There are plenty of carpenters who diss the drip edge because it's not worth the trouble. End of story.

Yes, it is a job title, and those who work as carpenters know a lot more than you on the subject, but as usual, professional knowledge is dissed in favor of questionable academic theories.

 

[MetteKson]

OT, but the discussion reminds me of the Danning-Kruger effect.

​

 

[Dowser4711]

OT, but the discussion makes me think of the Danning-Kruger effect.

​

How strong do you consider your knowledge about it?
(Bonus points for misspelling Dunning-Kruger)