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Author Topic: Floor and wall board moisture content  (Read 666 times)

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Offline pbailey

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Floor and wall board moisture content
« on: September 09, 2022, 09:37:50 PM »
I did a search on the Internet for the average moisture contact of a home with central heat and air. The answers I got were typically 30 to 40%. My question is why dry wood to be used inside down to 10%? Would it only expand a little bit over time?

Offline JoshNZ

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Re: Floor and wall board moisture content
« Reply #1 on: September 09, 2022, 09:50:39 PM »
Think you might be mixing terminology, relative humidity in your home and timber moisture content aren't the same number.

Relative humidity of 35% in a 70F home let's say, equates to an equilibrium MC of more like 7%.

Offline Southside

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Re: Floor and wall board moisture content
« Reply #2 on: September 09, 2022, 11:56:29 PM »
The industry standard is to dry hardwood flooring to 7% MC. Even at 10-12% you will end up with movement, shrinkage, and a poor floor. 
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Offline Don P

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Re: Floor and wall board moisture content
« Reply #3 on: September 10, 2022, 06:02:04 AM »
Start here and holler back if it's clear as mud;
Equilibrium moisture content - Wikipedia
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Offline trimguy

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Re: Floor and wall board moisture content
« Reply #4 on: September 10, 2022, 09:46:52 PM »
What is the industry standard for SYP ?

Offline Ianab

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Re: Floor and wall board moisture content
« Reply #5 on: September 11, 2022, 12:02:51 AM »
What is the industry standard for SYP ?
Construction pine is usually only dried down to below 19%. At that number it can't stain or rot. The wood you buy may be less if it's been stored for a while, and of course it dries out over time. Bit if it's wall stud for example, no one notices if it gets 1% narrower over time. 
But with floor boards or furniture, you notice the gaps or other random movement.
The 7% MC for "furniture" dry hardwoods is basically an average that works for most of the continental USA. Other areas, especially coastal, might have a higher EMC. It's more like 12% here.  
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Offline Southside

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Re: Floor and wall board moisture content
« Reply #6 on: September 11, 2022, 12:06:10 AM »
10% on SYP.  Below that and it gets brittle, splinters, and tears apart hard when milling.  
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Offline Don P

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Re: Floor and wall board moisture content
« Reply #7 on: September 11, 2022, 06:23:55 AM »
The "turn that truck around" point in Raleigh for cabinets, millwork and furniture which isn't too far from you was 13%. We could maintain 12 in the open shops but not much drier. With SYP when I left there more high temp kilned wood was coming in. Very slightly darker but the main thing was I could hear the difference at the whirlwind saw as I broke it down. I'm pretty sure the sound was an internal tension set from the very rapid drying.
The future is a foreign country, they will do things differently there - Simon Winchester

Offline trimguy

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Re: Floor and wall board moisture content
« Reply #8 on: September 11, 2022, 12:29:51 PM »
Sorry, I knew what I meant 😂. I was talking about pine for trim work, wall paneling, flooring, etc. Thank you.


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