Moisture and vapour: design task for accessible roofs
On an accessible roof, moisture and vapour must be linked to foot traffic, equipment and load distribution.
In accessible roofs, moisture and vapour requires the relationship between insulation; also check the load-distribution layer and the wearing surface.
Moisture and vapour: inputs for accessible roofs
Before assessing moisture and vapour in accessible roofs, obtain moisture direction, barrier positions, sealant specification and every penetration detail.
For accessible roofs, the verifiable moisture and vapour requirement is to verify joints, interfaces, penetrations and the compatibility of sealing materials separately.
Moisture and vapour: application boundary in accessible roofs
In accessible roofs, moisture and vapour has an important boundary. Low vapour permeability cannot correct an unfilled joint or a break in external waterproofing.
For moisture and vapour in accessible roofs, address this specific risk: concentrated loads reaching an unprotected surface or errors at movement joints.
Moisture and vapour: evidence for accessible roofs
For accessible roofs, the moisture and vapour source states: The D130 technical data sheet states a water-vapour permeability of no more than 0.003 mg/(m·h·Pa).
For moisture and vapour in accessible roofs, apply this principle. Moisture protection depends on system continuity: product properties cannot compensate for open joints or a defect in an adjoining layer.
Moisture and vapour: detailing for accessible roofs
The accessible roofs drawing develops moisture and vapour through two decisions: design loads; then the load-distribution layer and interfaces with movement joints.
For moisture and vapour in accessible roofs, dimensions and interface materials belong in the design, not in an improvised site decision.
Moisture and vapour: accepting work in accessible roofs
Acceptance of moisture and vapour in accessible roofs starts by matching delivery labels, drawings and the installed layout.
For moisture and vapour in accessible roofs, close the identified risk with a photograph, measurement or record, not a verbal explanation.
The final accessible roofs criterion for moisture and vapour is that moisture protection forms one continuous line through corners, supports and transitions.
Moisture and vapour: installation in accessible roofs
The installation rule for moisture and vapour in accessible roofs is to avoid impact.
During accessible roofs work concerning moisture and vapour, inspect filled joints under raking light and record interfaces before covering.
Moisture and vapour: conclusion for accessible roofs
In accessible roofs, foam glass delivers its moisture and vapour benefit through a coordinated detail, not one schedule entry.
The accessible roofs workflow for moisture and vapour is to evidence the property, issue the detail, accept installation and retain concealed-work records.