Sustainable Construction

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Specification for Sustainable Construction

  • Foundations
  • Superstructure
  • Insulation
  • Cladding
  • Roof Construction
  • U Values
  • Joinery
  • pressure Testing

Sustainable Construction of Timber Buildings

Technical Information

Design and construction of our timber buildings is fully sustainable. The Sectional drawings are largely self explanatory and can be accessed by registering for our Technical Library.


Our buildings can sit on a variety of foundations, depending on site requirements.  Where minimal site disruption is required, we can also offer galvanised steel “screw piles”. This provides fast installation, minimal disruption and accuracy of both line and level.

All buildings – unless starting from a concrete slab – are supported on a heavy baseframe constructed of preservative treated (Tanalith “E”) glue laminated timber.

This baseframe forms the floor “cassette”, within which solid board insulation is fitted – between infil joists, before being decked with 22mm Finnish Spruce structural grade T & G plywood.


The “superstructure” is a structural shell of machine profiled interlocking log sourced from sustainably yielded Baltic Pine.  Minimum thickness is 75mm. This acts very much as a monocoque and includes all internal walls too.

MPL – (Machine Profiled Log) construction means that ALL components for the structural shell are manufactured off site to factory tolerances, ensuring an accurate FAST build.  The attached PDF shows the build sequence for a simple 120sqm building in just 23 days.  little acorns dated


The exterior of the structural shell is clad with insulants (normally 125mm solid board), wrapped with breather membrane and finished with very durable cladding.


Siberian Larch T & G to give a clean contemporary look. Siberian Larch does not require preservative treatment as it is naturally weather resilient.  Alternative claddings can be provided where required. Link below gives details on the qualities of larch as a choice of cladding.

Roof Construction

Roof construction varies, but generally comprises of truss rafters or scissor trusses to give a modest vaulted effect, or traditional rafter and purlin. In all cases we construct a “warm roof” by forming an OSB or plywood deck over the rafters upon which is laid solid board insulation, breather membrane, counter battens (to form an air gap), standard battens and finally the clients roof covering of choice. Metrotile being the most popular, but alternatives include slate, tiles, cedar & sedum.

U Values

Minimum “u” values based on 125mm solid board insulation are;

0.17 for the floor (depending on floor covering)

0.16 for the walls

0.16 for the roof – could improve depending on roof type.

By increasing the insulation to 150mm, we can improve all u values to 0.14


Joinery is all supplied pre-hung, pre-finished unless specifically requested otherwise.

All doors Part M compliant.

All windows are fitted with laminated glass and multipoint locking systems. Standard “u” value is 1.4, but we can supply down to 1.0 (assessed for the WHOLE UNIT – many manufacturers quoting this figure refer to the glazing cassette only).

Standard Glazing is 4/18/4, but we do offer a comprehensive range of options including acoustic glazing, triple glazing etc.

Air Pressure Testing

Sustainable construction of our buildings meets all current LABC requirements, including air pressure testing and can be further specified to comply with BB93 (Accoustic Design of Schools) BB100 (Design for Fire Safety in Schools), BB191 etc.

Cabinco holds both FSC and PEFC Chain of Custody Certification and can offer certification where this is requested at the time of order (in line with CATG audit requirements).

Learn more about sustainable construction of our timber buildings and contact us to discuss your project.