As we previously mentioned, brick wall ties provide stability to structures that use cavity walls. When building a cavity wall,
you build two different walls and these are referred to in the construction industry as leaves. The inner wall is called the
internal leaf and the outer wall is called the outer leaf. Wall ties ensure that these walls are connected and act together as a
homogenous unit.
Frame Ties Galvanised
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Detailed Product Description
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Why is it important to use wall ties in cavity walls? As with all technology, especially within the construction industry, wall ties are now predominantly manufactured using stainless steel. The reasoning behind this is that stainless steel already has many protective elements, these include being able to withstand corrosion from commonly encountered elements such as water and cement. The key advantage to this is that the stainless steel does not require an extra layer of protection, so is cheaper to manufacture whilst also providing a maintenance free lifespan. Although most brick ties on the market are made from mild stainless steel, there are still some other brick ties available on themarket. One of the most commonly sold wall ties use composite materials and these help to create a thermal bridging between the walls. You will find these wall ties are the wall ties of choice in construction projects which aim to be ecological and low on energy consumption. How to install wall ties?The way in which brick wall ties are installed is obviously dependent on the dimensions and type of wall that you are constructing. For the purpose of this article, we are providing an insight into how to install brick wall ties in standard brick to block construction of cavity walls. As we mentioned previously, wall ties are built into the ‘leaves’ when constructing the walls to provide a coherent structure. A key rule when installing wall ties is to never install into a pre-built joint. Wall ties should always be pressed down with force and surrounded by fresh mortar in order to be effective in tying the walls (leaves) together. In order to prevent moisture from outside entering the wall cavity or reaching the inner leaf, there should be a slight fall from the inner leaf down to the outer leaf. This is also true for the drip part of the wall tie, which should always be pointing downward and be central in the cavity opening. However, not all wall ties are installed in this way as not all construction processes include both the inner leaf and outer leaf wall being constructed at the same time. Examples of construction projects like this include any whereby the inner leaf wall is constructed first and the wall ties are installed during the construction of the external leaf wall. Where should wall ties be placed?In order for wall ties to be as effective as possible and provide structure to cavity walls for long periods of time they must be installed at appropriate distances. The most obvious thing to consider when buying wall ties is to ensure that they have the length in order to span the whole cavity space with enough excess wall tie to cover the minimum embedment of the mortar on both wall sides. To provide an example, a 200mm long wall tie is the most appropriate for walls with cavity spaces from 50-75mm. Obviously, not all walls fit these measurements and walls with bigger cavities (very common in walls that include insulation) will require longer wall ties to account for the extra cavity space. Due to these requirements, you can typically buy wall ties ranging from 50mm to 450mm in length from local hardware and building merchants. As you would expect, there is red tape and regulations surrounding the installation of wall ties within cavity walls. The Eurocode 6 states that there should be 2.5 wall ties per square metre of wall. In most construction projects you will install wall ties in the same positions, at the same distances apart. Most construction workers typically installed at 900mm horizontal x 450mm vertical spacing. These will tend to be staggered across the cavity wall area to provide an even distribution and a more solid structure to the wall.    |
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