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GLULAM Laminated European Larch beams for Treetops

Treetops main support beams are constructed from European Larch which generally comes from Scandinavia, but can be sourced from similar climates / altitudes in parts of Austria / Germany

Specification summary for GLULAM and Larch as a material

  • 200mm x 100mm size chamfered to all edges finished with end grain preparation to prevent ingress of moisture, drilled and cut to specification.
  • Lams (laminate sections are 40mm thick)
  • All lam joints are overlapped
  • Any significant knots are drilled out and plug dowelled
  • All gluing is done under controlled conditions
  • Due diligence to prevent rotting of timbers for outdoor use untreated (designed in to the product itself)
    1. Galvanised steel shoes to prevent prolonged contact with the ground (*)
    2. Angled top profiles at pinnacles to prevent water standing on post tops (end grain treatment too)

In general terms GLULAM construction is:

  • A more effective use of material than standard sawn timber. It uses smaller sections of timber (which would normally be wasted). GLULAM uses less energy to produce the same volume / sections of timber.
  • Laminated timber is more dimensionally stable than whole log sections (no shakes or twisting/ warping)
  • The structural strength is comparable (or exceeds) the strength of steel structural beams by weight.

In general terms Larch is:

  • A superior density timber (slow growing, more rings per section)
  • Larch has natural anti fungal / insect resisting properties (resins/ natural chemistry of the timber itself)
  • Larch is well suited to the lamination process (GLULAM)
  • With due diligence (see * point 1 above) un treated Larch will perform well in outdoor applications without the need for harsh chemical treatments (CCB)

Environment Management Standards

PEFC (Programme of endorsement of Forest Certification)

FSC (Forestry Stewardship Council) certified.

Managing expectations

Treetops Mangrove Cable Way

Regarding the finish of untreated Larch:

This material changes colour over time from a pale brown / pinkish colour to a more brown / greyish tone by the action of UV over time. This is no detriment to the timber and is not a defect but a natural change over time. 

The nearest analogy is green oak which is often used as an untreated constructional timber which is exposed to the elements. This material also patinates to a similar hue over time.

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