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Ventilated air space requirements for suspended timber floors
5.13(c)NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
with a ventilated air space measuring at least 75 mm from the ground cover to the underside of any wall plates and at least 150 mm to the underside of the suspended timber floor (or insulation if prov
dwellingnon-domesticventilationaccessprotection-from-fallingOffset ventilators for level access
5.16NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
If floor levels need to be nearer to the ground to provide level access, subfloor ventilation can be provided through offset (periscope) ventilators.
accessaccessibilitydrainageDoor thresholds in external walls - weather protection guidance
6.33NI-wide·Technical Booklet C Site Preparation and Resistance to Contaminants and Moisture
Guidance on weather protection of accessible thresholds is given in – (a) BRE Good Building Guide 47 Level external thresholds: reducing moisture penetration and thermal bridging; and (b) The Statione
dwellingnon-domesticaccessaccessibilitymoisture