Of the three types of house foundations (slab, crawlspace, basement), full basements take the most time and work during construction. The construction of a full-height basement foundation can take two or three days. They consist of footings, a slab floor and reinforced vertical walls. The footings and slab are poured before the walls, mostly to make sure the concrete in these parts completely fills the formwork through the settling process. If wall, slab and footings are poured all at the same time, tamping equipment and mechanical vibration machinery are used to move the wet concrete into position.
Archives for April 2010
In home construction, three types of foundations are used, basement, crawlspace and slab on grade; all three involve formwork. Formwork is the term used to denote the molds that concrete is poured into to form walls, footings and slabs. Some footings are poured directly into excavated holes, but most formwork consists of lumber and stakes.
The refrigerant in an air conditioning system or air conditioner is transported to the different components in it through copper piping of small diameter called refrigerant lines. The line that carries liquid refrigerant from the condenser or receiver to a pressure reducing device is called the liquid line. Between the evaporator and the compressor inlet, the line is called the suction line.
Rebates are open sided grooves cut on the edge of a workpiece, as shown in the picture here. They are also known as rabbets. Depending on the size of the work, the woodworking technique for making the rebate varies.
Very small rebates are made using a side rebate plane tool. These have two blades, one on each edge, so that the tool can be used from right to left or left to right.
The tool allows you to trim both sides of a groove when working from only one end of the piece to accommodate the grain direction of the wood. It also includes a depth gauge which acts as a guide to maintain the base of the rebate at right angles to the wall surface.
Every home has a certain level of noise, and every occupant has their own comfort level of how much noise they can tolerate. Total silence can be disturbing for many people, so we don’t want to get rid of all noise, nor is it possible in most cases, but there are steps you can take to keep household noise to a reasonable level.
Tactics for noise control fall into two categories; stopping noise at its source, or stopping sound from being transmitted in your house from one location to another. We look first at stopping noise at the source.