Dimensional stability: design task for flat roofs
In a flat-roof build-up, dimensional stability starts at falls and penetrations and ends with acceptance of concealed layers.
In flat roofs, dimensional stability requires load distribution; also check drainage and interfaces at parapets and penetrations.
Dimensional stability: application boundary in flat roofs
In flat roofs, dimensional stability has an important boundary. Product stability does not cancel movement in the substrate, supports or structural joints.
For dimensional stability in flat roofs, address this specific risk: standing water.
Dimensional stability: evidence for flat roofs
For flat roofs, the dimensional stability source states: D130 dimensional stability is stated as no more than 0.2%, with a coefficient of thermal expansion of 8×10⁻⁶ 1/°C.
For dimensional stability in flat roofs, apply this principle. Stability is achieved only with correct bearing, properly detailed joints and no unintended bending action.
Dimensional stability: detailing for flat roofs
The flat roofs drawing develops dimensional stability through two decisions: falls; then layer order.
For dimensional stability in flat roofs, dimensions and interface materials belong in the design, not in an improvised site decision.
Dimensional stability: inputs for flat roofs
Before assessing dimensional stability in flat roofs, obtain thermal movement, settlement, the movement-joint map and substrate tolerances.
For flat roofs, the verifiable dimensional stability requirement is to coordinate substrate movement joints, thermal movement and the insulation layout.
Dimensional stability: installation in flat roofs
The installation rule for dimensional stability in flat roofs is to work on a dry substrate.
During flat roofs work concerning dimensional stability, never bridge a designed movement break unless a dedicated detail permits it.
Dimensional stability: accepting work in flat roofs
Acceptance of dimensional stability in flat roofs starts by matching delivery labels, drawings and the installed layout.
For dimensional stability in flat roofs, close the identified risk with a photograph, measurement or record, not a verbal explanation.
The final flat roofs criterion for dimensional stability is that the foam-glass layout accommodates structural movement without restraint.
Dimensional stability: conclusion for flat roofs
In flat roofs, foam glass delivers its dimensional stability benefit through a coordinated detail, not one schedule entry.
The flat roofs workflow for dimensional stability is to evidence the property, issue the detail, accept installation and retain concealed-work records.