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A stable subsctructure is the be-all and end-all of tree house construction (look at the guys in the image above – they would all fall down if there wasn’t a solid substructure). The task is:

  • to keep the platform in place
  • to distribute the load of the treehouse evenly to the individual fasteners
  • to the introduce the load as gently as possible into the tree trunk 

1. The triangular construction

Triangles are importent elements for treehouse construction.

The advantages:

  • Triangles are in themselves immovable and stiff
  • The platform can protrude far / to the side
  • The construction offers a lot of design freedom
  • Since the screws are located one below the other, fewer guide vessels are damaged
  • 3D substrctures can spport heavy loads and largest spans

Here’s what you should watch out for:

  • The more pointed the triangle (V-Bracket max. 60°), the more vertically the forces are transferred into the trunk – this is good because wood is much more stable along the grain.
  • The larger the triangle, the more susceptible it becomes to rotations around the trunk axis. Triangles with a width of 2 – 3.5 m and a screw spacing of 1.5 – 2.5 m have proved their worth

What is needed:

The difference between the triangular supports “V-Bracket” and “45°-Diamond Bracket”:

V-Bracket:

  • The angle of the V-Bracket is variable: at the bottom max 60° acute, i.e. struts go up with 30° each).
  • The V-Bracket consists of two independent parts which can also be used separately, thus giving you a lot of design freedom.

45°-Bracket:

  • The 45° bracket has a fixed angle of 90° at the bottom, i.e. the struts go up with 45° each.
  • Due to the raised rear wall, struts can also be attached to the front (3D constructions).
  • The 45° bracket can take larger loads.

2. Standard triangular construction with “V-Bracket” (2D)

The picture shows three situations that can occur during the assembly of a triangular construction:

a) shows the ideal position: the tree trunk is straight at the intended mounting point; the triangle can be fixed in the middle; the distance to the tree can be freely chosen.

b) shows in principle the same triangular construction, only that the trunk is slightly inclined backwards: thus the position of the supports on the screws is offset; this situation often occurs with inclined trees, with assembly at the trunk foot and with curvatures in the trunk.

c) illustrates the other extreme case – the tree is inclined sideways; it is always important to fasten the screws as centrally as possible in the tree trunk: the screw axis should point towards the trunk core; in this example the locating bearing is fastened off-centre on the upper crossbeam.

3. Advanced triangular construction with “V-Bracket” (2D)

The examples show further variants of the triangular construction with V-Bracket:

  • With the V-Bracket you have complete creative freedom
  • Ensure that the supports and screws are loaded as evenly, centrally and vertically as possible

a) shows a mixture of triangle construction that goes far out and is supported by an additional cable suspension

b) is similar to a) but for more light weight platform constructions

4. Professional substructure with “45°-Diamond-Bracket” (3D)

The 45°-Diamond Bracket is used for large platforms and heavy loads:

  • The side struts have a fixed angle of 45°
  • In addition to the lateral triangle, one mounts forward projecting beams (3D)
  • This allows the platform to protrude further and the loads are directed into the lower screw

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5. Triangle – Wooden Support – Combo

An excellent solution if you only have one tree: The combination of triangular construction and stilts

  • The platform should not be higher than 3 m to reduce the risk of buckling of the supports.
  • The higher the platform in the tree, the more movement in the wind, the greater the stress on the fasteners.
  • To reinforce the supports, diagonal braces / head straps / braces must be pulled in.
  • Wooden cross section support: > 10 x 10 cm
  • Wooden cross section struts: > 7 x 7 cm

6. More examples for substructure & platform construction

7. Supporting static elements

In the case of wide cantilevered platforms, long spans, spiral staircases or subsequent extensions, the platform may start to roll. Here there are two simple and effective measures:

Here you tension the sagging part of the platform with a rope upwards. Installation of the GTS Safety is child’s play; the rope is then tensioned using a turnbuckle. Since it is not a primary load-bearing rope, an inconspicuous black Dyneema rope is recommended instead of the steel rope.

If a rope suspension is not possible or if the course of the rope interferes, the platform should be struck from below. The wooden strut should not be screwed directly into the trunk (prevents tree growth + risk of fumigation due to waterlogging).

Both elements can easily be installed afterwards and combined as desired.

Do you have any questions?

If you have any further questions about the fixation of your treehouse, we will be happy to help you. In order to be able to advise you optimally, please send us:

  • a detailed a sketch of your building project
  • pictures of the trees
  • distance between trees
  • platform height
  • platform size
  • tree diameter at platform height
  • expected load situation

info@thetreehouse.shop

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