There are two types of joints: expansion and contraction. Contraction joints are usually installed with a jointing tool when the concrete is still fresh or with a concrete saw after the concrete gets hard. Expansion joints are preinstalled dividers such as black fiber, cork, or other physical barriers such as redwood strips.

This is a very common question with a very simple answer. To ensure your floor stays in place and has a long life free of damaged caused my extreme contraction and expansion, maintain the humidity in your house at a level between 45% and 55%. This is a simple and efficient step to increase the longevity of your floor. An added benefit of maintaining humidity is your personal comfort. See similar questions...

Thermal Expansion and Contraction - All materials expand and contract to a greater or lesser degree due to changes in temperature and humidity. Allowances must be made for these changes in the construction and fabrication of products; for example, the expansion joints in cement sidewalks and on steel bridges. Acrylic sheet is subject to greater dimensional change, due to thermal expansion and contraction, than other materials with which it is used in construction. Acrylic Sheet vs. See similar questions...

Yes! It is necessary to know the diameters to be connected and to define whether the pipes to be connected together have a socket or otherwise. See similar questions...

Unfortunately, most plumbing stores don't carry HDPE - often times the store employees have never even heard of it. Usually it can only be found at large industrial plumbing supply places. You can also purchased pre-cut, plugged pieces of HDPE pipe from Pyrogear.net, which specializes in making mortars for fireworks. See similar questions...

Definitive Sealing: by welding the Valsir sealing cover (art. 342). Non-definitive sealing: solution A: by welding the Valsir sealing cap (art. 340). Solution B: by welding the Valsir collar (art. 347) then, using the Valsir free flange (art. .45), the corresponding set of Valsir bolts (art. 341), the Valsir sealing gasket (art. 343) and the Valsir blind flange (art. 346). See similar questions...

We have expansion joints to accommodate expansion and contraction in the pipe work due to changes in temperature, whether it is ambient temperature or from the nature of the discharge through the pipe work. See similar questions...

Yes. We create an independent gutter lining (a gutter within a gutter) and always take thermal and structural movement into account during installation. See similar questions...

High Density Poly Ethene but most commonly known as Polythene. One of the most common plastics you use in daily life it has an oily-type finish. Some of the original Prototype Stunt Stormtrooper Helmets were made in HDPE as Andrew Ainsworth (the original maker of the helmets) had some of this plastic in stock as he was making Garden ware and Fishponds. It was a khaki-coloured plastic and due to its oily nature it was a bit of a struggle getting the white paint to stick to it. See similar questions...

Why not extend the pipe slightly, using a compression fitting with a special imperial size olive, enabling you to add a short length of metric piping? Then use a push fit end cap as usual. Alternatively, some engineers will adapt the outer end of their dump hose to fit onto one side of this removed radiator, with another adapted tube leading from the other side of the radiator to the drain. This way, every time you dump, you’re putting a good flow of water through the radiator. See similar questions...

HDPE is a translucent white colour in its initial state. A small quantity of carbon black is then added to protect the product from ultraviolet rays. The UNI EN 1519-1 standards at the heading: "Colour", establish that it shall be "preferably coloured black". See similar questions...

Often there is a disparity in the widths of the upper and lower jaw, the most common being where the upper jaw is narrow compared to the lower. When this happens, the upper teeth generally will not fit well with the lowers. The overt condition is known as "crossbite." Because this is a problem of the jaws, the muscles that attach between the upper and lower jaws are out of harmony as well; and, in fact, are a large part of the reason that the teeth do not fit well. See similar questions...

The evidence for an accelerating expansion comes from observations of the brightness of distant supernovae. We observe the redshift of a supernova which tells us by what the factor the Universe has expanded since the supernova exploded. This factor is (1+z), where z is the redshift. But in order to determine the expected brightness of the supernova, we need to know its distance now. See similar questions...

Any computer program which deals with dates is susceptible to this problem. Thus, if you use dates in any of your applications at home or work, you should make sure the applications you are using or the programs you are writing are compliant with 8 digit dates or have some other mechanism built in to deal with the year 2000. See similar questions...

PVC has an impressive record of long-term durability. When water utility managers and engineering firms were surveyed in a study sponsored by the American Water Works Association Research Foundation (AWWARF), they cited corrosion resistance, longevity and durability as their top reasons for choosing PVC. When these same water supply professionals were asked to rank PVC against the other common types of pressure pipes for life expectancy, PVC ranked first. [Source: Moser, A.P. See similar questions...

This question probably has as many answers as there are pipe smokers. Every smoker has to find the best method for them, but there are some good basic guidelines. The bowl should be packed gently in stages. The ideal fill is even and consistently dense from top to bottom. That's the idea behind the old saw, "Tamp the first pinch with the hand of a child, the second with the hand of a woman, and the final pinch with a manly touch." When done properly, a consistent fill is assured. See similar questions...

According to the UNI EN 1519-1 standards, HDPE utilised for waste systems must not be used under pressure, however the HDPE wall thickness, up to diameter 160 has the same wall thickness as the PN4 pressure range, whereas the remaining pipes correspond to the PN3, 2 range. This, naturally, also refers to the welded pipe, but without joints with: electric sleeves, extension sockets, expansion pieces and all the fittings that incorporate ring seals. See similar questions...

It is necessary to consult our technical catalogue while referring however to the correct name of the chemical agent and not to the common slang name (for example: BLEACH = SODIUM HYPOCHLORITE). See similar questions...

UNI EN 1519-1 standards indicate 95°C, whereas the softening point, namely the temperature which causes the piece to deform corresponds to 125°C. Therefore, even temperature peaks exceeding 95°C do not create problems. See similar questions...