Weigh the cost of building versus the return on your investment in the balance and you may find a granny flat can offer a great return for years to come and can add value to your home should you decide to sell. *Cost and prices in this article are indicative and should only be used as a guide.
The needles are generally made of a heat-treatable stainless steel or carbon steel. To prevent corrosion, many are nickel plated. Depending on the style of device used, the main body of the tube can be made of plastic, glass, or both.
Nylon is made of repeating units linked by peptide bonds. Commercially, nylon polymer is made by reacting monomers which are either lactams, acid/amines or stoichiometric mixtures of diamines (-NH2) and diacids (-COOH). Mixtures of these can be polymerized together to make copolymers.