Fibre-reinforced render systems

SikaRenderEM Fibre is a polymer-modified, fibre-reinforced render incorporating alkali-resistant (AR) glass fibres dispersed through the render matrix. The AR glass fibres provide a secondary crack-arresting mechanism — if a shrinkage crack initiates in the render, the fibres bridge the crack and limit its propagation and width, resulting in a finer crack pattern with reduced water ingress risk compared to unreinforced renders. In Australian Class 2 strata facade remediation, fibre-reinforced render is specified where the underlying substrate has a history of render cracking — either from thermal movement, carbonation-induced render debonding, or structural micro-movement — and where a standard polymer-modified render is considered insufficient to resist crack recurrence. The fibre content (nominally ≥0.9 kg/m² equivalent in fibre volume) provides a statistically distributed reinforcement through the render cross-section that conventional polymer modification alone cannot replicate. Confirm current product name, fibre content specification, and application method with Sika Australia before specifying.

Mapei Planitop Fast 330 is a rapid-setting, polymer-modified, fibre-reinforced repair mortar in the Mapei Planitop range. The incorporated fibre reinforcement provides improved crack resistance during application and cure, and the rapid-setting chemistry allows overcoating in shorter intervals — valuable on strata facade repair projects where access periods are limited and faster return to service is required. In Australian Class 2 strata remediation, Planitop Fast 330 is used where fibre-reinforced render performance is required but the standard Planitop XS formulation is specified without fibre — contractors select the Fast 330 variant where project scheduling requires faster overcoating. The fibre reinforcement reduces plastic shrinkage cracking during the initial cure period, which is particularly valuable in hot, dry, or windy conditions common to Australian coastal strata sites. Confirm current product name, rapid-set working time, and fibre content with Mapei Australia before specifying.

Fosroc Renderoc LA is a lightweight, fibre-reinforced, polymer-modified render mortar in the Renderoc range, formulated with lightweight aggregate for improved sag resistance in overhead and soffit applications. The lightweight aggregate reduces the dead weight of the render coat, reducing the risk of sagging on vertical and overhead surfaces during application before the mortar achieves initial set. The incorporated fibre reinforcement reduces plastic shrinkage cracking and improves crack resistance in the cured render. In Australian Class 2 strata facade remediation, Renderoc LA is specified for soffits, fascias, and overhead beam surfaces where a standard render mortar would be prone to sag during application. The combination of lightweight aggregate and fibre reinforcement makes it particularly suitable for overhead render reinstatement on balcony soffits and underside spandrel beams where render replacement is commonly required as part of a balcony remediation scope. Confirm current product name and lightweight aggregate specification with Fosroc Australia before specifying.