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.
To fix sagging floor joists in your home, you can use support beams or jacks to lift and level the joists. Additionally, you may need to reinforce the joists with additional lumber or steel supports. It is important to consult with a professional contractor or structural engineer to ensure the proper solution for your specific situation.
answerYou would lay timber floor joists acroos the the size would depend upon how high you need to raise the floor. Then you'd lay floor boards over the joists. the joists would be layed every 400mm and would require noggings to reduce movevement and 'creaking'. The floor boards should be of a tongue and groove type for the same reasons. The cheapest floor bords are made of chipboard and are 8' by 2' and they should be glued.If you wanted to raise it a matter of a few inches then you could just screed over the top of it. If you wanted just a few mm then a self leveling liquid can be applied.
When something is described as perpendicular to the attic floor joists, it means that it forms a right angle (90 degrees) with the joists. This orientation is important for structural integrity and proper load distribution in construction. For example, if you were installing beams or other structural elements, they would need to be placed at this angle to ensure stability and support.
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.
Aerobic equipment should generally be on the bottom floor or in the basement level of homes but you would not need a special floor for aerobic equipment unless you choose to do so.
Your floor may be sagging due to issues with the foundation, support beams, or joists underneath. To fix it, you may need to reinforce the support structure, replace damaged beams or joists, or adjust the foundation. It's important to consult with a professional contractor or structural engineer to determine the exact cause and best solution for fixing the sagging floor.
The thickness of subfloor needed generally depends on how far apart your floor joists are located. In most cases, floor joists are 16" center-to-center and the most common thickness of subfloor is 3/4". Some homes will have 1/2". If your floor joists are farther apart, you will need correspondingly thicker subfloor to adequately support weight between the wider joists. Your city's building codes department will be able to specify what you need (some cities may have differing requirements).Another factor might be the kind of flooring you will install. For carpet, vinyl, laminate, wood and other non-rigid flooring types, the 1/2" or 3/4" will be adequate. For tile, the Tile Institute of America recommends no less than 3/4" subfloor on 16" centers floor joists - but with 1/4" backerboard installed on top of subfloor. See their website or contact your city codes department for specifics on a different span of joists.
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To effectively address subfloor squeaks in your home, you can try using screws to secure the subfloor to the floor joists, adding shims or blocking between the joists to reduce movement, or applying lubricant to reduce friction between the subfloor and joists. If the squeaks persist, you may need to consult a professional contractor for further assistance.
Either the garage door would need to be cut and adjusted in height to conform to the floor, or the floor would need to be modified to conform to the door. If the door bottom is near level, the floor should be built up to meet the door. If the floor is level, there are serious issues with the door. Consult a garage door installer.
Leveling should have been done on the floor and walls. By the time you get to the ridge you should be able to measure and get it level.
You can use a table or use one of the many software packages available. You need to know the area that the joists will support and have some idea of the weight of the contents that will be placed on the floor. IRC or IBC code books are available at the library.