These joints a rockin '...
Understanding movement
The first and important precondition for an expansion gap is the movement that allows. What does that mean? Movement is usually two species such as such as a unit of measurement (2 "") or a percentage (50%). Obviously with this callouts on the plan, you can calculate the other. For example, if a 4"joint needed 50% movement that does compress the common 2" and 2 "expand." This type of movement is out: ± 2 "." This legend is little interpretation.
There are some who argue that in the above example the ±2 would "Legend 4" gap is 100% movement. This is a + 2 "-2" movement, the you 4 "movement, equaling the joint width." This is not typical. With a 100% legend that is pretty standard, a common 4 would "compress 4" and extend 4-"total."
The most common or standard movements are 25%, 50% or 100%. So you have the option, a movement is better than the others? In terms of prices and options, Yes. For example, the structural engineer has determined 2 "Of the movement at a given location is required." We can this movement and design for a 2 "structure gap need 100% motion or a 4" gap with 50% movement. Either you give you these examples the two inches required movement. This is a pretty common example, but figure below the percentage of movement more options for joint covers; have to move with a higher percentage of movement complex systems that dramatically and with the cost of the system and the installation problems increase exponentially.
Reduction of fire barriers
This leads us to fire barrier systems, one of the most important, expensive and are mislabeled components of an expansion joint. There are two main types of fire barriers - like mineral wool covering a kind of insulation and fire. Each type has its place in the industry.
First mineral wool is inexpensive compared to the ceiling, and makes it relatively easy to get a higher fire rating. However, it can satisfy a hose stream test for vertical studded applications, at least not yet. Mineral wool also has a relatively small movement ability due to the fact that it must be very dense, because there is friction at your seat. These are meant for most applications only for thermal agitation. This binds back to movement - small movement means less effort for the fire barrier.
On the other hand, fire cover can be installed in almost any application, and you have movement better ability than mineral wool. Almost all fire cover are equipped with 50% movement. This option is required if you need large common wide or large moving. Pants are stream for studded walls is approved as the - start the tunnel fire barrier will not fall out, as it attached to studs is instead of friction losing your integrity - kept. The only major downside blanket over rock wool fire protection is the total price. Fire barrier should maintain therefore on a reasonable budget plans accurately be called out.
New systems - more options
The last decade heralded a new era of visually appealing systems better materials have replaced outdated, heavy, over-engineered joint covers. A major change was in expansion joint - mounting system and methods.
Many recessed mount systems (system needs a block-out in the table) no longer need concrete anchor. They were replaced by a simple expansion bolt hardware style. Popular seal systems have a long way in types of materials used, the seal form also come. A dual durometer seal is a great example of a major improvement - a hard material is used for the Barbedpart of the seal, which allows ", click" while a softer material, is used for the rest of the seal. This allows a larger movement in the seal.
Joints have been slow to the construction trend for cleaner, lighter, aesthetically pleasing products will follow. However, many new systems are now designed to hide the joint almost in its entirety. Many systems now use the surrounding surfaces in conjunction with the common system of extension to hide the common or mix your in the interior design.
Design tricks can save money.
Reduction of the visible part of the common path can be taken in the proper design of a building one step further. Expansion joints between walls along the path can simply be hidden but very careful with this approach, as fire codes in the game can come. "For example, hide a Chase wall can" "of the common joint there is still the need for an appropriate fire protection along... but how can an inspector determine proper materials and installation when these materials within the wall are?"
In certain cases, a finish can be used to cover an expansion joint. For example, the need for a common system can absorb some movement and reduce or eliminate a ceiling tile condition. This includes a 1/2 "-Dehnungsfuge not expected to finish much exercise a carpeting."
Watch out for accessories
Sometimes even with the best intentions and plans, the design and installation of building finish accessories the biggest problem foresee or overcome can. For example, something as simple as a door or window in the common path without the right design, a big problem can cause when you design the movement you.
It is also important to consider finish accessories and close to joints. Accessories include items such as countertops, cabinets, handrails, lockers and WC partitions. Well, maybe you think "Who in their right mind would mount over a joint a cabinet?" and that would be an honest answer. But I did it, and often ends the accessory move out from the wall as soon as movement is introduced.
Finally, if you take your favorite pain reliever to a lot to avoid would, it is important approach expansion joints and cover systems with the following mindsets:
> have a clear understanding and agreement on the movement designed and specified
> choose the corresponding fire and achieve the necessary assessment to save barrier system costs
> research new common systems and materials to find the best solution and avoid heavy, over-engineered products
> remember design and finish simple, can hide that tricks joints
> you avoid installing accessories in close proximity to the joints
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