B-CONSTRUCTION PHASE (MANUFACTURE, ASSEMBLY)
Manufacturing and transportation In this document, we assume the manufacturer uses proper protection during the production and transport of components and is responsible for delivering them in perfect condition. If not, the components will be returned for replacement. Storage and assembly The construction and logistics of constructing a timber building is the responsibility of the Contractor, but designers need to understand the risks during this phase and moisture should be a priority point on the agenda. As with all forms of construction, communication is key, and mistakes generally happen in between phases. A Design Responsibility Matrix should be produced to highlight responsibilities. The design team should establish a project specific Moisture Management Strategy prior to the involvement of the specialist subcontractor, this is a live document that sets out responsibilities and discusses design and mitigation measures to be implemented through-out the build phase of the project 10 . Mass timber components will be delivered to site with a low moisture content, generally around 12%, which allows for the timber to be immediately enclosed during construction without the need for allowing for drying out in situ. Unfortunately, most construction sites and programmes do not allow for immediate installation and enclosing of the timber from the elements and the material will likely need to be stored on site or be installed and left exposed for a time. This does not have to be a problem and with careful management and planning should have little impact on the timber. Once delivered, on-site wood-based materials and components must be fully protected from rain, snow and wet ground. If the timber needs to be stored on-site prior to installation, this should ideally only be for short periods of time, and they must be adequately protected from standing water and be ventilated to allow for drying, making sure any sheeting used for damp proofing Is breathable.
V I SUA L CHECK S
WE ATHE R PROTECTION
COV E R I NGS
VENTILATION
S TA B L E TEMPERATURE
DR Y I NG
Figure: Proper storage of timber during construction phase
DURABILITY
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