Screed Construction

Screed is laid in three specific methods referred to as: bonded, unbonded and floating. Below are diagrams showing the various construction of the screed.

Bonded

Bonded screed is where a primer is used to adhere the screed to the existing base. The screed depth is generally 15mm+ thick

Unbonded

Unbonded screed is applied directly to the concrete base or DPM (damp proof membrane) at a depth of 50mm+ for traditional screed or at lower depths for modified screeds. The use of a DPM allows screed to be laid on to existing bases that are in a poor condition and another benefit is that it can reduce the drying time as it excludes the concrete base.

Floating

Floating screed is screed laid on top of insulation and insulation with underfloor heating.