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Thin Concrete Walls: less than 8cm thick

In this sub-section of our concrete walls chapter, we offer information on successfully installing wire trellises into thin, concrete surfaces (specifically, those under 8cm thick.) You will deal with such walls usually in pre-fabricated garages, partition walls of community high-rise balconies, garden walls, and European rubbish cubicles. The outer shells of pre-fabricated buildings, especially in East Germany, are discussed separately under Weather Shells (double-wall masonry).

Properties of Thin Concrete Walls

The main feature of these structures is that they are almost never recognisable as concrete. For example, with pre-fabricated garages, the very smooth concrete walls are often painted with a granular, neutral colour, to give the effect of having been plastered. Alternatively, the walls can also be made of dyed material, painted in strong colours, stoned, or tiled. This is often referred to as 'lightweight concrete' (see below). Be sure to correctly identify the material of your wall surface before attaching the trellis. Weather shells for pre-fabricated buildings are much less resilient and are therefore discussed separately.

Securing of Trellis Ropes

For a wall thickness of 8cm and above, our easy and medium construction "eco" kits are recommended. For thinner walls, our light design, paired with any standard kit, is suitable.

When a wall's thickness drops below 7cm, there is a risk of drilling right through the wall; anything less than 6cm and any rawplugs you choose to insert will protrude, but this can be easily remedied by either trimming the plug so it lies flush with the wall, or replacing it altogether with our small holders-- WM 06093 secured with composite mortar.

 

For heavier plant loads, we recommend our medium construction "classic” kits, but in conjunction with the cross support WM 10081, which includes a brass rawl plug that will provide extra support. Please include a note in your oder stating any specific requirements. 

 

Due to the shallow drilling depth of only 3.5cm, hitting rebar is very unlikely. In lightweight concrete with lower tensile strength, the cross support WM 10101 is cemented at a depth of about 6cm. In exceptional cases, if a significantly wide gap is needed between the trellis and wall, for example, one of our heavier construction brackets can be used- such as the standard bracket WM 12191 which penetrates the whole wall and is fastened on the other side (see variant 03), or WM 12227 modified as WM 12167 with brass plug. To reduce strain, use 3mm wire rope and when drilling: the hole's diameter should be gradually increased, i.e., in the sequence 6/8/10mm. Please note our tips for drilling holes in concrete!

 

Steel cables in light construction (WM 06093) on a prefab. garage
Steel cables in light construction (WM 06093) on a prefab. garage
Vine trellis on a thin-walled concrete garage, cross holder WM 10081.
Vine trellis on a thin-walled concrete garage, cross holder WM 10081.
Garage with cross holder WM 12227 (mod.WM 12167), grapevines
Garage with cross holder WM 12227 (mod. WM 12167), Grapevines
Simple cable trellis system on a concrete fence, WM 06030 with brass anchor, grapevine
Simple cable trellis system on a concrete fence
Exceptional case: massive construction on pebbled pre-cast concrete products, gymnasium around 1980, evergreen honeysuckle & rose. The anchor-fittings protrude into the insulation behind this weather shell.
Massive construction on pebbled pre-cast concrete
Wire ropes for greening rubbish containers, cross mount glued to short-shaft WM 10101 in thin-walled concrete
Wire ropes for the greening of rubbish containers, cross mount glued to short-shaft WM 10101 in thin-walled concrete
Heavy construction, 8 cm concrete garage, through-hole PCB mounting with WM 12191 and counter-set, for facade greening with wisteria
Heavy construction for wisteria
WBS-70 pre-fabricated buildings (old East Germany) with protective weather shell (approx. 5-6 cm thick) and embedded tile, akebia on wire ropes
WBS-70 pre-fab buildings