After the wood is  kiln dried it is milled to the size of lumber that you buy at the lumber yard. The wood can still absorb moisture from the air, so  once unbundled, it can warp and shrink as it would have if it were never dried, only not near as much. The chalk line, when stretched tightly, represents a perfectly straight line between the two top ends of the joist. In decking "old school" BPT [before pressure treated} remember the various shades of red paint/stain 2x6 {spf} decks, back when everything was hand nailed with a few Nova Scotia smiles here and there . The good news is that each separate floor truss has the exact amount of crown built into it so humps are a thing of the past. Most of us wish they were straight so that walls and floors would be in the same plane. The wood came in wrapped skids that was very wet from the plant. Hence, I put the good side up.
This is how nature breaks down wood. When it is cut down the wood is full of water, when it is cut into framing lumber it has to be cut in larger sizes than what you buy. Then the sun comes out and dries it out.

Mark & Theresa are traveling to Chicago for LIVE MyFixitUpLife shows at 11:30amCT and 2pmCT…Go to almost any lumber yard and the wood you’ll find there is milled on all four sides. The floor trusses are made in a similar fashion to roof trusses. I can confidently say that I expect to be a life-long subscriber." And by best face I mean the nicest face—any wane or bark goes down. That is that over time gravity can cause the lumber to warp or sag in a downward direction. {provided you can't climb up or crawl under to reseal} it's going to want to swell and the top side is sealed and somewhat stable, depending on the quality of the sealer or paint, something got to move, hence you have curling and or cupping. Wood I-joists are made with no built-in crown. All outside walls are load bearing, and generally, the wall down the center of your house following the peak of your roof would be load bearing. Just imagine if the floor, ceiling and roof joists were installed with the crown down,the floor, ceiling and roof would probably, if not immediately, very soon look like a bowl. And by best face I mean the nicest face—any wane or bark goes down. Anytime wood is exposed to sunlight or moisture for an extendedI'm looking at this in mid-2018, but have just put down a new deck surface on an existing structure. (even less desirable) So get out the sealer!If your deck boards are plainsawn, they will "cup" alot. Wood is wood.

If that mental image doesn't connect, you might think one of the crew has some expensive dental work in their immediate future. (unless it was reclaimed old growth yellow pine)I just got done building a deck for a customer that insisted on buying his own decking and on using Pressure treated yellow pine.

If you want perfectly straight walls, your builder can order engineered lumber wall studs or use steel studs in critical locations.

Answer Save. The carpenter I worked with always gave me a reason for doing things his way/the right way (same thing in his mind). you want to nail this stuff up ASAP.

When the wall is tilted into position, the wall may have a very slight hump in it as the crowns face out instead of inward.Some lumber may have excessive crowns. If the board is installed wrong side up (or bark side up) it will curve up on the … Straight walls are a must in bathrooms where tile will be installed and any wall that will accept cabinets and countertops.

Given the points that Williams and Knaebe make and the industry position, I now Sign up for eletters today and get the latest how-to from Fine Homebuilding, plus special offers.Get home building tips, offers, and expert advice in your inbox I agree with Mike . Provided of course that homeowners understand how it behaves (graying out, staining, soft nature). When the flat grain face of treated wood checks a crack developes that allows water,ICE,pollen,dust and dirt to accumulate in an area that is not treated.

In the case of floors, you absolutely want the crowns of the joists to point to the sky after the joists are nailed in place. These are often made at the factory with a crown built into the floor truss, but once the floor is covered and furniture put into the room, the trusses are meant to flatten out to a large degree. In my opinion, a 16 foot long floor joist should have no more than a one-half inch crown. Engineered floor trusses and engineered I joists can be used. These load bearing walls support these joists. I've always been a barkside up guy.

We would like to think of our studs as being straight. Grain direction (bark side up/pith side up) doesn’t really matter.
Please enable JavaScript on your browser to best view this site.Most residential framing is done with wood. Depending on where you live in the country you will be using southern yellow pine, pine, or douglas fir etc.

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