Is teak a good choice for a wooden internal staircase? What should be the thickness of the wooden planks?
Seasoned Indian teak wood (such as CP teak or Nagpur teak) is highly recommended for staircase treads (steps). For planks with side supports 1m wide, or less, the tread should be equal to or greater than 32mm or 1.25 inches. Alternatively, you could cut down the cost by using a 20mm-thick section on top of a rigid commercial board made of a 20mm thick commercial board or softwood sections of similar thickness. The top teak section and its moulded edge could be designed to hide the support.
Also note that thin, unsupported or unseasoned sections of wood have a tendency to warp or crack over a period of time and should be avoided.
What is the best way to remove stains from Egyptian marble flooring?
It is difficult to keep Egyptian (Omani/Afghani) marble free from picking up stains due to its naturally porous structure. A two-coat surface would have been a better option. Even grinding the floor won’t help remove the stains that have penetrated the depth of the slab. Some good options would include:
Pore filler: Ideally, you should start with a pore filler after the first grinding with a zero numbered stone.
Crack bond is a good product: It has a hardener as well as a resin. Mix it as per the ratio specified by the manufacturer and spread it over the surface with the help of a thin metal sheet. Alternate spreading and wiping off strokes, with consistent pressure on the metal sheet will create thin layers that stand a better chance of filling up the cracks and pin-head holes. Allow the surface to dry for 6-12 hours, depending on the moisture level in the air. Be careful while applying it, as splash stains are difficult to remove.
Surface sealers: These are applied after the granite polish has been completed. They help in retaining the polish for a longer period of time, as well as reducing the stone’s ability to pick up stains. Surface sealers come in two base mediums—water and oil. Water-based surface sealers are preferred over oil-based ones. The sealer is allowed to form a clear film over the stone for about 8-10 hours and then wiped clean with a dry cloth. Laticrete is a popular brand.