Drywall

If your local building code requires a fire resistant wall or ceiling, then 5/8" is mandatory. Otherwise you can at present use 1/2" or 3/8". Warning 3/8" seems to be going out of production. You can buy it now, but if you need to replace some of it in a few years it may be difficult to obtain; then you either have a step in the wall or replace the whole lot !

This is a joke right? Answer is - they're cheap!

I took my left over drywall and cut it into 12-15.5 inch sheets and glued it inside the wall (interior walls) between the studs I wanted to be more sound proof. I did it in the bathroom and my bedroom. Obviously you have to do it after one side is done and before you put the final sheets on the other side. You can do it to outside walls but you will limit insulation space and would have to glue it to the plywood or particle board.

The paper on the exterior of drywall made in 1977, or the spackling compounds use to bridge the space between two pieces of drywall, may contain asbestos, or it may not. The only way to know for sure is to have a sample collected by a person who is qualified to do that, and have it analyzed by a lab that is qualified and experienced in asbestos analysis.

You have several choices when repairing a mirror. You can try the Gorilla glue and put it at several places to make it secure. If that does not work you may have to make a new frame to hold it in place.

Anything above mid -fifties will work. Ideal is about 70 deg.

You would not use sandpaper. You would use a screen. The sanding screens usually come in an 80, 120, and 220 grit.

It depends where you buy it and what exact style of sheet. There are at least 12 different sheets in stores like Home Depot, and hundreds in drywall wholesale stores. A basic 4x8 1/2 inch is about $11 in my area.

It depends on how deep the water was. Normal answer is yes or you will have various nasty molds to deal with. Also the drywall will never be as strong.

There are different types of drywall. Green rock for wet areas in bathrooms. Exterior grade 'rock for porch ceilings. 5/8" X is used for garages. There could be endless floorplan variations which will affect how many lineal feet of wall space you have. You could have several different ceiling heights which will affect your material square footage. Your going to have to do the math on this one or take it to a professional.

Yes it is easily damaged in general.

Use a good mastic or adhesive

That depends how it's attached to the cement. eg, Is it on 'furring' or is it nailed directly onto the cement.

3.5 sheets to cover that.

To find a reliable drywall contractor try looking in your area by asking friends or asking people who are involved in the areas around drywall. With lots of asking you will surely be able to find a reliable drywall contractor.

Even if it's a small hole , you are calling out a tradesman to do a job. I have a 2 hour minimum regardless of how small the job is. How else could they account for driving to your house and back to the next job. -However, I will tell you how to do your own repairs. If it is truly small, less than postage stamp size, get a caulk gun, a tube of 'Alex ll' and a small plastic spatula. Caulk the Alex into the hole, then immediately smooth it over with the spatula. Now leave it 24 hours to dry and shrink, then give a second coat. this time be careful to leave no ridges or visible edges. After this dries use a good primer on it. - - If the hole is more than 3-4 inches, don't despair, we just use different stuff. In this case get a kit called 'Fibatape Crackstop' and a small bucket of drywall compound (both from Home Depot ) -The kit has full instructions and I don't need to repeat . This way you have the satisfaction of doing a job yourself AND saving 80-100 dollars.

The terms Exterior and drywall are not compatible. Drywall is used on the inside of the wall and is protected by a suitable weatherproof surface on the exterior of the wall framing such as lapboards, stucco, exterior sheathing etc. All of these have a moisture barrier behind them to prevent water/moist air from contacting the drywall. Drywall will disintigrate and allow mold/mildew and fungus to grow when moist. Eventually it will fail completely. So-called "green board" drywall is used in bathrooms and areas subjected to moisture but only outside the bath or shower area. It is not suitable for anything other than a backing material if used in the wet area of a bathroom. It can reside behind cement board or other materials with waterproof qualities. Never adhere tiles directly to green board unless it is outside the wet area of the bath/shower.

On Average the cost to install drywall in most major cities is roughly 3.00 per sqft. Of course this depends on the size of job. A simple way to cost out the price of a drywall job is to basically figure out how many sheets is required and base it per sheet complete at a cost of 100. that includes taping and finishing.

Because it is not a finished material until 2 or more parts are combined.

Either cut out a square to the center of each joist either side of the hole and replace the drywall with a new piece cut to size. then tape and mud the joints.

Also there are metallic screen patches made for small holes that stick to the existing drywall, and can be mudded over to fix the hole.

Cut drywall panels to size using a sharp utility knife. Install on the ceiling using as little panels as possible, reducing the number of joints. Use 6-Inch nails to attach the drywall panels to the joists.

One bucket will do for many sheets. It depends on how good the installers were and what tape you use. Mesh tape is better in my opinion,but does take more mud. - That's a small consideration for the better finish it will give.

everything including 5/8 drywall only requires 1 1/4 length drywall screws. you put them in 16 inches apart on the studs and in the center the same distance apart.

How big of a box? They are normally sold by weight.