Moisture and vapour: design task for ground-bearing floors and screeds
Below a screed, moisture and vapour depends on full bearing, access routes and placement of the distribution layer.
In ground-bearing floors and screeds, moisture and vapour requires substrate evenness; also check design loads and the absence of point supports.
Moisture and vapour: inputs for ground-bearing floors and screeds
Before assessing moisture and vapour in ground-bearing floors and screeds, obtain moisture direction, barrier positions, sealant specification and every penetration detail.
For ground-bearing floors and screeds, 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 ground-bearing floors and screeds
In ground-bearing floors and screeds, 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 ground-bearing floors and screeds, address this specific risk: voids below panels.
Moisture and vapour: evidence for ground-bearing floors and screeds
For ground-bearing floors and screeds, 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 ground-bearing floors and screeds, 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 ground-bearing floors and screeds
The ground-bearing floors and screeds drawing develops moisture and vapour through two decisions: substrate preparation; then the load-distribution build-up and designated access routes.
For moisture and vapour in ground-bearing floors and screeds, dimensions and interface materials belong in the design, not in an improvised site decision.
Moisture and vapour: accepting work in ground-bearing floors and screeds
Acceptance of moisture and vapour in ground-bearing floors and screeds starts by matching delivery labels, drawings and the installed layout.
For moisture and vapour in ground-bearing floors and screeds, close the identified risk with a photograph, measurement or record, not a verbal explanation.
The final ground-bearing floors and screeds criterion for moisture and vapour is that moisture protection forms one continuous line through corners, supports and transitions.
Moisture and vapour: installation in ground-bearing floors and screeds
The installation rule for moisture and vapour in ground-bearing floors and screeds is to verify full-area bearing.
During ground-bearing floors and screeds work concerning moisture and vapour, inspect filled joints under raking light and record interfaces before covering.
Moisture and vapour: conclusion for ground-bearing floors and screeds
In ground-bearing floors and screeds, foam glass delivers its moisture and vapour benefit through a coordinated detail, not one schedule entry.
The ground-bearing floors and screeds workflow for moisture and vapour is to evidence the property, issue the detail, accept installation and retain concealed-work records.