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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.
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How do you raise the floor on a concrete slab?
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.
Why do the tops of 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. 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.
What is thickness of sub floor needed?
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.
What size of joists do you need for span 19' on 2''x6'' wall support only a floor above no roof on top?
2 x 12.
Do I need a special floor in my home for aerobic equipment?
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.
How do you fix a 9 inch gap under your garage door?
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.
Do you need a lvl for ridge pole in a 25 foot span?
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.
How do you calculate the floor joist sizes?
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.
What is the cost to replace a rim joist?
In a typical home, the surface flooring (such as wood, carpet or vinyl) rests on a subfloor, which rests on joists -- a series of closely spaced parallel beams that support the floor or ceiling loads. Joists are usually supported by a sill (a long horizontal timber that's the lowest part of the framework and rests on the foundation) or a girder (a large beam that's the main support of the building). When replacing rotted floor joists it's important to be sure the girder and sill are still intact.Typical costs:If only a few joists are rotted primarily at the bottom, they can be repaired using a process known as "sistering" -- after the rot is cleaned away and the timber treated to prevent more problems, a new joist is laid beside the old one and fastened to it. Total costs will depend on the extent of the damage and the ease of access to the joists (through a basement or crawlspace), but in general sistering averages $100 -$300 or more per joist, and could run $1,000 -$3,000or more to repair a tilted, wavy or bouncy floor under an average room.If the floor joists are extensively damaged, it will be necessary to support the house with jacks while the joists are removed and replaced. In many cases, the sill may also be rotted and need replacing. Costs can run $10,000 -$30,000 or more for a typical home, depending on its size, the extent of the extent of the damage and the ease of access to install jacks and replace the timbers. If the damage is limited to just one section of floor joists, the project could run $5,000-$10,000.What should be included:Joists carry the weight of walls, furniture, people, appliances and anything else placed on the flooring they support. Usually wooden floor joists are 2"x8", 2"x10" or 2"x12" timbers -- their size depends on their length, the amount of "load" they're designed to carry and the building codes in effect when the house was constructed. The Family Handyman explains how joists work.If there is sufficient access through a basement or crawlspace, floor joists can be repaired or replaced without significant impact on the rest of the house. However, if there is limited access, all furniture and appliances must be removed from the affected area and the flooring and subfloor torn out. The Family Handyman explains how to "sister" damaged joists and HammerZone.com describes using a jack to raise a slightly sagging floor.Additional costs:Floor joists can be damaged by boring insects such as termites or extended exposure to water. Before you replace damaged floor joists, you must exterminate the insects or improve the drainage and ventilation so the problem won't reoccur. Costs will vary widely depending on the extent and nature of the original problem.Typically floor joists are repaired or replaced working from below, in a basement or crawl space. But if there's limited access to the joists, it may be necessary to work from above, removing the flooring and subflooring to repair or replace any damaged floor joists. Costs will depend on the extent of the damage and the type of replacement subflooring and flooring chosen.
When do you need bridging in a floor?
Bridging is always a good idea. I did a little construction work a long time ago, and we always used thin metal strips between the joists in new construction instead of wooden bridge work. Here's a picture of metal bridging between joists. In this picture they have bridging every third of the way, or every 4' on a 12' floor. http://www.rd.com/familyhandyman/content/34459?trkid=tfhplus_november_07
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.
How to anchor a pony wall on a sub-floor?
Obviously the problem with pony walls or half walls is that the have a huge tendency flex or move. Treat the wall like you would a railing on a deck or set of stairs. There needs to be a very strong base to anchor to. You can have a solid steel wall but the floor will allow it to move. If you cannot find floor joists to anchor to, you need to create a one. For me there is no other way. If there is access from below like a basement that's great. If on the second floor you need to open up the floor and expose the joists and sister 2X6 or greater on the joists or make a header spanning between them( do this every 2-3 feet for the length of the wall). Now you will have a strong base to anchor to. Another trick I learned from a welder is to have 3" angle iron welded at 90 degrees. For a short wall like 4' two will do. Bolt them to the floor with lag bolts, min 3.5" (into the solid base you made or joists) Build your wall around the iron and carriage bolt the frame to the metal. You will have a far superior wall that will barley budge. When building the wall also use large screws. 3" or better. Nails will back out of the studs very easy when pressure is applied. Screws won't.
