INTERVENTION
REA SON
CONSIDERATION
Aids water run off to prevent ponding on timber surface Barrier applied to edges where timber absorbs water more readily Prevents moisture reaching edges at joints between components Prevents components contact with ground level moisture from pooling, splashing etc. Also from being buried in floor build-ups where moisture can be trapped. Ensures site staff understand and implement measures required to protect and remove water during construction Protects CLT surface from moisture ponding during construction (when floor slabs below roof level may be exposed) Aids quick detection of a leak in the whole building system that could damage the timber Aids quick detection of any water sources which could damage the timber in areas where this is of greater probability (eg bathrooms, concealed voids with piped services) Aids quick detection of timber moisture content to quickly identify and rectify issues Provides additional protection against contact with ground level moisture (including flooding) Aids quick detection of water sources which could damage the timber and ensures timber in high-risk areas is not part of primary structure Positions key source of water away from structural timber Positions services which could be a source of water away from structural timber Positions structural timber away from area prone to moisture ingress (roofing membrane failure etc.)
Roof to minimum 1:40 falls
End grain sealant applied post machining of panels
Taped joints
GF timber min. 150mm from FFL to external walls. Above FFL to internal walls
Construction phase moisture management strategy
Install membrane to top face of CLT floors
Cost
System leak detection (water mains pressure)
Cost / Maintenance
Localised moisture detectors near timber structure in high risk areas
Maintenance. Can be installed during fitout and owned by freeholder or Tennent.
Localised moisture detectors in timber
More onerous installation, management system and cost
Ground level concrete/steel podium
Exposed timber structure at ground level not possible
Change to lightweight timber frame in high risk areas
Location of high-risk areas limited and fixed
External down pipes or down pipes in concrete structure
Potentially visible downpipes
Only viable in large projects which necessitate core of different material Exposed timber soffit at upper level not possible
Services in higher durability zones
Alternative material to roof slabs
Primary mitigations. Must be applied on every project. Secondary mitigations. Project specific, dependant on building characteristics and risk profile. K E Y
DURABILITY
4 7
Made with FlippingBook - professional solution for displaying marketing and sales documents online