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Joists are supported by the walls underneath them. The tops of your walls all need to be on the same plane, level. That will make your ceiling lines straight after drywall. The top of the joists in an attic will never be seen, and as such do not matter. Most framers will look at each joist and put any crown facing up, knowing that over time they will sag a little and be straight from the inside of the room.
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Why should the tops of floor joists need to be level?
Joists are supported by the walls underneath them. The tops of your walls all need to be on the same plane, level. That will make your ceiling lines straight after drywall.
can plumbing go through joists?
Yes. It isn't desirable but can be done. However you need to understand enough about construction to know how to do it properly without causing damage to the joists and areas around them.
Can roof joists run in a different direction to floor joists?
Yes. Rafters and flloor joists do not have to run the same direction.
How do you build a deck close to the ground?
AnswerI have done it two different ways. One way is to build your frame with all the joists and rim joists then manipulate the dirt by moving it around or digging it out to make it level. Another way is to put it on posts and raise it an inch or two off the ground and level it by attching the joists to the posts using a large level. There is no one way that is correct method everyone is different. I like the post method cause it doesnt sit right on the ground and will resist rot alot better.
Factors that affect the size of ceiling joists?
The size of ceiling joists is primarily influenced by the span they need to cover and the load they must support. Other factors include the type of wood used for the joists, the spacing between joists, and any additional load considerations like heavy fixtures or storage. Local building codes and regulations also play a role in determining the size of ceiling joists.
How do you find load bearing walls in a 2 story?
You will need to go to the level above the wall. If girders, joists or another wall is supported by your initial wall, then that becomes a 'load'. Supported by by the wall downstarirs, Thus bearing a load
What size of beam do you need to span 18 ft?
For ceiling joists, the minimum dimension per the IBC is a 2 x 12 inch, with spacing dependent on the load. Ideally, these would be screwed to blocking between the joists.
What is the strongest method for installing floor joists?
Joists resting upon sills and girders
How much weight can joists hold?
That depends upon the size of the joists & grade/species of wood
What size of floor joist should you use?
Different situations call for different joists. Generally floor joists are 2 x 12.
Which teeth do you need to brush the tops of?
All of them
Difference in tji joists and bci joists?
Different manufacturers. Trusjoist McMillan (sp?) and Boise Cascade
