Topcrete RD blocks are purpose designed dense blocks for the construction of solid separating walls in dwellings conforming to Robust Detail E-WM-9.
Topcrete RD working dimensions
Topcrete RD blocks are 440mm long x 215mm wide x 100mm high. They should be used laid flat to construct a 215mm width wall.

Topcrete RD quantities
The product is sold as a 215mm width block on a square metre basis (m²).
There are 20 blocks supplied per m² of wall.
Topcrete RD benefits
- Can be used in separating walls without the need to undertake routine pre-completion testingˆ
- Unique end grooves aid site identification.
- Quicker and cheaper to build than cavity separating walls.
- Strong enough for most low and high rise building requirements
ˆ Pre-completion testing not required provided building plots are pre-registered with Robust Details Ltd.
Topcrete RD environmental performance
Topcrete RD is manufactured under an ISO 14001 compliant Environmental Management System that is independently certified by BSI.
Topcrete RD specification
- Mean compressive strength: 7.3N/mm²
- Dry density: 1900 to 2000kg/m³
- Unit weight: 18.5 kg
- Laid weight excluding finishes: 416kg/m²
Unit and laid weights are approximate and calculated based on the specified dry density with 3% moisture content by volume added to provide equilibrium weights.
Topcrete RD is manufactured to comply with EN 771-3, tolerance category D1, and conforms to Category 1 manufacturing control as specified in BS 5628-1.

