Cutting wood for the roof frame yourself - Moisture - Schedule

Can't you exchange dry wood for fresh wood with the carpenter/sawmill

This line of thought has actually occurred to me as well. Can someone please explain how the delivery process of raw wood to the sawmill works? Is the felled wood stored again in the forest to dry before it is delivered to the sawmill? And at most sawmills, at least those in our area, the logs lie in the open air in front of the sawmill for partially half a year to a whole year before they are processed. Does the wood dry in this way? Doesn't the wood absorb a lot of moisture again when exposed to the weather?

Then he doesn’t understand his business ;). You can google for experiences with damp wood in the roof truss. From endless mold to cracks, shrinkage, and so on. I don’t want that in my house. Aside from that, just ask your carpenter what installation moisture the DIN standard suggests and why he wants to deviate from it. Damp wood is NOT state of the art and a serious defect.

Don’t think ;) . Damp wood is not processed (and is not allowed to be). Damp wood is dried. Either started three years ago or very modern "kiln-dried". That’s as normal as breathing.

Well, I wouldn’t immediately claim that he doesn’t know his business. The craftsmen have already built the roof truss for my father and my sister. There haven’t been any problems with mold there either. But I will take a closer look at it in the next few days.

But not every sawmill has a drying kiln. And I don’t think anyone nowadays has three years to wait until the wood is dried out. Please don’t get me wrong. I am very grateful to all of you for the quick feedback and also find your statement absolutely justified. But I don’t want to recreate the optimal case here. If I had the work, I would of course also do it that way. I just thought maybe someone among you has had such experiences and can report on them.

Drying chambers are not cheap because they consume a lot of energy. And no sawmill is currently waiting for customers. The chambers are all completely full. The wood itself is not expensive, but the entire logistics behind the production of construction timber - and you cannot bypass that just because you own forest. If I remember correctly, we waited four months for the dried wood - for only two logs. And no, sawmills and timber merchants do not exchange dried construction timber for fresh logs - why would they? You don’t get bread rolls in exchange for flour at the bakery either.

The craftsmen have already built the roof structure for my father and my sister.

Then they must also comply with the DIN (it was even once stated in the VOB that a maximum of 20% moisture is allowed – whether this is still the case today, I don’t know). And it doesn’t work the way you imagine with just a few months.

And I believe nowadays no one has three years to wait until the wood is dried.

Have you ever noticed how many sawn boards are stacked at the sawmill/wood wholesale? They are there to dry (of course). And sawing doesn’t take as long as drying a solid log.

Was damp wood from our own forest used in the roof structure by father and sister as well?

What else should the beams be made of, if not from a grown trunk. As said, the purlins are made from glued laminated timber beams.

As said, we already lack the basics to assess whether rafters as classic beams would even be the best form here. And of course they can be manufactured no less than the purlins as beams; beams tend to warp relatively the most.

Can someone here explain to me how the delivery process of raw timber to the sawmill takes place? Is the felled wood stored in the forest again to dry before being delivered to the sawmill?

You are a forest owner but are working with a sawmill for the first time? - okay, that explains your naivety.