A timber frame gridshell for a historic orangery

A timber frame gridshell for a historic orangery
Photo source
carpenteroakandwoodland.com
Probably our most challenging project to date, this timber frame gridshell is the world’s first gridshell to support a frameless glass roof, and is a Wood Awards winner.

With an existing grade I listed structure of questionable structural integrity it was necessary to find a solution that limited the loads transferred to it at the same time as supporting the UK’s first framless glazed gridshell roof.

Gridshells, using green timber, are prone to movement fom the effects of differing slopes of grain in the lathe, and varying lengths between finger jointing.

A timber frame gridshell for a historic orangery

For this reason, most gridshells are allowed to ‘find their own form’ prior to covering. In this case, the demands of the glazing system made only exacting tolerances, and predictable movements acceptable.

The timber frame gridshell is constructed from four layers of alternating lathe, finger jointed to enable use of locally sourced small section green chestnut. 

A timber frame gridshell for a historic orangery

The requirement for the gridshell to support the frameless glazing meant that the usual method of construction which allows the gridshell to ‘find its own form’ and to be able to flex was inappropriate.

This timber frame grid needed to be predictable and rigid, while specially designed node clamps allowed for small amounts of settling in movement.

A further complication was that the design required the lathes to bend over tighter radii than they would naturally go. 

A timber frame gridshell for a historic orangery

 

Frame Design

• The roof had to be designed to sit within the confines of the existing listed structure

• Loading had to be transferred to the new foundation under the stone floor below not to the existing structure

• Whilst similar to a number of other structures we’ve previously completed Chiddingstone was unique in that it had to support a frameless glass roof

• The initial concept required the lathes to bend to radii far in excess of the accepted engineering tolerances, meaning that the risk of breakage was high

• To inform the design process we carried out numerous tests on the cable and clamping system and bending tolerances of the lathe, this provided the data that dictated the curvature of the roof. Excessive curvature was designed out wherever possible, but was unavoidable where the lathes interfaced with the ring beam

• Our designers worked in close collaboration with the glass manufacturers to develop a node that would clamp the chestnut lathe, the cabling and support the 12mm toughened glass panels, allowing the glazing to float over the frame while accommodating small amounts of movement of the lathes

A timber frame gridshell for a historic orangery

 

A timber frame gridshell for a historic orangery

600450 A timber frame gridshell for a historic orangery glassonweb.com

See more news about:

Others also read

New project, old client: Britplas bolsters mental health project pipeline
Britplas have been appointed to supply the windows and glazing package to Mersey Care NHS Foundation Trust’s new mental health facility in Southport, in the continuation of a relationship which started 12 years ago with the installation of the first ever Safevent windows.
Sapa's STII Door goes from strength to strength
The STII commercial door has been well received by the market and sales continue to grow across all sectors.
122 Leadenhall - 'The Cheesegrater'
Designed by Richard Rogers of Rogers Stirk Harbour + Partners, 122 Leadenhall has become an iconic part of the London skyline.
Astraseal offers customers the future of flush with new Alitherm 800
Well-respected trade and commercial fabricator Astraseal has created new, valuable opportunities for their customers nationwide with the launch of Alitherm 800, the brand-new aluminium flush casement from Smarts.
Aluminium fabricators due more choice & support | Window Ware
Find out how Window Ware is putting itself ‘in the frame’ to meet rising demand for aluminium door and window hardware with a growing product range and specialist knowledge.
Virtuoso launches first aluminium frame for composite doors
Virtuoso Doors has pulled off yet another first in the composite door arena with the announcement that its range of composite doors is now available in an aluminium outer frame from REAL Aluminium.

From industry

Polígono Industrial El Bayo, parcela I, 19
24492 Cubillos del Sil León
Spain

NEWS RELATED PRODUCTS

Thermoseal Group Ltd.
Thermoseal Group Ltd.
Trex Commercial Products

Add new comment