SMART Visoglide Plus - Choosing the correct interlock section or meeting style
Choosing the correct interlock section or meeting style as it is also referred to, is an important consideration to make when specifying aluminium sliding doors. The interlock section has to be designed to withstand the wind loading upon the sliding door.
The wind load on a sliding door is a function of a number of factors:
Geographical location of the door, as this effects the design wind pressure
Location and exposure of the door in relation to its immediate surroundings, as this also effects the design wind pressure
Height of the door
Syle of door including the width of glass / spacing of meeting syles
In this article I am not going to discuss the first two factors above ie how to determine the design wind pressure, as this is covered elsewhere on the internet and is not specific to the SMART Visoglide Plus sliding door.
However I am going to cover the last two bullet points, and how the size and design of the sliding door influences the choice of meeting style for a given wind pressure.
SMART Visoglide Plus Meeting Styles
There are four different meeting style configurations for the SMART Visoglide Plus sliding door:
Slimline Interlock - 35mm Wide
Standard Interlock - 83mm Wide
Externally Reinforced Interlock - 83mm Wide
Fully Reinforced Interlock - 83mm Wide
Determining the correct meeting style
The type of meeting style to select depends upon the deflection of the meeting style under the wind pressure loading.
The maximum allowable defection is calculated by dividing the length of the meeting style by 200 (ie B/200). This has an upper limit of 15mm. From here the structural properties of the meeting style can be calculated (determing the Second Moment of Area required for a
given Young's Modulus of the material etc).
Fortunately we do not have to perform any of these calculations as the wind pressure loading vs the size of door have been calculated for us in the charts below:
Wind Pressure vs Sliding Door Size Charts for each Meeting Style
The permissible wind pressure loading vs door sizes charts are included below [click each chart to expand into new tab]:
Externally Reinforced Interlock
Fully Reinforced Interlock
NB The chart for the Slimline Interlock is not shown and is limited to a maximum height of 2100mm
Comparison of Different Meeting Syles
It is not always clear from the charts above how different the meeting styles compare with one another. In the table below we have compared the different meeting styles to see what the maximum height of door achievable is for a given width.
Wind Pressure=1000 Pa: 2 Pane Slding Door
|Overall Door W
Max H (mm)
Max H (mm)
Max H (mm)
From the table above it is clear that their is a significant difference in the capability of each interlock type.